[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 44.456748][ T26] audit: type=1800 audit(1569081633.552:25): pid=7921 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[ 44.479615][ T26] audit: type=1800 audit(1569081633.562:26): pid=7921 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[ 44.500412][ T26] audit: type=1800 audit(1569081633.562:27): pid=7921 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.155' (ECDSA) to the list of known hosts.
syzkaller login: [ 382.903868][ T8071] IPVS: ftp: loaded support on port[0] = 21
[ 382.956942][ T8071] chnl_net:caif_netlink_parms(): no params data found
[ 382.984349][ T8071] bridge0: port 1(bridge_slave_0) entered blocking state
[ 382.993048][ T8071] bridge0: port 1(bridge_slave_0) entered disabled state
[ 383.001248][ T8071] device bridge_slave_0 entered promiscuous mode
[ 383.009720][ T8071] bridge0: port 2(bridge_slave_1) entered blocking state
[ 383.016843][ T8071] bridge0: port 2(bridge_slave_1) entered disabled state
[ 383.025256][ T8071] device bridge_slave_1 entered promiscuous mode
[ 383.040811][ T8071] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 383.051703][ T8071] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 383.070125][ T8071] team0: Port device team_slave_0 added
[ 383.077345][ T8071] team0: Port device team_slave_1 added
[ 383.159428][ T8071] device hsr_slave_0 entered promiscuous mode
[ 383.228184][ T8071] device hsr_slave_1 entered promiscuous mode
[ 383.304334][ T8071] bridge0: port 2(bridge_slave_1) entered blocking state
[ 383.311920][ T8071] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 383.319998][ T8071] bridge0: port 1(bridge_slave_0) entered blocking state
[ 383.327416][ T8071] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 383.358377][ T8071] 8021q: adding VLAN 0 to HW filter on device bond0
[ 383.369887][ T3509] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 383.390696][ T3509] bridge0: port 1(bridge_slave_0) entered disabled state
[ 383.400121][ T3509] bridge0: port 2(bridge_slave_1) entered disabled state
[ 383.410314][ T3509] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[ 383.422162][ T8071] 8021q: adding VLAN 0 to HW filter on device team0
[ 383.432971][ T8075] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[ 383.441989][ T8075] bridge0: port 1(bridge_slave_0) entered blocking state
[ 383.449619][ T8075] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 383.468797][ T8075] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[ 383.477144][ T8075] bridge0: port 2(bridge_slave_1) entered blocking state
[ 383.484419][ T8075] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 383.493636][ T8075] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[ 383.503027][ T8075] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[ 383.512431][ T8075] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[ 383.522396][ T8076] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[ 383.535837][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[ 383.546180][ T8071] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
executing program
[ 383.567296][ T8071] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 532.108006][ T1053] INFO: task syz-executor635:8085 blocked for more than 143 seconds.
[ 532.116650][ T1053] Not tainted 5.3.0+ #0
[ 532.121916][ T1053] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 532.130880][ T1053] syz-executor635 D27848 8085 8070 0x00004004
[ 532.137298][ T1053] Call Trace:
[ 532.140730][ T1053] __schedule+0x82e/0xc50
[ 532.145069][ T1053] schedule+0x131/0x1e0
[ 532.149281][ T1053] schedule_timeout+0x46/0x240
[ 532.154063][ T1053] do_wait_for_common+0x2e7/0x4d0
[ 532.159632][ T1053] ? console_conditional_schedule+0x40/0x40
[ 532.165621][ T1053] ? do_task_dead+0xc0/0xc0
[ 532.170410][ T1053] wait_for_completion+0x47/0x60
[ 532.175458][ T1053] __flush_work+0xd4/0x150
[ 532.180243][ T1053] ? start_flush_work+0x740/0x740
[ 532.185566][ T1053] __cancel_work_timer+0x420/0x570
[ 532.190984][ T1053] ? _raw_spin_unlock_irqrestore+0x77/0xe0
[ 532.196835][ T1053] cancel_work_sync+0x17/0x20
[ 532.201671][ T1053] p9_fd_close+0x297/0x3c0
[ 532.206096][ T1053] p9_client_create+0x974/0xee0
[ 532.211136][ T1053] ? __kasan_check_write+0x14/0x20
[ 532.217190][ T1053] v9fs_session_init+0x192/0x18e0
[ 532.222682][ T1053] ? __fs_reclaim_release+0x4/0x20
[ 532.227994][ T1053] ? check_preemption_disabled+0x47/0x2a0
[ 532.234972][ T1053] ? rcu_read_lock_sched_held+0x10b/0x170
[ 532.240846][ T1053] ? trace_kmalloc+0xcd/0x130
[ 532.245532][ T1053] ? kmem_cache_alloc_trace+0x23a/0x2f0
[ 532.251140][ T1053] v9fs_mount+0x82/0x860
[ 532.255464][ T1053] ? safesetid_security_capable+0x89/0xf0
[ 532.261436][ T1053] legacy_get_tree+0xf9/0x1a0
[ 532.266145][ T1053] ? xfs_fs_commit_blocks+0x660/0x660
[ 532.272156][ T1053] vfs_get_tree+0x8f/0x380
[ 532.277185][ T1053] do_mount+0x16c7/0x2510
[ 532.283432][ T1053] ? copy_mount_options+0x278/0x3c0
[ 532.289172][ T1053] ? copy_mount_options+0x25e/0x3c0
[ 532.294640][ T1053] ? copy_mount_options+0x267/0x3c0
[ 532.300196][ T1053] ? copy_mount_options+0x308/0x3c0
[ 532.305743][ T1053] ksys_mount+0xcc/0x100
[ 532.310064][ T1053] __x64_sys_mount+0xbf/0xd0
[ 532.315171][ T1053] do_syscall_64+0xf7/0x1c0
[ 532.319804][ T1053] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 532.325753][ T1053] RIP: 0033:0x447909
[ 532.329726][ T1053] Code: e8 5c 14 03 00 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 9b 0c fc ff c3 66 2e 0f 1f 84 00 00 00 00
[ 532.349477][ T1053] RSP: 002b:00007eff1aea0db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[ 532.358813][ T1053] RAX: ffffffffffffffda RBX: 00000000006ddc78 RCX: 0000000000447909
[ 532.366905][ T1053] RDX: 00000000200005c0 RSI: 0000000020000540 RDI: 0000000000000000
[ 532.375098][ T1053] RBP: 00000000006ddc70 R08: 0000000020000680 R09: 0000000000000000
[ 532.383395][ T1053] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc7c
[ 532.391621][ T1053] R13: 00007ffc4e6377ef R14: 00007eff1aea19c0 R15: 000000000000002d
[ 532.399665][ T1053]
[ 532.399665][ T1053] Showing all locks held in the system:
[ 532.407802][ T1053] 2 locks held by kworker/1:1/22:
[ 532.412827][ T1053] #0: ffff8880aa4278e8 ((wq_completion)events){+.+.}, at: process_one_work+0x75d/0x10e0
[ 532.423285][ T1053] #1: ffff8880a9a3fd78 ((work_completion)(&m->wq)){+.+.}, at: process_one_work+0x79f/0x10e0
[ 532.433622][ T1053] 1 lock held by khungtaskd/1053:
[ 532.438924][ T1053] #0: ffffffff888d3900 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30
[ 532.447884][ T1053] 1 lock held by rsyslogd/7959:
[ 532.452824][ T1053] #0: ffff8880a99f1e20 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0
[ 532.462554][ T1053] 2 locks held by getty/8049:
[ 532.467315][ T1053] #0: ffff8880a602d450 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70
[ 532.476658][ T1053] #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00
[ 532.486271][ T1053] 2 locks held by getty/8050:
[ 532.491261][ T1053] #0: ffff8880a902ac50 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70
[ 532.500523][ T1053] #1: ffffc90005f092e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00
[ 532.510116][ T1053] 2 locks held by getty/8051:
[ 532.514781][ T1053] #0: ffff88809c0f1750 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70
[ 532.524113][ T1053] #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00
[ 532.533865][ T1053] 2 locks held by getty/8052:
[ 532.538571][ T1053] #0: ffff88809e344b90 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70
[ 532.548361][ T1053] #1: ffffc90005f152e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00
[ 532.557986][ T1053] 2 locks held by getty/8053:
[ 532.562651][ T1053] #0: ffff88809e344310 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70
[ 532.571930][ T1053] #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00
[ 532.581617][ T1053] 2 locks held by getty/8054:
[ 532.586355][ T1053] #0: ffff88809c8aa410 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70
[ 532.595627][ T1053] #1: ffffc90005f2d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00
[ 532.605230][ T1053] 2 locks held by getty/8055:
[ 532.609944][ T1053] #0: ffff8880a0267310 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70
[ 532.619289][ T1053] #1: ffffc90005f012e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00
[ 532.628925][ T1053]
[ 532.631260][ T1053] =============================================
[ 532.631260][ T1053]
[ 532.639802][ T1053] NMI backtrace for cpu 0
[ 532.644131][ T1053] CPU: 0 PID: 1053 Comm: khungtaskd Not tainted 5.3.0+ #0
[ 532.651303][ T1053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 532.661341][ T1053] Call Trace:
[ 532.664670][ T1053] dump_stack+0x1d8/0x2f8
[ 532.668995][ T1053] nmi_cpu_backtrace+0xaf/0x1a0
[ 532.673828][ T1053] ? nmi_trigger_cpumask_backtrace+0x16d/0x290
[ 532.680008][ T1053] ? arch_trigger_cpumask_backtrace+0x20/0x20
[ 532.686072][ T1053] nmi_trigger_cpumask_backtrace+0x174/0x290
[ 532.692056][ T1053] arch_trigger_cpumask_backtrace+0x10/0x20
[ 532.698027][ T1053] trigger_all_cpu_backtrace+0x17/0x20
[ 532.703468][ T1053] watchdog+0xbb9/0xbd0
[ 532.707615][ T1053] kthread+0x332/0x350
[ 532.711666][ T1053] ? hungtask_pm_notify+0x50/0x50
[ 532.716671][ T1053] ? kthread_blkcg+0xe0/0xe0
[ 532.721244][ T1053] ret_from_fork+0x24/0x30
[ 532.725806][ T1053] Sending NMI from CPU 0 to CPUs 1:
[ 532.731452][ C1] NMI backtrace for cpu 1
[ 532.731455][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[ 532.731459][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 532.731462][ C1] RIP: 0010:check_preemption_disabled+0x6/0x2a0
[ 532.731468][ C1] Code: 90 90 90 90 55 48 89 e5 e8 a7 b2 2e fe 48 c7 c7 79 91 38 88 48 c7 c6 10 72 4e 88 e8 04 00 00 00 5d c3 66 90 55 48 89 e5 41 57 <41> 56 41 55 41 54 53 48 83 ec 10 49 89 f6 49 89 ff e8 74 b2 2e fe
[ 532.731471][ C1] RSP: 0018:ffff8880aeb09ee0 EFLAGS: 00000093
[ 532.731476][ C1] RAX: ffffffff83448fc9 RBX: 0000000000000004 RCX: ffff8880a98c2340
[ 532.731479][ C1] RDX: 0000000000000000 RSI: ffffffff884e7210 RDI: ffffffff88389179
[ 532.731482][ C1] RBP: ffff8880aeb09ee8 R08: ffffffff816701e0 R09: fffffbfff117c3cd
[ 532.731485][ C1] R10: fffffbfff117c3cd R11: 0000000000000000 R12: 1ffff11015d64eaf
[ 532.731488][ C1] R13: ffff8880aeb00000 R14: dffffc0000000000 R15: ffff8880aeb2757c
[ 532.731491][ C1] FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
[ 532.731494][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 532.731497][ C1] CR2: ffffffffff600400 CR3: 00000000a3d38000 CR4: 00000000001406e0
[ 532.731500][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 532.731503][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 532.731505][ C1] Call Trace:
[ 532.731507][ C1] <IRQ>
[ 532.731509][ C1] debug_smp_processor_id+0x1c/0x20
[ 532.731511][ C1] tick_irq_enter+0xbd/0x3e0
[ 532.731513][ C1] irq_enter+0x52/0xc0
[ 532.731515][ C1] scheduler_ipi+0xb3/0x4a0
[ 532.731517][ C1] smp_reschedule_interrupt+0x7a/0xa0
[ 532.731519][ C1] reschedule_interrupt+0xf/0x20
[ 532.731521][ C1] </IRQ>
[ 532.731523][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 532.731529][ C1] Code: 3c fa eb ae 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 94 ab 3c fa eb b0 90 90 e9 07 00 00 00 0f 00 2d b6 99 52 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d a6 99 52 00 f4 c3 90 90 55 48 89 e5
[ 532.731531][ C1] RSP: 0018:ffff8880a98cfe10 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02
[ 532.731536][ C1] RAX: 1ffffffff1115179 RBX: ffff8880a98c2340 RCX: dffffc0000000000
[ 532.731539][ C1] RDX: 0000000000000000 RSI: ffffffff812ba81a RDI: ffff8880a98c2b80
[ 532.731542][ C1] RBP: ffff8880a98cfe18 R08: ffff8880a98c2b98 R09: ffffed1015318469
[ 532.731545][ C1] R10: ffffed1015318469 R11: 0000000000000000 R12: dffffc0000000000
[ 532.731547][ C1] R13: 1ffff11015318468 R14: dffffc0000000000 R15: 1ffffffff1115177
[ 532.731549][ C1] ? arch_cpu_idle+0xa/0x10
[ 532.731551][ C1] ? default_idle+0x50/0x70
[ 532.731553][ C1] arch_cpu_idle+0xa/0x10
[ 532.731555][ C1] default_idle_call+0x59/0xa0
[ 532.731557][ C1] do_idle+0x140/0x670
[ 532.731559][ C1] cpu_startup_entry+0x25/0x30
[ 532.731561][ C1] start_secondary+0x384/0x410
[ 532.731563][ C1] secondary_startup_64+0xa4/0xb0
[ 532.732723][ T1053] Kernel panic - not syncing: hung_task: blocked tasks
[ 533.019753][ T1053] CPU: 0 PID: 1053 Comm: khungtaskd Not tainted 5.3.0+ #0
[ 533.026904][ T1053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 533.036944][ T1053] Call Trace:
[ 533.040219][ T1053] dump_stack+0x1d8/0x2f8
[ 533.044586][ T1053] panic+0x25c/0x799
[ 533.048480][ T1053] ? nmi_trigger_cpumask_backtrace+0x21a/0x290
[ 533.054616][ T1053] watchdog+0xbcc/0xbd0
[ 533.058756][ T1053] kthread+0x332/0x350
[ 533.062823][ T1053] ? hungtask_pm_notify+0x50/0x50
[ 533.067839][ T1053] ? kthread_blkcg+0xe0/0xe0
[ 533.072411][ T1053] ret_from_fork+0x24/0x30
[ 533.078509][ T1053] Kernel Offset: disabled
[ 533.082847][ T1053] Rebooting in 86400 seconds..