[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.379601][ T26] audit: type=1800 audit(1548749313.163:25): pid=8044 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 42.416962][ T26] audit: type=1800 audit(1548749313.173:26): pid=8044 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 42.444659][ T26] audit: type=1800 audit(1548749313.173:27): pid=8044 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 '10.128.0.205' (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 syzkaller login: [ 53.252160][ T3472] WARNING: CPU: 1 PID: 3472 at kernel/workqueue.c:2911 __flush_work+0x880/0xa60 [ 53.261233][ T3472] Kernel panic - not syncing: panic_on_warn set ... [ 53.267817][ T3472] CPU: 1 PID: 3472 Comm: kworker/1:2 Not tainted 5.0.0-rc4-next-20190129 #21 [ 53.276547][ T3472] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.286586][ T3472] Workqueue: md_misc mddev_delayed_delete [ 53.292275][ T3472] Call Trace: [ 53.295537][ T3472] dump_stack+0x1db/0x2d0 [ 53.299868][ T3472] ? dump_stack_print_info.cold+0x20/0x20 [ 53.305569][ T3472] ? __flush_work+0x7c0/0xa60 [ 53.310240][ T3472] panic+0x2cb/0x65c [ 53.314115][ T3472] ? add_taint.cold+0x16/0x16 [ 53.318777][ T3472] ? __flush_work+0x880/0xa60 [ 53.323449][ T3472] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.329664][ T3472] ? __probe_kernel_read+0x1f4/0x250 [ 53.334925][ T3472] ? __warn.cold+0x5/0x48 [ 53.339230][ T3472] ? __warn+0xe8/0x1d0 [ 53.343279][ T3472] ? __flush_work+0x880/0xa60 [ 53.347930][ T3472] __warn.cold+0x20/0x48 [ 53.352150][ T3472] ? __flush_work+0x880/0xa60 [ 53.356809][ T3472] report_bug+0x263/0x2b0 [ 53.361127][ T3472] do_error_trap+0x11b/0x200 [ 53.365696][ T3472] do_invalid_op+0x37/0x50 [ 53.370087][ T3472] ? __flush_work+0x880/0xa60 [ 53.374740][ T3472] invalid_op+0x14/0x20 [ 53.378870][ T3472] RIP: 0010:__flush_work+0x880/0xa60 [ 53.384127][ T3472] Code: 74 58 e8 93 54 2e 00 fb 66 0f 1f 44 00 00 45 31 e4 e9 7d fd ff ff e8 7f 54 2e 00 0f 0b 45 31 e4 e9 6e fd ff ff e8 70 54 2e 00 <0f> 0b 45 31 e4 e9 5f fd ff ff e8 61 54 2e 00 4c 89 ff 45 31 e4 e8 [ 53.403718][ T3472] RSP: 0018:ffff88809acb7558 EFLAGS: 00010293 [ 53.409753][ T3472] RAX: ffff88809acc4580 RBX: ffff88809acb76e8 RCX: ffffffff8153bde9 [ 53.417695][ T3472] RDX: 0000000000000000 RSI: ffffffff8153c5c0 RDI: 0000000000000001 [ 53.425655][ T3472] RBP: ffff88809acb7710 R08: ffff88809acc4580 R09: ffff88809acc4e48 [ 53.433604][ T3472] R10: ffff88809acc4580 R11: 0000000000000000 R12: ffff88809dd24628 [ 53.441547][ T3472] R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000001 [ 53.449503][ T3472] ? __flush_work+0xa9/0xa60 [ 53.454069][ T3472] ? __flush_work+0x880/0xa60 [ 53.458725][ T3472] ? __flush_work+0x880/0xa60 [ 53.463381][ T3472] ? print_usage_bug+0xd0/0xd0 [ 53.468123][ T3472] ? insert_work+0x620/0x620 [ 53.472688][ T3472] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 53.478912][ T3472] ? mark_held_locks+0xa4/0xf0 [ 53.483653][ T3472] ? __cancel_work_timer+0x235/0x810 [ 53.488915][ T3472] ? __cancel_work_timer+0x235/0x810 [ 53.494175][ T3472] ? lockdep_hardirqs_on+0x418/0x5d0 [ 53.499435][ T3472] ? trace_hardirqs_on+0xbd/0x310 [ 53.504437][ T3472] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.510653][ T3472] ? cancel_work_sync+0x18/0x20 [ 53.515494][ T3472] ? trace_hardirqs_off_caller+0x300/0x300 [ 53.521277][ T3472] ? need_to_create_worker+0x260/0x260 [ 53.526728][ T3472] ? find_held_lock+0x35/0x120 [ 53.531470][ T3472] __cancel_work_timer+0x48d/0x810 [ 53.536560][ T3472] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 53.542343][ T3472] ? try_to_grab_pending+0x9d0/0x9d0 [ 53.547601][ T3472] ? trace_hardirqs_on+0xbd/0x310 [ 53.552601][ T3472] ? kasan_check_read+0x11/0x20 [ 53.557427][ T3472] ? trace_hardirqs_off_caller+0x300/0x300 [ 53.563207][ T3472] ? do_raw_spin_trylock+0x270/0x270 [ 53.568465][ T3472] ? stub_timer+0x10/0x10 [ 53.572770][ T3472] ? mark_held_locks+0xa4/0xf0 [ 53.577529][ T3472] ? del_timer_sync+0xf1/0x290 [ 53.582273][ T3472] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 53.588057][ T3472] ? try_to_del_timer_sync+0xec/0x140 [ 53.593406][ T3472] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 53.599295][ T3472] ? try_to_del_timer_sync+0xec/0x140 [ 53.604663][ T3472] cancel_work_sync+0x18/0x20 [ 53.609337][ T3472] blk_sync_queue+0x33/0x190 [ 53.613923][ T3472] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.620144][ T3472] blk_cleanup_queue+0x100/0x200 [ 53.625074][ T3472] md_free+0xcb/0x1b0 [ 53.629037][ T3472] kobject_put.cold+0x28f/0x2ec [ 53.633896][ T3472] mddev_delayed_delete+0x34/0x40 [ 53.638914][ T3472] process_one_work+0xd0c/0x1ce0 [ 53.643831][ T3472] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 53.650653][ T3472] ? __switch_to_asm+0x34/0x70 [ 53.655416][ T3472] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 53.660762][ T3472] ? __schedule+0x89f/0x1e60 [ 53.665332][ T3472] ? pci_mmcfg_check_reserved+0x170/0x170 [ 53.671028][ T3472] ? lockdep_hardirqs_on+0x418/0x5d0 [ 53.676288][ T3472] ? worker_thread+0x3b7/0x14a0 [ 53.681114][ T3472] ? find_held_lock+0x35/0x120 [ 53.685857][ T3472] ? lock_acquire+0x1db/0x570 [ 53.690523][ T3472] ? worker_thread+0x3cd/0x14a0 [ 53.695353][ T3472] ? kasan_check_write+0x14/0x20 [ 53.700278][ T3472] ? do_raw_spin_lock+0x156/0x360 [ 53.705279][ T3472] ? lock_release+0xc40/0xc40 [ 53.709931][ T3472] ? rwlock_bug.part.0+0x90/0x90 [ 53.714843][ T3472] ? trace_hardirqs_on_caller+0x310/0x310 [ 53.720545][ T3472] worker_thread+0x143/0x14a0 [ 53.725206][ T3472] ? process_one_work+0x1ce0/0x1ce0 [ 53.730376][ T3472] ? __kthread_parkme+0xc3/0x1b0 [ 53.735290][ T3472] ? lock_acquire+0x1db/0x570 [ 53.739944][ T3472] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 53.745724][ T3472] ? lockdep_hardirqs_on+0x418/0x5d0 [ 53.750987][ T3472] ? trace_hardirqs_on+0xbd/0x310 [ 53.755987][ T3472] ? __kthread_parkme+0xc3/0x1b0 [ 53.760898][ T3472] ? trace_hardirqs_off_caller+0x300/0x300 [ 53.766676][ T3472] ? do_raw_spin_trylock+0x270/0x270 [ 53.771936][ T3472] ? schedule+0x108/0x350 [ 53.776241][ T3472] ? do_raw_spin_trylock+0x270/0x270 [ 53.781505][ T3472] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 53.787288][ T3472] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 53.793508][ T3472] ? __kthread_parkme+0xfb/0x1b0 [ 53.798595][ T3472] kthread+0x357/0x430 [ 53.802640][ T3472] ? process_one_work+0x1ce0/0x1ce0 [ 53.807827][ T3472] ? kthread_stop+0x920/0x920 [ 53.812483][ T3472] ret_from_fork+0x3a/0x50 [ 53.817977][ T3472] Kernel Offset: disabled [ 53.822360][ T3472] Rebooting in 86400 seconds..