[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 65.340074][ T24] audit: type=1800 audit(1560381864.265:25): pid=8638 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 65.380015][ T24] audit: type=1800 audit(1560381864.265:26): pid=8638 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 65.434264][ T24] audit: type=1800 audit(1560381864.265:27): pid=8638 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 Warning: Permanently added '10.128.1.22' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 77.615310][ T8966] WARNING: CPU: 0 PID: 8966 at drivers/media/common/videobuf2/videobuf2-core.c:1882 __vb2_queue_cancel+0x8b6/0xc80 [ 77.627579][ T8966] Kernel panic - not syncing: panic_on_warn set ... [ 77.634174][ T8966] CPU: 0 PID: 8966 Comm: syz-executor829 Not tainted 5.2.0-rc4-next-20190612 #13 [ 77.643283][ T8966] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.653325][ T8966] Call Trace: [ 77.656610][ T8966] dump_stack+0x172/0x1f0 [ 77.660929][ T8966] ? __vb2_queue_cancel+0x840/0xc80 [ 77.666204][ T8966] panic+0x2cb/0x744 [ 77.670090][ T8966] ? __warn_printk+0xf3/0xf3 [ 77.674671][ T8966] ? __vb2_queue_cancel+0x8b6/0xc80 [ 77.680030][ T8966] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 77.686257][ T8966] ? __warn.cold+0x5/0x4d [ 77.690571][ T8966] ? __warn+0xe8/0x1d0 [ 77.694627][ T8966] ? __vb2_queue_cancel+0x8b6/0xc80 [ 77.699982][ T8966] __warn.cold+0x20/0x4d [ 77.704213][ T8966] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 77.710439][ T8966] ? __vb2_queue_cancel+0x8b6/0xc80 [ 77.715626][ T8966] report_bug+0x263/0x2b0 [ 77.719987][ T8966] do_error_trap+0x11b/0x200 [ 77.724587][ T8966] do_invalid_op+0x37/0x50 [ 77.729000][ T8966] ? __vb2_queue_cancel+0x8b6/0xc80 [ 77.734201][ T8966] invalid_op+0x14/0x20 [ 77.738392][ T8966] RIP: 0010:__vb2_queue_cancel+0x8b6/0xc80 [ 77.744183][ T8966] Code: 1e fb ff ff 48 89 df e8 28 50 ec fc e9 11 fb ff ff e8 1e 4a b3 fc 48 83 c4 50 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 0a 4a b3 fc <0f> 0b 48 8b 45 d0 48 05 28 02 00 00 48 89 c2 48 89 45 88 48 b8 00 [ 77.763783][ T8966] RSP: 0018:ffff88809fedf860 EFLAGS: 00010293 [ 77.769855][ T8966] RAX: ffff8880a81e6440 RBX: 0000000000000001 RCX: ffffffff84bdb0de [ 77.777811][ T8966] RDX: 0000000000000000 RSI: ffffffff84bdb876 RDI: 0000000000000005 [ 77.785787][ T8966] RBP: ffff88809fedf8d8 R08: ffff8880a81e6440 R09: ffffed104314ed26 [ 77.793743][ T8966] R10: ffffed104314ed25 R11: ffff888218a7692f R12: ffff888218a7692c [ 77.801782][ T8966] R13: ffff888218a769c0 R14: ffff888218a766e8 R15: ffff888218a723c8 [ 77.809766][ T8966] ? __vb2_queue_cancel+0x11e/0xc80 [ 77.815012][ T8966] ? __vb2_queue_cancel+0x8b6/0xc80 [ 77.820379][ T8966] ? v4l2_fh_is_singular+0xff/0x160 [ 77.825600][ T8966] vb2_core_streamoff+0x60/0x150 [ 77.830527][ T8966] __vb2_cleanup_fileio+0x78/0x170 [ 77.835622][ T8966] vb2_core_queue_release+0x20/0x80 [ 77.840849][ T8966] _vb2_fop_release+0x1cf/0x2a0 [ 77.845714][ T8966] vb2_fop_release+0x75/0xc0 [ 77.850294][ T8966] vivid_fop_release+0x18e/0x430 [ 77.855246][ T8966] ? vidioc_querycap+0x2d0/0x2d0 [ 77.860178][ T8966] v4l2_release+0x21f/0x390 [ 77.864685][ T8966] __fput+0x2ff/0x890 [ 77.868704][ T8966] ? dev_debug_store+0x110/0x110 [ 77.873650][ T8966] ____fput+0x16/0x20 [ 77.877630][ T8966] task_work_run+0x145/0x1c0 [ 77.882236][ T8966] do_exit+0x90a/0x2fa0 [ 77.886379][ T8966] ? get_signal+0x379/0x2490 [ 77.890963][ T8966] ? find_held_lock+0x35/0x130 [ 77.895716][ T8966] ? mm_update_next_owner+0x640/0x640 [ 77.901072][ T8966] ? lock_downgrade+0x920/0x920 [ 77.905915][ T8966] ? _raw_spin_unlock_irq+0x28/0x90 [ 77.911099][ T8966] ? get_signal+0x379/0x2490 [ 77.915670][ T8966] ? _raw_spin_unlock_irq+0x28/0x90 [ 77.920852][ T8966] do_group_exit+0x135/0x360 [ 77.925434][ T8966] get_signal+0x463/0x2490 [ 77.929849][ T8966] ? exit_robust_list+0x2c0/0x2c0 [ 77.934867][ T8966] ? mutex_unlock+0xd/0x10 [ 77.939267][ T8966] ? vb2_fop_read+0x1b7/0x410 [ 77.943932][ T8966] do_signal+0x87/0x1990 [ 77.948192][ T8966] ? __vfs_read+0x92/0x110 [ 77.952591][ T8966] ? v4l2_write+0x230/0x230 [ 77.957083][ T8966] ? setup_sigcontext+0x7d0/0x7d0 [ 77.962107][ T8966] ? exit_to_usermode_loop+0x43/0x2c0 [ 77.967463][ T8966] ? do_syscall_64+0x58e/0x680 [ 77.972227][ T8966] ? exit_to_usermode_loop+0x43/0x2c0 [ 77.977590][ T8966] ? lockdep_hardirqs_on+0x418/0x5d0 [ 77.982876][ T8966] ? trace_hardirqs_on+0x67/0x220 [ 77.987913][ T8966] exit_to_usermode_loop+0x244/0x2c0 [ 77.993198][ T8966] do_syscall_64+0x58e/0x680 [ 77.997867][ T8966] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.003745][ T8966] RIP: 0033:0x44a6b9 [ 78.007630][ T8966] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 7b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 78.027221][ T8966] RSP: 002b:00007fed3a247cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 78.035613][ T8966] RAX: fffffffffffffe00 RBX: 00000000006dbc38 RCX: 000000000044a6b9 [ 78.043566][ T8966] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc38 [ 78.051536][ T8966] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 78.059491][ T8966] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 78.067462][ T8966] R13: 00007ffe75863daf R14: 00007fed3a2489c0 R15: 0000000000000001 [ 78.076550][ T8966] Kernel Offset: disabled [ 78.080927][ T8966] Rebooting in 86400 seconds..