[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.562213] audit: type=1800 audit(1546534100.605:25): pid=7930 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.590436] audit: type=1800 audit(1546534100.605:26): pid=7930 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.624909] audit: type=1800 audit(1546534100.605:27): pid=7930 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 46.123916] sshd (8067) used greatest stack depth: 19848 bytes left Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program [ 52.713518] WARNING: CPU: 1 PID: 8091 at drivers/media/common/videobuf2/videobuf2-core.c:1852 __vb2_queue_cancel+0x8f1/0xd30 [ 52.725087] Kernel panic - not syncing: panic_on_warn set ... [ 52.731154] CPU: 1 PID: 8091 Comm: syz-executor648 Not tainted 4.20.0+ #7 [ 52.738091] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.747566] Call Trace: [ 52.750156] dump_stack+0x1db/0x2d0 [ 52.753776] ? dump_stack_print_info.cold+0x20/0x20 [ 52.758788] ? __vb2_queue_cancel+0x8e0/0xd30 [ 52.763387] panic+0x2cb/0x589 [ 52.766574] ? add_taint.cold+0x16/0x16 [ 52.770540] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.775301] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.780836] ? __probe_kernel_read+0x1f4/0x250 [ 52.785433] ? __warn.cold+0x5/0x4b [ 52.789325] ? __warn+0xe8/0x1d0 [ 52.792804] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.797416] __warn.cold+0x20/0x4b [ 52.800953] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.805463] report_bug+0x263/0x2b0 [ 52.809104] do_error_trap+0x11b/0x200 [ 52.813203] do_invalid_op+0x37/0x50 [ 52.816913] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.821406] invalid_op+0x14/0x20 [ 52.825040] RIP: 0010:__vb2_queue_cancel+0x8f1/0xd30 [ 52.830230] 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 5f b5 3f fc <0f> 0b 49 8d 87 28 02 00 00 48 89 85 d0 fe ff ff 48 c1 e8 03 42 0f [ 52.849430] RSP: 0018:ffff888089877938 EFLAGS: 00010293 [ 52.854918] RAX: ffff8880a846a540 RBX: ffff888089877a50 RCX: ffffffff8541d9e2 [ 52.862439] RDX: 0000000000000000 RSI: ffffffff8541e111 RDI: 0000000000000005 [ 52.869810] RBP: ffff888089877a78 R08: ffff8880a846a540 R09: ffffed1043178e8b [ 52.877187] R10: ffffed1043178e8a R11: ffff888218bc7457 R12: ffff888218bc7454 [ 52.884544] R13: dffffc0000000000 R14: 0000000000000002 R15: ffff888218bc7210 [ 52.891830] ? __vb2_queue_cancel+0x1c2/0xd30 [ 52.896317] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.900819] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.905563] ? kasan_check_read+0x11/0x20 [ 52.909711] ? do_raw_spin_unlock+0xa0/0x330 [ 52.914207] ? vb2_buffer_done+0xc90/0xc90 [ 52.918518] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 52.923625] ? kasan_check_write+0x14/0x20 [ 52.927860] ? wake_up_q+0xaa/0x100 [ 52.931487] ? __mutex_unlock_slowpath+0x420/0x870 [ 52.936527] vb2_core_streamoff+0x60/0x140 [ 52.940880] __vb2_cleanup_fileio+0x78/0x170 [ 52.945353] vb2_core_queue_release+0x20/0x80 [ 52.950210] _vb2_fop_release+0x1cf/0x2a0 [ 52.954352] vb2_fop_release+0x75/0xc0 [ 52.958239] vivid_fop_release+0x18e/0x430 [ 52.962471] ? vivid_remove+0x460/0x460 [ 52.966554] v4l2_release+0x224/0x3a0 [ 52.970354] __fput+0x3c5/0xb10 [ 52.973629] ? dev_debug_store+0x150/0x150 [ 52.977968] ? get_max_files+0x20/0x20 [ 52.981856] ? task_work_run+0x1bb/0x2b0 [ 52.985910] ? trace_hardirqs_off_caller+0x300/0x300 [ 52.991121] ? do_raw_spin_trylock+0x270/0x270 [ 52.995809] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.001582] ____fput+0x16/0x20 [ 53.005166] task_work_run+0x1f4/0x2b0 [ 53.009174] ? task_work_cancel+0x2c0/0x2c0 [ 53.013660] ? __close_fd+0x25f/0x3d0 [ 53.017614] ? do_syscall_64+0x8c/0x800 [ 53.021591] exit_to_usermode_loop+0x32a/0x3b0 [ 53.026173] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.031529] ? syscall_trace_enter+0x12a0/0x12a0 [ 53.037137] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.041892] do_syscall_64+0x696/0x800 [ 53.045775] ? syscall_return_slowpath+0x5f0/0x5f0 [ 53.050701] ? prepare_exit_to_usermode+0x232/0x3b0 [ 53.055722] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.060565] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.065859] RIP: 0033:0x400ef0 [ 53.069184] 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 [ 53.088410] RSP: 002b:00007ffd9d30bb88 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 53.096130] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400ef0 [ 53.103405] RDX: 00000000fffffdf5 RSI: 0000000020000240 RDI: 0000000000000003 [ 53.110669] RBP: 0000000000000000 R08: 0000000000a67880 R09: 00000000004002e0 [ 53.117933] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401e00 [ 53.125205] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 53.134194] Kernel Offset: disabled [ 53.137986] Rebooting in 86400 seconds..