Hello,
syzbot found the following issue on:
HEAD commit: 0062442e Merge tag 'for-linus' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16584b81500000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9aa2432c01bcb1f dashboard link: https://syzkaller.appspot.com/bug?extid=a4edd73d589b0b7efbeb compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a4edd73d589b0b7efbeb@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: ffff888001000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD fc01067 P4D fc01067 PUD fc02067 PMD 80000000010001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 0 PID: 12457 Comm: syz-executor.5 Not tainted 5.10.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__writeq arch/x86/include/asm/io.h:98 [inline] RIP: 0010:bitfill_aligned drivers/video/fbdev/core/cfbfillrect.c:70 [inline] RIP: 0010:bitfill_aligned+0x11d/0x200 drivers/video/fbdev/core/cfbfillrect.c:35 Code: 41 83 fc 07 76 5f 4c 89 ed e8 bf 28 8a fd 48 89 5d 00 48 89 5d 08 48 89 5d 10 48 89 5d 18 48 89 5d 20 48 89 5d 28 48 8d 45 38 <48> 89 5d 30 48 83 c5 40 48 89 18 41 83 ef 08 bf 07 00 00 00 44 89 RSP: 0018:ffffc900082176d0 EFLAGS: 00010246 RAX: ffff888001000008 RBX: 0000000000000000 RCX: ffffc90013da2000 RDX: 0000000000040000 RSI: ffffffff83e60721 RDI: 0000000000000005 RBP: ffff888000ffffd0 R08: 0000000000001380 R09: 0000000000000040 R10: 0000000000000007 R11: 0000000000000000 R12: 000000000000004e R13: ffff888000ffff10 R14: 0000000000000000 R15: 0000000000000036 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0063) knlGS:00000000f5542b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: ffff888001000000 CR3: 000000001c7d6000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cfb_fillrect+0x40b/0x7b0 drivers/video/fbdev/core/cfbfillrect.c:327 vga16fb_fillrect+0x683/0x1940 drivers/video/fbdev/vga16fb.c:951 bit_clear_margins+0x3f6/0x4b0 drivers/video/fbdev/core/bitblit.c:224 fbcon_clear_margins+0x1f1/0x280 drivers/video/fbdev/core/fbcon.c:1325 fbcon_switch+0xafe/0x16b0 drivers/video/fbdev/core/fbcon.c:2187 redraw_screen+0x2b9/0x790 drivers/tty/vt/vt.c:1021 vc_do_resize+0xed8/0x1150 drivers/tty/vt/vt.c:1326 vt_resize+0xa3/0xe0 drivers/tty/vt/vt.c:1367 tiocswinsz drivers/tty/tty_io.c:2278 [inline] tty_ioctl+0x11a2/0x1600 drivers/tty/tty_io.c:2576 tty_compat_ioctl+0x295/0x410 drivers/tty/tty_io.c:2818 __do_compat_sys_ioctl+0x1d3/0x230 fs/ioctl.c:842 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f48549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f55420cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000005414 RDX: 0000000020000040 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: ffff888001000000 ---[ end trace 7c559c247d0f5502 ]--- RIP: 0010:__writeq arch/x86/include/asm/io.h:98 [inline] RIP: 0010:bitfill_aligned drivers/video/fbdev/core/cfbfillrect.c:70 [inline] RIP: 0010:bitfill_aligned+0x11d/0x200 drivers/video/fbdev/core/cfbfillrect.c:35 Code: 41 83 fc 07 76 5f 4c 89 ed e8 bf 28 8a fd 48 89 5d 00 48 89 5d 08 48 89 5d 10 48 89 5d 18 48 89 5d 20 48 89 5d 28 48 8d 45 38 <48> 89 5d 30 48 83 c5 40 48 89 18 41 83 ef 08 bf 07 00 00 00 44 89 RSP: 0018:ffffc900082176d0 EFLAGS: 00010246 RAX: ffff888001000008 RBX: 0000000000000000 RCX: ffffc90013da2000 RDX: 0000000000040000 RSI: ffffffff83e60721 RDI: 0000000000000005 RBP: ffff888000ffffd0 R08: 0000000000001380 R09: 0000000000000040 R10: 0000000000000007 R11: 0000000000000000 R12: 000000000000004e R13: ffff888000ffff10 R14: 0000000000000000 R15: 0000000000000036 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0063) knlGS:00000000f5542b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: ffff888001000000 CR3: 000000001c7d6000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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syzbot has found a reproducer for the following issue on:
HEAD commit: 2a987e65025e Merge tag 'perf-tools-fixes-for-v5.16-2021-12.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12f8fdc5b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7d5e878e3399b6cc dashboard link: https://syzkaller.appspot.com/bug?extid=a4edd73d589b0b7efbeb compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16671badb00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122beabdb00000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a4edd73d589b0b7efbeb@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: ffff888001000030 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD 11201067 P4D 11201067 PUD 11202067 PMD 80000000010001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6524 Comm: syz-executor260 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__writeq arch/x86/include/asm/io.h:98 [inline] RIP: 0010:bitfill_aligned+0x1d2/0x270 drivers/video/fbdev/core/cfbfillrect.c:75 Code: 39 1b fd eb 09 e8 3e 39 1b fd 48 83 c3 40 31 ff 89 ee e8 41 3d 1b fd 85 ed 74 2c 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 ff cd <4c> 89 33 85 ed 74 0b 48 83 c3 08 e8 0e 39 1b fd eb ec e8 07 39 1b RSP: 0018:ffffc90002b4ee38 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff888001000030 RCX: ffff888020209d00 RDX: ffff888020209d00 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff84695e4f R09: 0000000000000040 R10: 0000000000000002 R11: ffff888020209d00 R12: ffffffffffffffff R13: 0000000000000080 R14: 0000000000000000 R15: 0000000000000000 FS: 0000555555c14300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000030 CR3: 00000000708fb000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> cfb_fillrect+0x5d8/0x800 drivers/video/fbdev/core/cfbfillrect.c:327 bit_clear_margins+0x2d7/0x6e0 drivers/video/fbdev/core/bitblit.c:209 fbcon_clear_margins drivers/video/fbdev/core/fbcon.c:1296 [inline] fbcon_switch+0x1569/0x21f0 drivers/video/fbdev/core/fbcon.c:1677 redraw_screen+0x53d/0x1280 drivers/tty/vt/vt.c:1021 vc_do_resize+0x1361/0x1930 drivers/tty/vt/vt.c:1342 fbcon_do_set_font+0x9ef/0x10d0 drivers/video/fbdev/core/fbcon.c:1928 fbcon_set_font+0x9f9/0xc80 drivers/video/fbdev/core/fbcon.c:2014 con_font_set drivers/tty/vt/vt.c:4666 [inline] con_font_op+0xbcd/0x1080 drivers/tty/vt/vt.c:4710 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x1838/0x3860 drivers/tty/vt/vt_ioctl.c:752 tty_ioctl+0xfb2/0x17d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f44f1232229 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffb8c823a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f44f1232229 RDX: 0000000020000400 RSI: 0000000000004b72 RDI: 0000000000000004 RBP: 0000000000000000 R08: 000000000000000d R09: 00007fffb8c82548 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f44f11f5820 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: CR2: ffff888001000030 ---[ end trace 3cf2fa8eab0f5f7d ]--- RIP: 0010:__writeq arch/x86/include/asm/io.h:98 [inline] RIP: 0010:bitfill_aligned+0x1d2/0x270 drivers/video/fbdev/core/cfbfillrect.c:75 Code: 39 1b fd eb 09 e8 3e 39 1b fd 48 83 c3 40 31 ff 89 ee e8 41 3d 1b fd 85 ed 74 2c 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 ff cd <4c> 89 33 85 ed 74 0b 48 83 c3 08 e8 0e 39 1b fd eb ec e8 07 39 1b RSP: 0018:ffffc90002b4ee38 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff888001000030 RCX: ffff888020209d00 RDX: ffff888020209d00 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff84695e4f R09: 0000000000000040 R10: 0000000000000002 R11: ffff888020209d00 R12: ffffffffffffffff R13: 0000000000000080 R14: 0000000000000000 R15: 0000000000000000 FS: 0000555555c14300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000030 CR3: 00000000708fb000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 39 1b cmp %ebx,(%rbx) 2: fd std 3: eb 09 jmp 0xe 5: e8 3e 39 1b fd callq 0xfd1b3948 a: 48 83 c3 40 add $0x40,%rbx e: 31 ff xor %edi,%edi 10: 89 ee mov %ebp,%esi 12: e8 41 3d 1b fd callq 0xfd1b3d58 17: 85 ed test %ebp,%ebp 19: 74 2c je 0x47 1b: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 22: 00 00 00 25: 0f 1f 00 nopl (%rax) 28: ff cd dec %ebp * 2a: 4c 89 33 mov %r14,(%rbx) <-- trapping instruction 2d: 85 ed test %ebp,%ebp 2f: 74 0b je 0x3c 31: 48 83 c3 08 add $0x8,%rbx 35: e8 0e 39 1b fd callq 0xfd1b3948 3a: eb ec jmp 0x28 3c: e8 .byte 0xe8 3d: 07 (bad) 3e: 39 1b cmp %ebx,(%rbx)
syzbot suspects this issue was fixed by commit:
commit 0499f419b76f94ede08304aad5851144813ac55c Author: Javier Martinez Canillas javierm@redhat.com Date: Mon Jan 10 09:56:25 2022 +0000
video: vga16fb: Only probe for EGA and VGA 16 color graphic cards
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1752f5c0700000 start commit: 2a987e65025e Merge tag 'perf-tools-fixes-for-v5.16-2021-12.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=7d5e878e3399b6cc dashboard link: https://syzkaller.appspot.com/bug?extid=a4edd73d589b0b7efbeb syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16671badb00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122beabdb00000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: video: vga16fb: Only probe for EGA and VGA 16 color graphic cards
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
On Sat, 29 Jan 2022 at 15:07, syzbot syzbot+a4edd73d589b0b7efbeb@syzkaller.appspotmail.com wrote:
syzbot suspects this issue was fixed by commit:
commit 0499f419b76f94ede08304aad5851144813ac55c Author: Javier Martinez Canillas javierm@redhat.com Date: Mon Jan 10 09:56:25 2022 +0000
video: vga16fb: Only probe for EGA and VGA 16 color graphic cardsbisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1752f5c0700000 start commit: 2a987e65025e Merge tag 'perf-tools-fixes-for-v5.16-2021-12.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=7d5e878e3399b6cc dashboard link: https://syzkaller.appspot.com/bug?extid=a4edd73d589b0b7efbeb syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16671badb00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122beabdb00000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: video: vga16fb: Only probe for EGA and VGA 16 color graphic cards
Based on commit subject looks legit:
#syz fix: video: vga16fb: Only probe for EGA and VGA 16 color graphic cards
dri-devel@lists.freedesktop.org
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Dmitry Vyukov -
syzbot