[ 34.294320] audit: type=1800 audit(1546627776.611:28): pid=7285 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 34.809383] sshd (7350) used greatest stack depth: 19480 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.045871] audit: type=1800 audit(1546627777.451:29): pid=7285 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 35.065720] audit: type=1800 audit(1546627777.451:30): pid=7285 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.85' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 46.211408] WARNING: CPU: 0 PID: 7449 at drivers/media/common/videobuf2/videobuf2-core.c:1852 __vb2_queue_cancel+0x8f1/0xd30 [ 46.223560] Kernel panic - not syncing: panic_on_warn set ... [ 46.229595] CPU: 0 PID: 7449 Comm: syz-executor602 Not tainted 4.20.0+ #9 [ 46.236641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.246165] Call Trace: [ 46.248745] dump_stack+0x1db/0x2d0 [ 46.252709] ? dump_stack_print_info.cold+0x20/0x20 [ 46.257981] ? __vb2_queue_cancel+0x8c0/0xd30 [ 46.262469] panic+0x2cb/0x589 [ 46.265785] ? add_taint.cold+0x16/0x16 [ 46.270025] ? __vb2_queue_cancel+0x8f1/0xd30 [ 46.274648] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.280171] ? __probe_kernel_read+0x1f4/0x250 [ 46.284758] ? __warn.cold+0x5/0x4b [ 46.288503] ? __warn+0xe8/0x1d0 [ 46.291864] ? __vb2_queue_cancel+0x8f1/0xd30 [ 46.296338] __warn.cold+0x20/0x4b [ 46.299863] ? __vb2_queue_cancel+0x8f1/0xd30 [ 46.304342] report_bug+0x263/0x2b0 [ 46.307985] do_error_trap+0x11b/0x200 [ 46.312217] do_invalid_op+0x37/0x50 [ 46.316063] ? __vb2_queue_cancel+0x8f1/0xd30 [ 46.320819] invalid_op+0x14/0x20 [ 46.324491] RIP: 0010:__vb2_queue_cancel+0x8f1/0xd30 [ 46.329584] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 15 04 00 00 48 81 c4 18 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 1f 9b 3f fc <0f> 0b 49 8d 87 28 02 00 00 48 89 85 d0 fe ff ff 48 c1 e8 03 42 0f [ 46.349053] RSP: 0018:ffff88809e927938 EFLAGS: 00010293 [ 46.355965] RAX: ffff88809efd6400 RBX: ffff88809e927a50 RCX: ffffffff85425302 [ 46.364356] RDX: 0000000000000000 RSI: ffffffff85425a31 RDI: 0000000000000005 [ 46.371991] RBP: ffff88809e927a78 R08: ffff88809efd6400 R09: ffffed10430bce93 [ 46.379850] R10: ffffed10430bce92 R11: ffff8882185e7497 R12: ffff8882185e7494 [ 46.388266] R13: dffffc0000000000 R14: 0000000000000002 R15: ffff8882185e7250 [ 46.396275] ? __vb2_queue_cancel+0x1c2/0xd30 [ 46.400755] ? __vb2_queue_cancel+0x8f1/0xd30 [ 46.405416] ? __vb2_queue_cancel+0x8f1/0xd30 [ 46.410103] ? kasan_check_read+0x11/0x20 [ 46.414460] ? do_raw_spin_unlock+0xa0/0x330 [ 46.419000] ? vb2_buffer_done+0xc90/0xc90 [ 46.423336] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 46.428700] ? kasan_check_write+0x14/0x20 [ 46.433156] ? wake_up_q+0xaa/0x100 [ 46.436894] ? __mutex_unlock_slowpath+0x420/0x870 [ 46.441808] vb2_core_streamoff+0x60/0x140 [ 46.446316] __vb2_cleanup_fileio+0x78/0x170 [ 46.450832] vb2_core_queue_release+0x20/0x80 [ 46.455418] _vb2_fop_release+0x1cf/0x2a0 [ 46.459554] vb2_fop_release+0x75/0xc0 [ 46.463700] vivid_fop_release+0x18e/0x430 [ 46.468060] ? vivid_remove+0x460/0x460 [ 46.472013] v4l2_release+0x224/0x3a0 [ 46.475932] __fput+0x3c5/0xb10 [ 46.479198] ? dev_debug_store+0x150/0x150 [ 46.483415] ? get_max_files+0x20/0x20 [ 46.487415] ? task_work_run+0x1bb/0x2b0 [ 46.491465] ? trace_hardirqs_off_caller+0x300/0x300 [ 46.496696] ? do_raw_spin_trylock+0x270/0x270 [ 46.501421] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.506944] ____fput+0x16/0x20 [ 46.510326] task_work_run+0x1f4/0x2b0 [ 46.514538] ? task_work_cancel+0x2c0/0x2c0 [ 46.519011] ? __close_fd+0x25f/0x3d0 [ 46.522921] ? do_syscall_64+0x8c/0x800 [ 46.526884] exit_to_usermode_loop+0x32a/0x3b0 [ 46.531916] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.537451] ? syscall_trace_enter+0x12a0/0x12a0 [ 46.542305] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 46.547223] do_syscall_64+0x696/0x800 [ 46.551101] ? syscall_return_slowpath+0x5f0/0x5f0 [ 46.556157] ? prepare_exit_to_usermode+0x232/0x3b0 [ 46.561541] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.566650] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.571939] RIP: 0033:0x400ef0 [ 46.575259] Code: 01 f0 ff ff 0f 83 b0 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d dd 57 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 84 0a 00 00 c3 48 83 ec 08 e8 3a 01 00 00 [ 46.594501] RSP: 002b:00007fffd2323318 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 46.602619] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400ef0 [ 46.610094] RDX: 00000000fffffdf5 RSI: 0000000020000240 RDI: 0000000000000003 [ 46.617347] RBP: 0000000000000000 R08: 00000000009d2880 R09: 00000000004002e0 [ 46.624854] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401e00 [ 46.632231] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 46.641040] Kernel Offset: disabled [ 46.644855] Rebooting in 86400 seconds..