dri-devel January 2020

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[drm/ttm] Memory corruption problem when ttm_tt_init() fails.
by Tetsuo Handa 29 Jul '20

29 Jul '20

I'm doing memory allocation failure injection test using 3.19-rc5 and it seems to me that there is a memory corruption bug in ttm or vmwgfx code. ---------- Crash pattern 1 start ---------- [ 80.751971] [TTM] Failed allocating page table [ 83.000393] BUG: unable to handle kernel NULL pointer dereference at (null) [ 83.004392] IP: [<ffffffff811b65a9>] __fput+0x39/0x1e0 [ 83.006944] PGD 7acd2067 PUD 7b0c7067 PMD 0 [ 83.009240] Oops: 0000 [#1] SMP [ 83.010940] Modules … [View More]linked in: stap_fault_injection(OE) ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_mangle ip6table_raw ip6table_filter ip6_tables iptable_mangle iptable_raw iptable_filter ip_tables coretemp crct10dif_pclmul crc32_pclmul crc32c_intel dm_mirror ghash_clmulni_intel dm_region_hash aesni_intel dm_log glue_helper dm_mod lrw gf128mul ablk_helper cryptd ppdev vmw_balloon microcode serio_raw pcspkr parport_pc shpchp parport vmw_vmci i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc uinput sd_mod ata_generic pata_acpi mptspi scsi_transport_spi mptscsih ata_piix e1000 mptbase libata floppy [ 83.038033] CPU: 2 PID: 8795 Comm: sh Tainted: G W OE 3.19.0-rc5+ #28 [ 83.039666] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 [ 83.042110] task: ffff88007a220000 ti: ffff880052048000 task.ti: ffff880052048000 [ 83.043865] RIP: 0010:[<ffffffff811b65a9>] [<ffffffff811b65a9>] __fput+0x39/0x1e0 [ 83.045665] RSP: 0018:ffff88005204bea8 EFLAGS: 00010297 [ 83.046895] RAX: 0000000000000000 RBX: ffff88007aff3500 RCX: 0000000000000a0a [ 83.048595] RDX: 000000000002801d RSI: 000000000000000a RDI: ffff88007aff3500 [ 83.050254] RBP: ffff88005204bee8 R08: ffff88007cbfd000 R09: 0000000180080006 [ 83.051848] R10: 0000000000000000 R11: ffffea0001f2fe00 R12: ffffffff81e6c040 [ 83.053515] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 83.055156] FS: 0000000000000000(0000) GS:ffff88007fc80000(0000) knlGS:0000000000000000 [ 83.057000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 83.058328] CR2: 0000000000000000 CR3: 000000007b0bc000 CR4: 00000000000407e0 [ 83.060004] Stack: [ 83.060482] ffff88007af0de48 ffff88007af0dc00 ffff88007af0de48 0000000000000000 [ 83.062285] ffffffff81e6c040 ffff88007a220610 ffff88007a220000 0000000000000000 [ 83.064115] ffff88005204bef8 ffffffff811b679e ffff88005204bf28 ffffffff81088f6f [ 83.065956] Call Trace: [ 83.066544] [<ffffffff811b679e>] ____fput+0xe/0x10 [ 83.067738] [<ffffffff81088f6f>] task_work_run+0xaf/0xf0 [ 83.068971] [<ffffffff81013c5a>] do_notify_resume+0x7a/0x90 [ 83.070307] [<ffffffff816a6d87>] int_signal+0x12/0x17 [ 83.071464] Code: 55 41 54 53 48 89 fb 48 83 ec 18 4c 8b 7f 18 4c 8b 77 10 4c 8b 6f 20 e8 06 c7 4e 00 8b 53 44 4c 8b 53 20 89 d0 83 e0 02 83 f8 01 <41> 0f b7 02 45 19 e4 41 83 e4 08 41 83 c4 08 44 89 e1 66 25 00 [ 83.077450] RIP [<ffffffff811b65a9>] __fput+0x39/0x1e0 [ 83.078729] RSP <ffff88005204bea8> [ 83.079522] CR2: 0000000000000000 crash> bt -l PID: 8795 TASK: ffff88007a220000 CPU: 2 COMMAND: "sh" #0 [ffff88005204ba70] machine_kexec at ffffffff8104ef62 /usr/src/linux/arch/x86/kernel/machine_kexec_64.c: 320 #1 [ffff88005204bac0] crash_kexec at ffffffff810ed983 /usr/src/linux/kernel/kexec.c: 1482 #2 [ffff88005204bb90] oops_end at ffffffff810176e8 /usr/src/linux/arch/x86/kernel/dumpstack.c: 231 #3 [ffff88005204bbc0] no_context at ffffffff8169af1f /usr/src/linux/arch/x86/mm/fault.c: 724 #4 [ffff88005204bc20] __bad_area_nosemaphore at ffffffff8169aff6 /usr/src/linux/arch/x86/mm/fault.c: 804 #5 [ffff88005204bc70] bad_area at ffffffff8169b31f /usr/src/linux/arch/x86/mm/fault.c: 833 #6 [ffff88005204bca0] __do_page_fault at ffffffff81059b37 /usr/src/linux/arch/x86/mm/fault.c: 1213 #7 [ffff88005204bdc0] do_page_fault at ffffffff81059c11 /usr/src/linux/arch/x86/mm/fault.c: 1295 #8 [ffff88005204bdf0] page_fault at ffffffff816a8a28 /usr/src/linux/arch/x86/kernel/entry_64.S: 1283 [exception RIP: __fput+57] RIP: ffffffff811b65a9 RSP: ffff88005204bea8 RFLAGS: 00010297 RAX: 0000000000000000 RBX: ffff88007aff3500 RCX: 0000000000000a0a RDX: 000000000002801d RSI: 000000000000000a RDI: ffff88007aff3500 RBP: ffff88005204bee8 R8: ffff88007cbfd000 R9: 0000000180080006 R10: 0000000000000000 R11: ffffea0001f2fe00 R12: ffffffff81e6c040 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #9 [ffff88005204bef0] ____fput at ffffffff811b679e /usr/src/linux/fs/file_table.c: 245 #10 [ffff88005204bf00] task_work_run at ffffffff81088f6f /usr/src/linux/kernel/task_work.c: 125 #11 [ffff88005204bf30] do_notify_resume at ffffffff81013c5a /usr/src/linux/include/linux/tracehook.h: 190 #12 [ffff88005204bf50] int_signal at ffffffff816a6d87 /usr/src/linux/arch/x86/kernel/entry_64.S: 587 RIP: 00007f1361d5f420 RSP: 00007fff77be5740 RFLAGS: 00000200 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R8: 0000000000000000 R9: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ORIG_RAX: 000000000000003b CS: 0033 SS: 002b WARNING: possibly bogus exception frame ---------- Crash pattern 1 end ---------- ---------- Crash pattern 2 start ---------- [ 227.647021] [TTM] Failed allocating page table [ 227.875795] BUG: unable to handle kernel NULL pointer dereference at (null) [ 227.877714] IP: [<ffffffff81594c57>] skb_queue_tail+0x37/0x60 [ 227.879107] PGD 78adc067 PUD 78ada067 PMD 0 [ 227.880186] Oops: 0002 [#1] SMP [ 227.881017] Modules linked in: stap_fault_injection(OE) ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_mangle ip6table_raw ip6table_filter ip6_tables iptable_mangle iptable_raw iptable_filter ip_tables coretemp crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel dm_mirror aesni_intel dm_region_hash dm_log glue_helper dm_mod lrw gf128mul ablk_helper cryptd ppdev vmw_balloon microcode parport_pc serio_raw pcspkr parport vmw_vmci shpchp i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc uinput ata_generic pata_acpi sd_mod ata_piix libata mptspi scsi_transport_spi e1000 mptscsih mptbase floppy [ 227.898988] CPU: 2 PID: 610 Comm: Xorg Tainted: G W OE 3.19.0-rc5+ #28 [ 227.900691] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 [ 227.903162] task: ffff8800788c6040 ti: ffff8800792d8000 task.ti: ffff8800792d8000 [ 227.904884] RIP: 0010:[<ffffffff81594c57>] [<ffffffff81594c57>] skb_queue_tail+0x37/0x60 [ 227.906816] RSP: 0018:ffff8800792dbbc8 EFLAGS: 00010046 [ 227.908056] RAX: 0000000000000292 RBX: ffff88007cbc6d10 RCX: 0000000000000000 [ 227.909718] RDX: 0000000000000000 RSI: 0000000000000292 RDI: ffff88007cbc6d24 [ 227.911376] RBP: ffff8800792dbbe8 R08: 0000000000000292 R09: 0180000002800000 [ 227.913027] R10: 0000000700020008 R11: 0000000000000000 R12: ffff88007b65aa00 [ 227.914690] R13: ffff88007cbc6d24 R14: 0000000000000000 R15: ffff88007cbc6c80 [ 227.916356] FS: 00007f3d07740980(0000) GS:ffff88007fc80000(0000) knlGS:0000000000000000 [ 227.918232] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 227.919559] CR2: 0000000000000000 CR3: 0000000078add000 CR4: 00000000000407e0 [ 227.921261] Stack: [ 227.921744] 0000000000000078 ffff88007b65aa00 0000000000000078 0000000000000000 [ 227.923618] ffff8800792dbca8 ffffffff816491bd ffff88007cbc6d10 ffff8800792dbd10 [ 227.925427] 0000007800000000 ffff8800792dbcc8 0000000000000078 ffff88007cbc6f78 [ 227.927271] Call Trace: [ 227.927872] [<ffffffff816491bd>] unix_stream_sendmsg+0x1dd/0x430 [ 227.929301] [<ffffffff8158c0c3>] sock_aio_write+0x103/0x140 [ 227.930638] [<ffffffff811b42ec>] do_sync_readv_writev+0x4c/0x80 [ 227.932047] [<ffffffff811b5c95>] do_readv_writev+0x1e5/0x280 [ 227.933406] [<ffffffff8101fe4b>] ? __restore_xstate_sig+0x8b/0x680 [ 227.934865] [<ffffffff81104424>] ? __audit_syscall_entry+0xb4/0x110 [ 227.936371] [<ffffffff811b5db9>] vfs_writev+0x39/0x50 [ 227.937565] [<ffffffff811b5eea>] SyS_writev+0x4a/0xd0 [ 227.938777] [<ffffffff816a6d6c>] ? int_check_syscall_exit_work+0x34/0x3d [ 227.940364] [<ffffffff816a6ae9>] system_call_fastpath+0x12/0x17 [ 227.941775] Code: 8d 6f 14 41 54 49 89 f4 53 48 89 fb 4c 89 ef 48 83 ec 08 e8 dc 1a 11 00 48 8b 53 08 49 89 1c 24 4c 89 ef 48 89 c6 49 89 54 24 08 <4c> 89 22 83 43 10 01 4c 89 63 08 e8 09 17 11 00 48 83 c4 08 5b [ 227.947880] RIP [<ffffffff81594c57>] skb_queue_tail+0x37/0x60 [ 227.949297] RSP <ffff8800792dbbc8> [ 227.950112] CR2: 0000000000000000 crash> bt -l PID: 610 TASK: ffff8800788c6040 CPU: 2 COMMAND: "Xorg" #0 [ffff8800792db790] machine_kexec at ffffffff8104ef62 /usr/src/linux/arch/x86/kernel/machine_kexec_64.c: 320 #1 [ffff8800792db7e0] crash_kexec at ffffffff810ed983 /usr/src/linux/kernel/kexec.c: 1482 #2 [ffff8800792db8b0] oops_end at ffffffff810176e8 /usr/src/linux/arch/x86/kernel/dumpstack.c: 231 #3 [ffff8800792db8e0] no_context at ffffffff8169af1f /usr/src/linux/arch/x86/mm/fault.c: 724 #4 [ffff8800792db940] __bad_area_nosemaphore at ffffffff8169aff6 /usr/src/linux/arch/x86/mm/fault.c: 804 #5 [ffff8800792db990] bad_area at ffffffff8169b31f /usr/src/linux/arch/x86/mm/fault.c: 833 #6 [ffff8800792db9c0] __do_page_fault at ffffffff81059b37 /usr/src/linux/arch/x86/mm/fault.c: 1213 #7 [ffff8800792dbae0] do_page_fault at ffffffff81059c11 /usr/src/linux/arch/x86/mm/fault.c: 1295 #8 [ffff8800792dbb10] page_fault at ffffffff816a8a28 /usr/src/linux/arch/x86/kernel/entry_64.S: 1283 [exception RIP: skb_queue_tail+55] RIP: ffffffff81594c57 RSP: ffff8800792dbbc8 RFLAGS: 00010046 RAX: 0000000000000292 RBX: ffff88007cbc6d10 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000292 RDI: ffff88007cbc6d24 RBP: ffff8800792dbbe8 R8: 0000000000000292 R9: 0180000002800000 R10: 0000000700020008 R11: 0000000000000000 R12: ffff88007b65aa00 R13: ffff88007cbc6d24 R14: 0000000000000000 R15: ffff88007cbc6c80 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #9 [ffff8800792dbbf0] unix_stream_sendmsg at ffffffff816491bd /usr/src/linux/net/unix/af_unix.c: 1711 #10 [ffff8800792dbcb0] sock_aio_write at ffffffff8158c0c3 /usr/src/linux/net/socket.c: 955 #11 [ffff8800792dbd90] do_sync_readv_writev at ffffffff811b42ec /usr/src/linux/fs/read_write.c: 697 #12 [ffff8800792dbe20] do_readv_writev at ffffffff811b5c95 /usr/src/linux/fs/read_write.c: 851 #13 [ffff8800792dbf20] vfs_writev at ffffffff811b5db9 /usr/src/linux/fs/read_write.c: 893 #14 [ffff8800792dbf30] sys_writev at ffffffff811b5eea /usr/src/linux/fs/read_write.c: 926 #15 [ffff8800792dbf80] system_call_fastpath at ffffffff816a6ae9 /usr/src/linux/arch/x86/kernel/entry_64.S: 423 RIP: 00007f3d056223c0 RSP: 00007ffff316be40 RFLAGS: 00003293 RAX: ffffffffffffffda RBX: ffffffff816a6ae9 RCX: ffffffffffffffff RDX: 0000000000000001 RSI: 00007ffff316af90 RDI: 0000000000000014 RBP: 0000000001d59be0 R8: 0000000000000000 R9: 0000000000000004 R10: 00000000ffffffff R11: 0000000000003293 R12: 00007f3d077406a0 R13: 0000000000000001 R14: 00007ffff316af90 R15: 0000000000000000 ORIG_RAX: 0000000000000014 CS: 0033 SS: 002b ---------- Crash pattern 2 end ---------- ---------- Crash pattern 3 start ---------- [ 88.675004] [TTM] Failed allocating page table [ 88.678152] BUG: unable to handle kernel paging request at ffff8801531d77c0 [ 88.679845] IP: [<ffffffff815964b5>] __alloc_skb+0x165/0x2b0 [ 88.681221] PGD 1f2b067 PUD 0 [ 88.682000] Oops: 0002 [#1] SMP [ 88.682838] Modules linked in: stap_fault_injection(OE) ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_mangle ip6table_raw ip6table_filter ip6_tables iptable_mangle iptable_raw iptable_filter ip_tables coretemp crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel dm_mirror dm_region_hash aesni_intel dm_log glue_helper dm_mod lrw gf128mul ablk_helper cryptd ppdev vmw_balloon microcode serio_raw pcspkr parport_pc shpchp vmw_vmci parport i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc uinput sd_mod ata_generic pata_acpi e1000 ata_piix libata mptspi scsi_transport_spi mptscsih mptbase floppy [ 88.701377] CPU: 0 PID: 3904 Comm: gnome-shell Tainted: G W OE 3.19.0-rc5+ #31 [ 88.703292] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 [ 88.705840] task: ffff880079e05780 ti: ffff88007918c000 task.ti: ffff88007918c000 [ 88.707575] RIP: 0010:[<ffffffff815964b5>] [<ffffffff815964b5>] __alloc_skb+0x165/0x2b0 [ 88.709601] RSP: 0018:ffff88007918faa8 EFLAGS: 00010246 [ 88.710884] RAX: 00000000ffffffff RBX: ffff8800531d7700 RCX: 00000000ffffffff [ 88.712584] RDX: ffff8801531d77c0 RSI: 0000000000000000 RDI: ffff8800531d77c8 [ 88.714260] RBP: ffff88007918faf8 R08: 00000000ffffffc0 R09: 0000000000000200 [ 88.715927] R10: ffffffff8159639e R11: ffff88007f803700 R12: ffff8800531d7800 [ 88.717648] R13: 00000000ffffffff R14: ffff88007f803700 R15: 0000000000000100 [ 88.719327] FS: 00007fcafd8aaa00(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000 [ 88.721216] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 88.722548] CR2: ffff8801531d77c0 CR3: 00000000790ae000 CR4: 00000000000407f0 [ 88.724257] Stack: [ 88.724761] ffff88007a2cdf00 000000007a01b800 0000000000000246 00ff88007918fcd8 [ 88.726741] ffff88007918fae8 0000000000000003 0000000000000000 ffff88007918fba8 [ 88.728578] ffff88007a01b800 0000000000000000 ffff88007918fb58 ffffffff81596d5c [ 88.730582] Call Trace: [ 88.731243] [<ffffffff81596d5c>] alloc_skb_with_frags+0x5c/0x1e0 [ 88.732725] [<ffffffff811c99bc>] ? do_sys_poll+0x12c/0x5b0 [ 88.734208] [<ffffffff815910b6>] sock_alloc_send_pskb+0x196/0x250 [ 88.735710] [<ffffffff8159b887>] ? skb_copy_datagram_from_iter+0xe7/0x200 [ 88.737361] [<ffffffff8164ba07>] ? wait_for_unix_gc+0x27/0xa0 [ 88.738784] [<ffffffff8164928a>] unix_stream_sendmsg+0x2aa/0x430 [ 88.740213] [<ffffffff8158c0c3>] sock_aio_write+0x103/0x140 [ 88.741610] [<ffffffff811c8860>] ? poll_select_copy_remaining+0x130/0x130 [ 88.743278] [<ffffffff811b42ec>] do_sync_readv_writev+0x4c/0x80 [ 88.744721] [<ffffffff811b5c95>] do_readv_writev+0x1e5/0x280 [ 88.746109] [<ffffffff8158bf9d>] ? SYSC_recvfrom+0x13d/0x160 [ 88.747452] [<ffffffff81104424>] ? __audit_syscall_entry+0xb4/0x110 [ 88.748992] [<ffffffff811b5db9>] vfs_writev+0x39/0x50 [ 88.750192] [<ffffffff811b5eea>] SyS_writev+0x4a/0xd0 [ 88.751423] [<ffffffff811046b6>] ? __audit_syscall_exit+0x236/0x2e0 [ 88.753121] [<ffffffff816a6ae9>] system_call_fastpath+0x12/0x17 [ 88.754650] Code: b6 83 90 00 00 00 83 e0 f7 09 c8 b9 ff ff ff ff 85 f6 88 83 90 00 00 00 b8 ff ff ff ff 66 89 8b c2 00 00 00 66 89 83 c6 00 00 00 <48> c7 02 00 00 00 00 48 c7 42 08 00 00 00 00 48 c7 42 10 00 00 [ 88.761554] RIP [<ffffffff815964b5>] __alloc_skb+0x165/0x2b0 [ 88.763077] RSP <ffff88007918faa8> [ 88.763978] CR2: ffff8801531d77c0 crash> bt -l PID: 3904 TASK: ffff880079e05780 CPU: 0 COMMAND: "gnome-shell" #0 [ffff88007918f690] machine_kexec at ffffffff8104ef62 /usr/src/linux/arch/x86/kernel/machine_kexec_64.c: 320 #1 [ffff88007918f6e0] crash_kexec at ffffffff810ed983 /usr/src/linux/kernel/kexec.c: 1482 #2 [ffff88007918f7b0] oops_end at ffffffff810176e8 /usr/src/linux/arch/x86/kernel/dumpstack.c: 231 #3 [ffff88007918f7e0] no_context at ffffffff8169af1f /usr/src/linux/arch/x86/mm/fault.c: 724 #4 [ffff88007918f840] __bad_area_nosemaphore at ffffffff8169aff6 /usr/src/linux/arch/x86/mm/fault.c: 804 #5 [ffff88007918f890] bad_area_nosemaphore at ffffffff8169b162 /usr/src/linux/arch/x86/mm/fault.c: 812 #6 [ffff88007918f8a0] __do_page_fault at ffffffff810596f8 /usr/src/linux/arch/x86/mm/fault.c: 1277 #7 [ffff88007918f9c0] do_page_fault at ffffffff81059c11 /usr/src/linux/arch/x86/mm/fault.c: 1295 #8 [ffff88007918f9f0] page_fault at ffffffff816a8a28 /usr/src/linux/arch/x86/kernel/entry_64.S: 1283 [exception RIP: __alloc_skb+357] RIP: ffffffff815964b5 RSP: ffff88007918faa8 RFLAGS: 00010246 RAX: 00000000ffffffff RBX: ffff8800531d7700 RCX: 00000000ffffffff RDX: ffff8801531d77c0 RSI: 0000000000000000 RDI: ffff8800531d77c8 RBP: ffff88007918faf8 R8: 00000000ffffffc0 R9: 0000000000000200 R10: ffffffff8159639e R11: ffff88007f803700 R12: ffff8800531d7800 R13: 00000000ffffffff R14: ffff88007f803700 R15: 0000000000000100 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #9 [ffff88007918fb00] alloc_skb_with_frags at ffffffff81596d5c /usr/src/linux/net/core/skbuff.c: 4386 #10 [ffff88007918fb60] sock_alloc_send_pskb at ffffffff815910b6 /usr/src/linux/net/core/sock.c: 1826 #11 [ffff88007918fbf0] unix_stream_sendmsg at ffffffff8164928a /usr/src/linux/net/unix/af_unix.c: 1682 #12 [ffff88007918fcb0] sock_aio_write at ffffffff8158c0c3 /usr/src/linux/net/socket.c: 955 #13 [ffff88007918fd90] do_sync_readv_writev at ffffffff811b42ec /usr/src/linux/fs/read_write.c: 697 #14 [ffff88007918fe20] do_readv_writev at ffffffff811b5c95 /usr/src/linux/fs/read_write.c: 851 #15 [ffff88007918ff20] vfs_writev at ffffffff811b5db9 /usr/src/linux/fs/read_write.c: 893 #16 [ffff88007918ff30] sys_writev at ffffffff811b5eea /usr/src/linux/fs/read_write.c: 926 #17 [ffff88007918ff80] system_call_fastpath at ffffffff816a6ae9 /usr/src/linux/arch/x86/kernel/entry_64.S: 423 RIP: 00007fcaf3c273c0 RSP: 00007fffadd91330 RFLAGS: 00000246 RAX: ffffffffffffffda RBX: ffffffff816a6ae9 RCX: 00007fffadd91360 RDX: 0000000000000002 RSI: 00007fffadd914b0 RDI: 0000000000000006 RBP: 0000000000b5c230 R8: 0000000000000000 R9: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fffadd91428 R13: 00007fffadd91424 R14: 0000000000b5c248 R15: 0000000000000001 ORIG_RAX: 0000000000000014 CS: 0033 SS: 002b ---------- Crash pattern 3 end ---------- ---------- Failed memory allocation start ---------- 0xffffffff81199850 : __kmalloc+0x0/0x280 [kernel] /usr/src/linux/mm/slub.c:3247 0xffffffff814676fa : ttm_tt_init+0x8a/0xb0 [kernel] /usr/src/linux/include/linux/slab.h:524 /usr/src/linux/include/linux/slab.h:535 /usr/src/linux/include/drm/drm_mem_util.h:38 /usr/src/linux/drivers/gpu/drm/ttm/ttm_tt.c:53 /usr/src/linux/drivers/gpu/drm/ttm/ttm_tt.c:200 0xffffffff8147caa6 : vmw_ttm_tt_create+0x76/0xb0 [kernel] /usr/src/linux/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c:700 0xffffffff81467b8d : ttm_bo_add_ttm+0x9d/0xe0 [kernel] /usr/src/linux/drivers/gpu/drm/ttm/ttm_bo.c:238 0xffffffff8146a2ff : ttm_bo_validate+0x14f/0x1f0 [kernel] /usr/src/linux/drivers/gpu/drm/ttm/ttm_bo.c:1067 0xffffffff8146a5d4 : ttm_bo_init+0x234/0x470 [kernel] /usr/src/linux/drivers/gpu/drm/ttm/ttm_bo.c:1167 0xffffffff8147ae9e : vmw_dmabuf_init+0x13e/0x240 [kernel] /usr/src/linux/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c:435 0xffffffff8147b0cb : vmw_user_dmabuf_alloc+0x8b/0x120 [kernel] /usr/src/linux/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c:503 0xffffffff8147b202 : vmw_dmabuf_alloc_ioctl+0x52/0xb0 [kernel] /usr/src/linux/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c:698 0xffffffff814497a4 : drm_ioctl+0x1a4/0x630 [kernel] /usr/src/linux/drivers/gpu/drm/drm_ioctl.c:727 0xffffffff814773c9 : vmw_generic_ioctl+0x169/0x260 [kernel] /usr/src/linux/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c:1073 0xffffffff814774f5 : vmw_unlocked_ioctl+0x15/0x20 [kernel] /usr/src/linux/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c:1084 0xffffffff811c7c18 : do_vfs_ioctl+0x2f8/0x510 [kernel] /usr/src/linux/fs/ioctl.c:44 /usr/src/linux/fs/ioctl.c:602 0xffffffff811c7e71 : sys_ioctl+0x41/0x80 [kernel] /usr/src/linux/include/linux/file.h:38 /usr/src/linux/fs/ioctl.c:618 /usr/src/linux/fs/ioctl.c:608 0xffffffff816a6ae9 : system_call_fastpath+0x12/0x17 [kernel] /usr/src/linux/arch/x86/kernel/entry_64.S:423 ---------- Failed memory allocation end ---------- If I skip ttm_tt_destroy() call, this bug no longer occurs. Therefore, I guess that this memory corruption is caused by the destroy function being called with partially initialized ttm object. --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -199,8 +199,8 @@ int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, ttm_tt_alloc_page_directory(ttm); if (!ttm->pages) { - ttm_tt_destroy(ttm); - pr_err("Failed allocating page table\n"); + //ttm_tt_destroy(ttm); + pr_err("Failed allocating page table, but skip ttm_tt_destroy()\n"); return -ENOMEM; } return 0; I can reproduce this problem at least since 3.13.0. I don't know whether this problem is specific to vmwgfx code or not, for I tested only CentOS 7 with GUI environment on VMware Player 6. I think you can reproduce this problem by starting a SystemTap script shown below and then flipping windows using from Ctrl-Alt-F1 to Ctrl-Alt-F7 . ---------- Reproducer start ---------- # stap -g -e 'global is_target%; probe begin { printf("Probe start!\n"); } probe module("ttm").function("ttm_tt_init") { is_target[tid()] = 1; } probe module("ttm").function("ttm_tt_init").return { is_target[tid()] = 0; } probe kernel.function("__kmalloc") { if (($flags & %{ __GFP_NOFAIL | __GFP_WAIT %} ) == %{ __GFP_WAIT %} && is_target[tid()]) { print_backtrace(); $size = 1 << 30; exit(); } } probe end { delete is_target; }' ---------- Reproducer end ---------- I can also reproduce below problem using 3.10.0-123.9.3.el7.x86_64 , though below problem might be different from above problem. ---------- Crash pattern 4 start ---------- [TTM] Failed allocating page table ------------[ cut here ]------------ WARNING: at lib/list_debug.c:33 __list_add+0xac/0xc0() list_add corruption. prev->next should be next (ffff88007af4cd98), but was (null). (prev=ffff88007ac881f0). Modules linked in: fuse btrfs zlib_deflate raid6_pq xor vfat msdos fat ext4 mbcache jbd2 netconsole ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables sg coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul ppdev glue_helper vmw_balloon ablk_helper cryptd serio_raw parport_pc i2c_piix4 parport vmw_vmci pcspkr dm_mirror shpchp dm_region_hash dm_log mperf dm_mod nfsd auth_rpcgss nfs_acl lockd sunrpc uinput xfs libcrc32c sr_mod cdrom sd_mod crc_t10dif crct10dif_common ata_generic pata_acpi crc32c_intel vmwgfx mptspi ttm scsi_transport_spi mptscsih ahci ata_piix libahci drm mptbase libata e1000 i2c_core floppy [last unloaded: stap_bad36894e80d53e8ee72ce3ee48a27ac_3394] CPU: 0 PID: 849 Comm: Xorg Tainted: GF W O-------------- 3.10.0-123.9.3.el7.x86_64 #1 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 ffff88007984da10 00000000da42f7a4 ffff88007984d9c8 ffffffff815e239b ffff88007984da00 ffffffff8105dee1 ffff88007ac881f0 ffff88007af4cd98 ffff88007ac881f0 0000000000000282 ffff88007984db98 ffff88007984da68 Call Trace: [<ffffffff815e239b>] dump_stack+0x19/0x1b [<ffffffff8105dee1>] warn_slowpath_common+0x61/0x80 [<ffffffff8105df5c>] warn_slowpath_fmt+0x5c/0x80 [<ffffffff812cfeec>] __list_add+0xac/0xc0 [<ffffffffa01a56e9>] vmw_fence_create+0xd9/0x130 [vmwgfx] [<ffffffffa0197ef8>] vmw_execbuf_fence_commands+0xc8/0x120 [vmwgfx] [<ffffffffa01987b8>] vmw_execbuf_process+0x4f8/0xbe0 [vmwgfx] [<ffffffff81194585>] ? __kmalloc+0x55/0x230 [<ffffffffa0199af8>] do_dmabuf_dirty_sou.isra.9+0x328/0x3c0 [vmwgfx] [<ffffffffa00da00c>] ? ttm_read_lock+0x2c/0xd0 [ttm] [<ffffffffa00d50a1>] ? ttm_bo_add_to_lru+0x51/0xc0 [ttm] [<ffffffffa0199d50>] vmw_framebuffer_dmabuf_dirty+0x1c0/0x1f0 [vmwgfx] [<ffffffff81194723>] ? __kmalloc+0x1f3/0x230 [<ffffffffa012d3f0>] drm_mode_dirtyfb_ioctl+0xe0/0x190 [drm] [<ffffffffa011cdb2>] drm_ioctl+0x502/0x630 [drm] [<ffffffff815edbb4>] ? __do_page_fault+0x204/0x540 [<ffffffff812c0e64>] ? timerqueue_del+0x24/0x70 [<ffffffff81089486>] ? __remove_hrtimer+0x46/0xa0 [<ffffffffa019ca71>] vmw_unlocked_ioctl+0x51/0x80 [vmwgfx] [<ffffffff811c2b25>] do_vfs_ioctl+0x2e5/0x4c0 [<ffffffff810650d6>] ? do_setitimer+0xe6/0x2a0 [<ffffffff811c2da1>] SyS_ioctl+0xa1/0xc0 [<ffffffff815f2a99>] system_call_fastpath+0x16/0x1b ---[ end trace a993c155f4775b96 ]--- ------------[ cut here ]------------ WARNING: at lib/list_debug.c:36 __list_add+0x8a/0xc0() list_add double add: new=ffff88007ac881f0, prev=ffff88007ac881f0, next=ffff88007af4cd98. Modules linked in: fuse btrfs zlib_deflate raid6_pq xor vfat msdos fat ext4 mbcache jbd2 netconsole ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables sg coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul ppdev glue_helper vmw_balloon ablk_helper cryptd serio_raw parport_pc i2c_piix4 parport vmw_vmci pcspkr dm_mirror shpchp dm_region_hash dm_log mperf dm_mod nfsd auth_rpcgss nfs_acl lockd sunrpc uinput xfs libcrc32c sr_mod cdrom sd_mod crc_t10dif crct10dif_common ata_generic pata_acpi crc32c_intel vmwgfx mptspi ttm scsi_transport_spi mptscsih ahci ata_piix libahci drm mptbase libata e1000 i2c_core floppy [last unloaded: stap_bad36894e80d53e8ee72ce3ee48a27ac_3394] CPU: 0 PID: 849 Comm: Xorg Tainted: GF W O-------------- 3.10.0-123.9.3.el7.x86_64 #1 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 ffff88007984da10 00000000da42f7a4 ffff88007984d9c8 ffffffff815e239b ffff88007984da00 ffffffff8105dee1 ffff88007ac881f0 ffff88007af4cd98 ffff88007ac881f0 0000000000000282 ffff88007984db98 ffff88007984da68 Call Trace: [<ffffffff815e239b>] dump_stack+0x19/0x1b [<ffffffff8105dee1>] warn_slowpath_common+0x61/0x80 [<ffffffff8105df5c>] warn_slowpath_fmt+0x5c/0x80 [<ffffffff812cfeca>] __list_add+0x8a/0xc0 [<ffffffffa01a56e9>] vmw_fence_create+0xd9/0x130 [vmwgfx] [<ffffffffa0197ef8>] vmw_execbuf_fence_commands+0xc8/0x120 [vmwgfx] [<ffffffffa01987b8>] vmw_execbuf_process+0x4f8/0xbe0 [vmwgfx] [<ffffffff81194585>] ? __kmalloc+0x55/0x230 [<ffffffffa0199af8>] do_dmabuf_dirty_sou.isra.9+0x328/0x3c0 [vmwgfx] [<ffffffffa00da00c>] ? ttm_read_lock+0x2c/0xd0 [ttm] [<ffffffffa00d50a1>] ? ttm_bo_add_to_lru+0x51/0xc0 [ttm] [<ffffffffa0199d50>] vmw_framebuffer_dmabuf_dirty+0x1c0/0x1f0 [vmwgfx] [<ffffffff81194723>] ? __kmalloc+0x1f3/0x230 [<ffffffffa012d3f0>] drm_mode_dirtyfb_ioctl+0xe0/0x190 [drm] [<ffffffffa011cdb2>] drm_ioctl+0x502/0x630 [drm] [<ffffffff815edbb4>] ? __do_page_fault+0x204/0x540 [<ffffffff812c0e64>] ? timerqueue_del+0x24/0x70 [<ffffffff81089486>] ? __remove_hrtimer+0x46/0xa0 [<ffffffffa019ca71>] vmw_unlocked_ioctl+0x51/0x80 [vmwgfx] [<ffffffff811c2b25>] do_vfs_ioctl+0x2e5/0x4c0 [<ffffffff810650d6>] ? do_setitimer+0xe6/0x2a0 [<ffffffff811c2da1>] SyS_ioctl+0xa1/0xc0 [<ffffffff815f2a99>] system_call_fastpath+0x16/0x1b ---[ end trace a993c155f4775b97 ]--- INFO: rcu_sched detected stalls on CPUs/tasks: { 0} (detected by 1, t=60019 jiffies, g=6722, c=6721, q=0) sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 849 Comm: Xorg Tainted: GF W O-------------- 3.10.0-123.9.3.el7.x86_64 #1 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 task: ffff880077655b00 ti: ffff88007984c000 task.ti: ffff88007984c000 RIP: 0010:[<ffffffff8108ece5>] [<ffffffff8108ece5>] __wake_up_common+0x5/0x90 RSP: 0018:ffff88007984d9d0 EFLAGS: 00000046 RAX: 0000000000000046 RBX: ffff88007ac88220 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88007ac88220 RBP: ffff88007984da00 R08: 0000000000000000 R09: ffff88007f617320 R10: ffffea000173f700 R11: ffffffffa01a462d R12: 0000000000000046 R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000 FS: 00007faaaca78980(0000) GS:ffff88007f600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faaa4b3c000 CR3: 000000007baaf000 CR4: 00000000000407f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Stack: ffffffff81090af9 ffff88007af4cd80 ffff88007ac881e0 ffff88007ac881f0 ffff88007984da48 ffff88007ac881e0 ffff88007984da88 ffffffffa01a524b ffffc90008680018 ffff88007af4cda8 ffff88007af4cdd8 0000000000000292 Call Trace: [<ffffffff81090af9>] ? __wake_up+0x39/0x50 [<ffffffffa01a524b>] vmw_fences_update+0x11b/0x220 [vmwgfx] [<ffffffffa01a2568>] vmw_update_seqno+0x48/0x50 [vmwgfx] [<ffffffffa01a2073>] vmw_fifo_send_fence+0x93/0xe0 [vmwgfx] [<ffffffffa0197e85>] vmw_execbuf_fence_commands+0x55/0x120 [vmwgfx] [<ffffffffa01987b8>] vmw_execbuf_process+0x4f8/0xbe0 [vmwgfx] [<ffffffffa01998d0>] do_dmabuf_dirty_sou.isra.9+0x100/0x3c0 [vmwgfx] [<ffffffffa00da00c>] ? ttm_read_lock+0x2c/0xd0 [ttm] [<ffffffffa00d50a1>] ? ttm_bo_add_to_lru+0x51/0xc0 [ttm] [<ffffffffa0199d50>] vmw_framebuffer_dmabuf_dirty+0x1c0/0x1f0 [vmwgfx] [<ffffffff81194723>] ? __kmalloc+0x1f3/0x230 [<ffffffffa012d3f0>] drm_mode_dirtyfb_ioctl+0xe0/0x190 [drm] [<ffffffffa011cdb2>] drm_ioctl+0x502/0x630 [drm] [<ffffffff815edbb4>] ? __do_page_fault+0x204/0x540 [<ffffffff812c0e64>] ? timerqueue_del+0x24/0x70 [<ffffffff81089486>] ? __remove_hrtimer+0x46/0xa0 [<ffffffffa019ca71>] vmw_unlocked_ioctl+0x51/0x80 [vmwgfx] [<ffffffff811c2b25>] do_vfs_ioctl+0x2e5/0x4c0 [<ffffffff810650d6>] ? do_setitimer+0xe6/0x2a0 [<ffffffff811c2da1>] SyS_ioctl+0xa1/0xc0 [<ffffffff815f2a99>] system_call_fastpath+0x16/0x1b Code: 49 0f af c0 e9 64 ff ff ff 0f 1f 44 00 00 44 8d 4a ff 31 c0 45 31 c0 4d 63 c9 e9 4e ff ff ff 0f 1f 80 00 00 00 00 66 66 66 66 90 <55> 48 89 e5 41 57 41 89 f7 41 56 41 89 ce 41 55 41 54 4c 8d 67 ---------- Crash pattern 4 end ---------- [View Less]

4 3

divide error in fbcon_switch
by syzbot 27 Jul '20

27 Jul '20

Hello, syzbot found the following crash on: HEAD commit: 76bb8b05 Merge tag 'kbuild-v5.5' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1508781ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=dd226651cb0f364b dashboard link: https://syzkaller.appspot.com/bug?extid=13013adc4a234406c29e compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=… [View More]132b742ae00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1568f97ee00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+13013adc4a234406c29e(a)syzkaller.appspotmail.com divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events console_callback RIP: 0010:fbcon_update_softback drivers/video/fbdev/core/fbcon.c:378 [inline] RIP: 0010:fbcon_switch+0x20d/0x17f0 drivers/video/fbdev/core/fbcon.c:2247 Code: a4 3b 08 4c 89 3d 33 a4 3b 08 38 d0 7c 08 84 d2 0f 85 48 13 00 00 41 8b 9d 3c 03 00 00 31 d2 bf 05 00 00 00 8b 05 f3 07 13 06 <f7> f3 41 89 c4 89 c6 e8 67 48 c3 fd 41 83 fc 05 0f 8e d7 0b 00 00 RSP: 0018:ffffc90000d2f9d8 EFLAGS: 00010246 RAX: 0000000000008000 RBX: 0000000000000000 RCX: ffffffff83b1b314 RDX: 0000000000000000 RSI: ffffffff83b1b322 RDI: 0000000000000005 RBP: ffffc90000d2fb68 R08: ffff8880a9a06300 R09: fffffbfff14b0ac8 R10: fffffbfff14b0ac7 R11: ffffffff8a58563b R12: 0000000000000000 R13: ffff88809e21f000 R14: ffff8880a40fc000 R15: ffff8880a3860000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb4a5f9a000 CR3: 00000000a64af000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: redraw_screen+0x2b6/0x7d0 drivers/tty/vt/vt.c:997 complete_change_console+0x105/0x3a0 drivers/tty/vt/vt_ioctl.c:1264 change_console+0x19b/0x2c0 drivers/tty/vt/vt_ioctl.c:1389 console_callback+0x3a1/0x400 drivers/tty/vt/vt.c:2824 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace 074c38236abce447 ]--- RIP: 0010:fbcon_update_softback drivers/video/fbdev/core/fbcon.c:378 [inline] RIP: 0010:fbcon_switch+0x20d/0x17f0 drivers/video/fbdev/core/fbcon.c:2247 Code: a4 3b 08 4c 89 3d 33 a4 3b 08 38 d0 7c 08 84 d2 0f 85 48 13 00 00 41 8b 9d 3c 03 00 00 31 d2 bf 05 00 00 00 8b 05 f3 07 13 06 <f7> f3 41 89 c4 89 c6 e8 67 48 c3 fd 41 83 fc 05 0f 8e d7 0b 00 00 RSP: 0018:ffffc90000d2f9d8 EFLAGS: 00010246 RAX: 0000000000008000 RBX: 0000000000000000 RCX: ffffffff83b1b314 RDX: 0000000000000000 RSI: ffffffff83b1b322 RDI: 0000000000000005 RBP: ffffc90000d2fb68 R08: ffff8880a9a06300 R09: fffffbfff14b0ac8 R10: fffffbfff14b0ac7 R11: ffffffff8a58563b R12: 0000000000000000 R13: ffff88809e21f000 R14: ffff8880a40fc000 R15: ffff8880a3860000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb4a5f9a000 CR3: 00000000a64af000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches [View Less]

1 1

[Bug 204181] New: NULL pointer dereference regression in amdgpu
by bugzilla-daemon＠bugzilla.kernel.org 26 Jul '20

26 Jul '20

https://bugzilla.kernel.org/show_bug.cgi?id=204181 Bug ID: 204181 Summary: NULL pointer dereference regression in amdgpu Product: Drivers Version: 2.5 Kernel Version: 5.2.1 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri(a)kernel-bugs.osdl.org Reporter:… [View More] virtuousfox(a)gmail.com Regression: No Created attachment 283693 --> https://bugzilla.kernel.org/attachment.cgi?id=283693&action=edit dmesg After updating from 5.1 to 5.2.1 in about 5-10 minutes of watching a Youtube video in Firefox I now get complete lock-up of video output and inability to shutdown using power button. Using "magic keys" allows me to reboot and get kernel log via `journalctl -b -1 -k`, here is relevant part: BUG: kernel NULL pointer dereference, address: 00000000000002b4 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 2 PID: 8200 Comm: kworker/u16:1 Tainted: G IO 5.2.1-1383.gd5bbc26-HSF #1 openSUSE Tumbleweed (unreleased) Hardware name: Gigabyte Technology Co., Ltd. GA-990XA-UD3/GA-990XA-UD3, BIOS F14e 09/09/2014 Workqueue: events_unbound commit_work RIP: 0010:dc_stream_log+0x6/0xb0 [amdgpu] Code: 04 00 00 49 8b bc 02 80 02 00 00 48 8b 07 48 8b 40 50 e8 ed 88 a8 d6 b8 01 00 00 00 c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 53 <8b> 86 b4 02 00 00 48 89 f3 48 89 f2 8b 8e 10 01 00 00 bf 04 00 00 RSP: 0018:ffffa5568b1b7c00 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000002 RDX: ffffffffc07fbd50 RSI: 0000000000000000 RDI: ffff8e9ee9500000 RBP: ffff8e9d90618000 R08: 0000000000000001 R09: 0000000000000000 R10: ffffa5568b1b7c30 R11: 0000000000000000 R12: ffff8e9ee9500000 R13: ffff8e9ededb4448 R14: ffff8e9e47e10c00 R15: ffff8e9ededa0000 FS: 0000000000000000(0000) GS:ffff8e9eee000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000002b4 CR3: 00000003bcf46000 CR4: 00000000000406e0 Call Trace: dc_commit_state+0x79/0xb0 [amdgpu] amdgpu_dm_atomic_commit_tail+0x3c0/0xdb0 [amdgpu] ? finish_task_switch+0x74/0x300 ? __switch_to+0x152/0x4e0 ? __switch_to_asm+0x34/0x70 ? __lock_acquire+0x3c8/0x7a0 ? find_held_lock+0x32/0x90 ? find_held_lock+0x32/0x90 ? sched_clock+0x5/0x10 ? mark_held_locks+0x2d/0x80 ? preempt_count_sub+0x98/0xe0 ? _raw_spin_unlock_irq+0x3a/0x50 ? wait_for_completion_timeout+0xe9/0x110 ? commit_tail+0x3c/0x70 commit_tail+0x3c/0x70 process_one_work+0x271/0x5f0 worker_thread+0x4a/0x3d0 ? process_one_work+0x5f0/0x5f0 kthread+0x118/0x140 ? kthread_create_worker_on_cpu+0x70/0x70 ret_from_fork+0x27/0x50 Modules linked in: af_packet ts_bm xt_pkttype xt_string nf_nat_ftp nf_conntrack_ftp xt_tcpudp ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nfnetlink ebtable_filter ebtables scsi_transport_iscsi ip6table_filter ip6_tables iptable_filter ip_tables x_tables bpfilter snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq zram snd_pcm_oss rfcomm snd_mixer_oss it87 hwmon_vid bnep msr rc_avermedia tuner_simple tuner_types amd64_edac_mod tuner tda7432 edac_mce_amd btusb tvaudio kvm_amd ath9k btrtl btbcm msp3400 ath9k_common btintel bluetooth ath9k_hw kvm irqbypass ath bttv tea575x joydev tveeprom videobuf_dma_sg snd_usb_audio videobuf_core snd_usbmidi_lib rc_core snd_rawmidi snd_hda_codec_realtek mac80211 snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi v4l2_common snd_seq_device snd_hda_intel videodev sp5100_tco pcspkr snd_hda_codec wmi_bmof mxm_wmi amdgpu fam15h_power k10temp media i2c_piix4 cfg80211 r8169 snd_hda_core gpu_sched realtek snd_hwdep libphy ttm rfkill snd_pcm mac_hid hid_generic usbhid uas usb_storage ohci_pci serio_raw sd_mod ehci_pci ohci_hcd xhci_pci ehci_hcd xhci_hcd wmi exfat(O) l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppox ppp_generic slhc vhba(O) uinput sg nbd dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua ecryptfs CR2: 00000000000002b4 ---[ end trace 0633d97cb3f2d2d6 ]--- RIP: 0010:dc_stream_log+0x6/0xb0 [amdgpu] Code: 04 00 00 49 8b bc 02 80 02 00 00 48 8b 07 48 8b 40 50 e8 ed 88 a8 d6 b8 01 00 00 00 c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 53 <8b> 86 b4 02 00 00 48 89 f3 48 89 f2 8b 8e 10 01 00 00 bf 04 00 00 RSP: 0018:ffffa5568b1b7c00 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000002 RDX: ffffffffc07fbd50 RSI: 0000000000000000 RDI: ffff8e9ee9500000 RBP: ffff8e9d90618000 R08: 0000000000000001 R09: 0000000000000000 R10: ffffa5568b1b7c30 R11: 0000000000000000 R12: ffff8e9ee9500000 R13: ffff8e9ededb4448 R14: ffff8e9e47e10c00 R15: ffff8e9ededa0000 FS: 0000000000000000(0000) GS:ffff8e9eee000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000002b4 CR3: 00000003bcf46000 CR4: 00000000000406e0 -- You are receiving this mail because: You are watching the assignee of the bug. 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[Bug 205815] New: When playing a wine game, got black screen then screen flickers, game crashes and back to normal
by bugzilla-daemon＠bugzilla.kernel.org 10 Jul '20

10 Jul '20

https://bugzilla.kernel.org/show_bug.cgi?id=205815 Bug ID: 205815 Summary: When playing a wine game, got black screen then screen flickers, game crashes and back to normal Product: Drivers Version: 2.5 Kernel Version: 5.4.2-1~exp1 (Debian experimental) Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: … [View More]

1 4

[PATCH v2 00/14] Support more HDMI modes on RK3228/RK3328
by Jonas Karlman 07 Jul '20

07 Jul '20

This series make it possible to use more HDMI modes on RK3328, and presumably also on RK3228. It also prepares for a future YUV420 and 10-bit output series. Part of this has been reworked from vendor BSP 4.4 kernel commits. Patch 1-5 fixes issues and shortcomings in the inno hdmi phy driver. Patch 6 prepares for use of high TMDS bit rates used with HDMI 2.0 and 10-bit output modes. Patch 7-13 changes rk3228/rk3328 to use mode_valid functions suited for the inno hdmi phy instead of the dw-… [View More]hdmi phy. These changes allows for more CEA modes to be usable, e.g. some 4K and fractal modes. Patch 14 adds support for more pixel clock rates in order to support common DMT modes in addition to CEA modes. Note: I have only been able to build test RK322x related changes as I do not have any RK322x device to test on. All modes, including fractal modes, has been tested with modetest on a RK3328 Rock64 device using e.g. modetest -M rockchip -s 39:3840x2160-29.97 Changes in v2: - collect acked-by tag - drop the limit resolution width to 3840 patch This series is also available at [1] and the early work on YUV420 and 10-bit output is available at [2]. [1] https://github.com/Kwiboo/linux-rockchip/commits/next-20200108-inno-hdmi-phy [2] https://github.com/Kwiboo/linux-rockchip/commits/next-20200108-bus-format Regards, Jonas Algea Cao (1): phy/rockchip: inno-hdmi: Support more pre-pll configuration Huicong Xu (1): phy/rockchip: inno-hdmi: force set_rate on power_on Jonas Karlman (11): phy/rockchip: inno-hdmi: use correct vco_div_5 macro on rk3328 phy/rockchip: inno-hdmi: remove unused no_c from rk3328 recalc_rate phy/rockchip: inno-hdmi: do not power on rk3328 post pll on reg write drm/rockchip: dw-hdmi: allow high tmds bit rates drm/rockchip: dw-hdmi: require valid vpll clock rate on rk3228/rk3328 clk: rockchip: set parent rate for DCLK_VOP clock on rk3228 arm64: dts: rockchip: increase vop clock rate on rk3328 arm64: dts: rockchip: add vpll clock to hdmi node on rk3328 ARM: dts: rockchip: add vpll clock to hdmi node on rk3228 drm/rockchip: dw-hdmi: limit tmds to 340mhz on rk3228/rk3328 drm/rockchip: dw-hdmi: remove unused plat_data on rk3228/rk3328 Zheng Yang (1): phy/rockchip: inno-hdmi: round fractal pixclock in rk3328 recalc_rate arch/arm/boot/dts/rk322x.dtsi | 4 +- arch/arm64/boot/dts/rockchip/rk3328.dtsi | 6 +- drivers/clk/rockchip/clk-rk3228.c | 2 +- drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 47 ++++++-- drivers/phy/rockchip/phy-rockchip-inno-hdmi.c | 110 ++++++++++++------ 5 files changed, 120 insertions(+), 49 deletions(-) -- 2.17.1 [View Less]

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KASAN: vmalloc-out-of-bounds Write in bitfill_aligned
by syzbot 29 Jun '20

29 Jun '20

Hello, syzbot found the following crash on: HEAD commit: 63de3747 Merge tag 'tag-chrome-platform-for-v5.5' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1040fc41e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=1d189d07c6717979 dashboard link: https://syzkaller.appspot.com/bug?extid=e5fd3e65515b48c02a30 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. … [View More]IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e5fd3e65515b48c02a30(a)syzkaller.appspotmail.com ================================================================== BUG: KASAN: vmalloc-out-of-bounds in bitfill_aligned drivers/video/fbdev/core/sysfillrect.c:54 [inline] BUG: KASAN: vmalloc-out-of-bounds in bitfill_aligned+0x356/0x410 drivers/video/fbdev/core/sysfillrect.c:25 Write of size 8 at addr ffffc90008b11000 by task syz-executor.2/9476 CPU: 2 PID: 9476 Comm: syz-executor.2 Not tainted 5.4.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:638 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:140 bitfill_aligned drivers/video/fbdev/core/sysfillrect.c:54 [inline] bitfill_aligned+0x356/0x410 drivers/video/fbdev/core/sysfillrect.c:25 sys_fillrect+0x421/0x7c0 drivers/video/fbdev/core/sysfillrect.c:291 drm_fb_helper_sys_fillrect+0x21/0x190 drivers/gpu/drm/drm_fb_helper.c:736 bit_clear_margins+0x30b/0x530 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins+0x1e9/0x250 drivers/video/fbdev/core/fbcon.c:1372 fbcon_switch+0xd7f/0x17f0 drivers/video/fbdev/core/fbcon.c:2354 redraw_screen+0x2b6/0x7d0 drivers/tty/vt/vt.c:997 fbcon_modechanged+0x5c3/0x790 drivers/video/fbdev/core/fbcon.c:2991 fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038 fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051 do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1104 fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1180 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a759 Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8280324c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045a759 RDX: 0000000020000040 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82803256d4 R13: 00000000004a9e78 R14: 00000000006ec2d8 R15: 00000000ffffffff Memory state around the buggy address: ffffc90008b10f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90008b10f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffffc90008b11000: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ^ ffffc90008b11080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ffffc90008b11100: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. [View Less]

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[PATCH v5 1/2] dt-bindings: display: simple: Add Satoz panel
by Miquel Raynal 29 Jun '20

29 Jun '20

Satoz is a Chinese TFT manufacturer. Website: http://www.sat-sz.com/English/index.html Add the compatible for its SAT050AT40H12R2 5.0 inch LCD panel. Signed-off-by: Miquel Raynal <miquel.raynal(a)bootlin.com> --- Changes since v4: * Drop the satoz,sat050at40h12r2.yaml file in favor of the very new panel-simple.yaml common file. Just add the compatible there. Changes since v3: * Added the missing ".yaml" suffix in the $id. * Removed the unnecessary "contains" assertion about the … [View More]

3 5

[Bug 199475] New: AMDGPU Failed to blank
by bugzilla-daemon＠bugzilla.kernel.org 20 Jun '20

20 Jun '20

https://bugzilla.kernel.org/show_bug.cgi?id=199475 Bug ID: 199475 Summary: AMDGPU Failed to blank Product: Drivers Version: 2.5 Kernel Version: 4.15.18 Hardware: Other OS: Linux Tree: Mainline Status: NEW Severity: low Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri(a)kernel-bugs.osdl.org Reporter: andreassx0(a)gmail.… [View More]

1 9

BUG: unable to handle kernel paging request in sys_imageblit
by syzbot 19 Jun '20

19 Jun '20

Hello, syzbot found the following crash on: HEAD commit: 6794862a Merge tag 'for-5.5-rc1-kconfig-tag' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1574aaeae00000 kernel config: https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d dashboard link: https://syzkaller.appspot.com/bug?extid=33f89a9a6b6acd893b11 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. … [View More]IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+33f89a9a6b6acd893b11(a)syzkaller.appspotmail.com BUG: unable to handle page fault for address: fffff5200124c3fc #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 7ffcd067 P4D 7ffcd067 PUD 2cd1c067 PMD 299b2067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 2 PID: 9109 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline] RIP: 0010:sys_imageblit+0x61c/0x1240 drivers/video/fbdev/core/sysimgblt.c:275 Code: 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 57 0b 00 00 48 b9 00 00 00 00 00 fc ff df 4c 89 fa 8b 45 b0 23 07 4d 8d 77 04 48 c1 ea 03 <0f> b6 0c 0a 4c 89 fa 83 e2 07 33 45 c4 83 c2 03 38 ca 7c 08 84 c9 RSP: 0018:ffffc900042c7168 EFLAGS: 00010a06 RAX: 0000000000000000 RBX: ffff888076970800 RCX: dffffc0000000000 RDX: 1ffff9200124c3fc RSI: ffffffff83b4fada RDI: ffffffff887498e0 RBP: ffffc900042c7230 R08: ffff88805d278e40 R09: 000000000000007f R10: fffffbfff14f3347 R11: ffffffff8a799a3b R12: 0000000000000007 R13: 0000000000000007 R14: ffffc90009261fe4 R15: ffffc90009261fe0 FS: 00007f0af02fc700(0000) GS:ffff88802d200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff5200124c3fc CR3: 00000000278c2000 CR4: 0000000000340ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drm_fb_helper_sys_imageblit+0x21/0x180 drivers/gpu/drm/drm_fb_helper.c:768 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x9a3/0xf10 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x33c/0x3e0 drivers/video/fbdev/core/fbcon.c:1353 do_update_region+0x42b/0x6f0 drivers/tty/vt/vt.c:677 invert_screen+0x2da/0x650 drivers/tty/vt/vt.c:794 highlight drivers/tty/vt/selection.c:53 [inline] clear_selection drivers/tty/vt/selection.c:81 [inline] clear_selection+0x59/0x70 drivers/tty/vt/selection.c:77 vc_do_resize+0x1163/0x1460 drivers/tty/vt/vt.c:1200 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304 fbcon_do_set_font+0x4a6/0x960 drivers/video/fbdev/core/fbcon.c:2599 fbcon_set_font+0x72e/0x860 drivers/video/fbdev/core/fbcon.c:2696 con_font_set drivers/tty/vt/vt.c:4538 [inline] con_font_op+0xe30/0x1270 drivers/tty/vt/vt.c:4603 vt_ioctl+0xd2e/0x26d0 drivers/tty/vt/vt_ioctl.c:913 tty_ioctl+0xa37/0x14f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a7c9 Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0af02fbc88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045a7c9 RDX: 0000000020000000 RSI: 0000000000004b61 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0af02fc6d4 R13: 00000000004ab60f R14: 00000000006ede60 R15: 00000000ffffffff Modules linked in: CR2: fffff5200124c3fc ---[ end trace 7698227ca2d5f789 ]--- RIP: 0010:fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline] RIP: 0010:sys_imageblit+0x61c/0x1240 drivers/video/fbdev/core/sysimgblt.c:275 Code: 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 57 0b 00 00 48 b9 00 00 00 00 00 fc ff df 4c 89 fa 8b 45 b0 23 07 4d 8d 77 04 48 c1 ea 03 <0f> b6 0c 0a 4c 89 fa 83 e2 07 33 45 c4 83 c2 03 38 ca 7c 08 84 c9 RSP: 0018:ffffc900042c7168 EFLAGS: 00010a06 RAX: 0000000000000000 RBX: ffff888076970800 RCX: dffffc0000000000 RDX: 1ffff9200124c3fc RSI: ffffffff83b4fada RDI: ffffffff887498e0 RBP: ffffc900042c7230 R08: ffff88805d278e40 R09: 000000000000007f R10: fffffbfff14f3347 R11: ffffffff8a799a3b R12: 0000000000000007 R13: 0000000000000007 R14: ffffc90009261fe4 R15: ffffc90009261fe0 FS: 00007f0af02fc700(0000) GS:ffff88802d200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff5200124c3fc CR3: 00000000278c2000 CR4: 0000000000340ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. [View Less]

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BUG: unable to handle kernel paging request in drm_fb_helper_dirty_work
by syzbot 18 Jun '20

18 Jun '20

Hello, syzbot found the following crash on: HEAD commit: e42617b8 Linux 5.5-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=126dc282e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=3754e2c78c1adb82 dashboard link: https://syzkaller.appspot.com/bug?extid=8a2039467425e497e64a compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386 Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix … [View More]the bug, please add the following tag to the commit: Reported-by: syzbot+8a2039467425e497e64a(a)syzkaller.appspotmail.com BUG: unable to handle page fault for address: fffff520015a7200 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 7ffcd067 P4D 7ffcd067 PUD 2cd1c067 PMD 76d10067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Workqueue: events drm_fb_helper_dirty_work RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x9c/0x1a0 mm/kasan/generic.c:192 Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80 RSP: 0018:ffffc900004cfc30 EFLAGS: 00010216 RAX: fffff520015a7200 RBX: fffff520015a7400 RCX: ffffffff83f94dec RDX: 0000000000000001 RSI: 0000000000001000 RDI: ffffc9000ad39000 RBP: ffffc900004cfc48 R08: fffff520015a7400 R09: 0000000000000200 R10: fffff520015a73ff R11: ffffc9000ad39fff R12: fffff520015a7200 R13: ffffc9000ad39000 R14: ffffc9000a53a000 R15: ffffc9000a53a000 FS: 0000000000000000(0000) GS:ffff88802d100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff520015a7200 CR3: 0000000052ea7000 CR4: 0000000000340ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: memcpy+0x38/0x50 mm/kasan/common.c:126 memcpy include/linux/string.h:380 [inline] drm_fb_helper_dirty_blit_real drivers/gpu/drm/drm_fb_helper.c:399 [inline] drm_fb_helper_dirty_work+0x44c/0x780 drivers/gpu/drm/drm_fb_helper.c:428 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: CR2: fffff520015a7200 ---[ end trace 1682650b38de1096 ]--- RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x9c/0x1a0 mm/kasan/generic.c:192 Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80 RSP: 0018:ffffc900004cfc30 EFLAGS: 00010216 RAX: fffff520015a7200 RBX: fffff520015a7400 RCX: ffffffff83f94dec RDX: 0000000000000001 RSI: 0000000000001000 RDI: ffffc9000ad39000 RBP: ffffc900004cfc48 R08: fffff520015a7400 R09: 0000000000000200 R10: fffff520015a73ff R11: ffffc9000ad39fff R12: fffff520015a7200 R13: ffffc9000ad39000 R14: ffffc9000a53a000 R15: ffffc9000a53a000 FS: 0000000000000000(0000) GS:ffff88802d100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff520015a7200 CR3: 0000000052ea7000 CR4: 0000000000340ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. [View Less]

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dri-devel January 2020