Hello,
syzbot found the following crash on:
HEAD commit: a16afaf7928b Merge tag 'for-v4.18' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1480e36f800000 kernel config: https://syzkaller.appspot.com/x/.config?x=314f2150f36c16ca dashboard link: https://syzkaller.appspot.com/bug?extid=55b1d9f811650de944c6 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=150b8abf800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1204efdf800000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+55b1d9f811650de944c6@syzkaller.appspotmail.com
1965969 pages RAM 0 pages HighMem/MovableOnly 340001 pages reserved ------------[ cut here ]------------ heap->ops->map_kernel should return ERR_PTR on error WARNING: CPU: 1 PID: 4564 at drivers/staging/android/ion/ion.c:148 ion_buffer_kmap_get drivers/staging/android/ion/ion.c:147 [inline] WARNING: CPU: 1 PID: 4564 at drivers/staging/android/ion/ion.c:148 ion_dma_buf_begin_cpu_access+0x48e/0x5a0 drivers/staging/android/ion/ion.c:328 Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 4564 Comm: syz-executor145 Not tainted 4.17.0+ #93 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 panic+0x22f/0x4de kernel/panic.c:184 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992 RIP: 0010:ion_buffer_kmap_get drivers/staging/android/ion/ion.c:147 [inline] RIP: 0010:ion_dma_buf_begin_cpu_access+0x48e/0x5a0 drivers/staging/android/ion/ion.c:328 Code: ff 41 bc ea ff ff ff 89 de e8 8e b0 ba fb 84 db 75 a8 e8 b5 af ba fb 48 c7 c7 00 05 68 88 c6 05 39 8d d9 03 01 e8 02 c7 86 fb <0f> 0b eb 8c 48 c7 c7 40 09 ef 88 e8 12 a3 f7 fb e9 15 ff ff ff e8 RSP: 0018:ffff8801ac87fb08 EFLAGS: 00010286 RAX: 0000000000000034 RBX: 0000000000000000 RCX: ffffffff816191ea RDX: 0000000000000000 RSI: ffffffff8161f4e1 RDI: ffff8801ac87f7e0 RBP: ffff8801ac87fb60 R08: ffff8801d8856480 R09: 0000000000000006 R10: ffff8801d8856480 R11: 0000000000000000 R12: 00000000ffffffea R13: ffff8801d977d148 R14: 0000000000000001 R15: ffffffff89724b80 dma_buf_begin_cpu_access+0x7f/0x160 drivers/dma-buf/dma-buf.c:823 dma_buf_ioctl+0x1aa/0x240 drivers/dma-buf/dma-buf.c:314 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1cf/0x16f0 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440479 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff6df8d2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440479 RDX: 0000000020fd3ff8 RSI: 0000000040086200 RDI: 0000000000000004 RBP: 00000000006cb018 R08: 0000000000000001 R09: 00007fff6df80031 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..
--- 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@googlegroups.com.
syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches