[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 43.256492] audit: type=1800 audit(1547662204.700:25): pid=7896 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 43.276194] audit: type=1800 audit(1547662204.710:26): pid=7896 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 43.303957] audit: type=1800 audit(1547662204.710:27): pid=7896 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 Warning: Permanently added '10.128.0.150' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 54.414205] WARNING: CPU: 1 PID: 8060 at drivers/media/common/videobuf2/videobuf2-core.c:1852 __vb2_queue_cancel+0x8f1/0xd30 [ 54.425669] Kernel panic - not syncing: panic_on_warn set ... [ 54.431550] CPU: 1 PID: 8060 Comm: syz-executor901 Not tainted 5.0.0-rc2+ #29 [ 54.438827] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.448168] Call Trace: [ 54.450760] dump_stack+0x1db/0x2d0 [ 54.454392] ? dump_stack_print_info.cold+0x20/0x20 [ 54.459403] ? __vb2_queue_cancel+0x880/0xd30 [ 54.463888] panic+0x2cb/0x65c [ 54.467068] ? add_taint.cold+0x16/0x16 [ 54.471034] ? __vb2_queue_cancel+0x8f1/0xd30 [ 54.475515] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.481038] ? __probe_kernel_read+0x1f4/0x250 [ 54.485610] ? __warn.cold+0x5/0x48 [ 54.489222] ? __warn+0xe8/0x1d0 [ 54.492578] ? __vb2_queue_cancel+0x8f1/0xd30 [ 54.497059] __warn.cold+0x20/0x48 [ 54.500586] ? __vb2_queue_cancel+0x8f1/0xd30 [ 54.505072] report_bug+0x263/0x2b0 [ 54.508694] do_error_trap+0x11b/0x200 [ 54.512589] do_invalid_op+0x37/0x50 [ 54.516306] ? __vb2_queue_cancel+0x8f1/0xd30 [ 54.520807] invalid_op+0x14/0x20 [ 54.524260] RIP: 0010:__vb2_queue_cancel+0x8f1/0xd30 [ 54.529347] 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 7f 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 [ 54.548243] RSP: 0018:ffff88808f1af938 EFLAGS: 00010293 [ 54.553604] RAX: ffff888091f42480 RBX: ffff88808f1afa50 RCX: ffffffff85425c42 [ 54.560872] RDX: 0000000000000000 RSI: ffffffff85426371 RDI: 0000000000000005 [ 54.568140] RBP: ffff88808f1afa78 R08: ffff888091f42480 R09: ffffed10430e6ce1 [ 54.575396] R10: ffffed10430e6ce0 R11: ffff888218736707 R12: ffff888218736704 [ 54.582655] R13: dffffc0000000000 R14: 0000000000000002 R15: ffff8882187364c0 [ 54.589930] ? __vb2_queue_cancel+0x1c2/0xd30 [ 54.594416] ? __vb2_queue_cancel+0x8f1/0xd30 [ 54.598903] ? __vb2_queue_cancel+0x8f1/0xd30 [ 54.603386] ? kasan_check_read+0x11/0x20 [ 54.607523] ? do_raw_spin_unlock+0xa0/0x330 [ 54.611922] ? vb2_buffer_done+0xc90/0xc90 [ 54.616146] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 54.621249] ? kasan_check_write+0x14/0x20 [ 54.625475] ? wake_up_q+0xaa/0x100 [ 54.629104] ? __mutex_unlock_slowpath+0x420/0x870 [ 54.634043] vb2_core_streamoff+0x60/0x140 [ 54.638272] __vb2_cleanup_fileio+0x78/0x170 [ 54.642686] vb2_core_queue_release+0x20/0x80 [ 54.647175] _vb2_fop_release+0x1cf/0x2a0 [ 54.651336] vb2_fop_release+0x75/0xc0 [ 54.655228] vivid_fop_release+0x18e/0x430 [ 54.659451] ? vivid_remove+0x460/0x460 [ 54.663412] v4l2_release+0x224/0x3a0 [ 54.667205] __fput+0x3c5/0xb10 [ 54.670475] ? dev_debug_store+0x150/0x150 [ 54.674699] ? get_max_files+0x20/0x20 [ 54.678575] ? task_work_run+0x1bb/0x2b0 [ 54.682634] ? trace_hardirqs_off_caller+0x300/0x300 [ 54.687721] ? do_raw_spin_trylock+0x270/0x270 [ 54.692294] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.697831] ____fput+0x16/0x20 [ 54.701101] task_work_run+0x1f4/0x2b0 [ 54.704978] ? task_work_cancel+0x2c0/0x2c0 [ 54.709297] ? __close_fd+0x25f/0x3d0 [ 54.713095] ? do_syscall_64+0x8c/0x800 [ 54.717058] exit_to_usermode_loop+0x32a/0x3b0 [ 54.721646] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.727009] ? syscall_trace_enter+0x12a0/0x12a0 [ 54.731755] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 54.736501] do_syscall_64+0x696/0x800 [ 54.740378] ? syscall_return_slowpath+0x5f0/0x5f0 [ 54.745295] ? prepare_exit_to_usermode+0x232/0x3b0 [ 54.750315] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.755163] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.760345] RIP: 0033:0x400ef0 [ 54.763527] 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 [ 54.782435] RSP: 002b:00007ffd5d72f298 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 54.790141] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400ef0 [ 54.797404] RDX: 00000000000ca800 RSI: 0000000020000000 RDI: 0000000000000003 [ 54.804662] RBP: 0000000000000000 R08: 000000000070f880 R09: 00000000004002e0 [ 54.811936] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401e00 [ 54.819201] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 54.827572] Kernel Offset: disabled [ 54.831245] Rebooting in 86400 seconds..