[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 483.845635][ T8434] IPVS: ftp: loaded support on port[0] = 21 [ 716.302640][ T1640] INFO: task kworker/1:2:3281 blocked for more than 143 seconds. [ 716.310583][ T1640] Not tainted 5.11.0-rc7-syzkaller #0 [ 716.319247][ T1640] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.330127][ T1640] task:kworker/1:2 state:D stack:27560 pid: 3281 ppid: 2 flags:0x00004000 [ 716.340395][ T1640] Workqueue: ipv6_addrconf addrconf_verify_work [ 716.347807][ T1640] Call Trace: [ 716.351104][ T1640] __schedule+0x999/0xe70 [ 716.356926][ T1640] schedule+0x14b/0x200 [ 716.361094][ T1640] schedule_preempt_disabled+0xf/0x20 [ 716.367907][ T1640] __mutex_lock_common+0x124f/0x2f00 [ 716.374142][ T1640] ? addrconf_verify_work+0xa/0x20 [ 716.379278][ T1640] mutex_lock_nested+0x1a/0x20 [ 716.385481][ T1640] addrconf_verify_work+0xa/0x20 [ 716.390433][ T1640] process_one_work+0x789/0xfc0 [ 716.396770][ T1640] worker_thread+0xac1/0x1300 [ 716.401474][ T1640] ? __kthread_parkme+0x148/0x190 [ 716.407927][ T1640] ? rcu_lock_release+0x20/0x20 [ 716.413698][ T1640] kthread+0x39a/0x3c0 [ 716.417776][ T1640] ? rcu_lock_release+0x20/0x20 [ 716.424015][ T1640] ? kthread_blkcg+0xd0/0xd0 [ 716.428619][ T1640] ret_from_fork+0x1f/0x30 [ 716.434697][ T1640] [ 716.434697][ T1640] Showing all locks held in the system: [ 716.442415][ T1640] 1 lock held by khungtaskd/1640: [ 716.448872][ T1640] #0: ffffffff8c711680 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 716.460331][ T1640] 3 locks held by kworker/1:2/3281: [ 716.467409][ T1640] #0: ffff88814719c938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 [ 716.479545][ T1640] #1: ffffc9000230fd78 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 [ 716.490661][ T1640] #2: ffffffff8d6eed48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 716.501074][ T1640] 1 lock held by in:imklog/8113: [ 716.506905][ T1640] #0: ffff8880120c2d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 [ 716.517248][ T1640] 1 lock held by syz-executor186/8455: [ 716.523633][ T1640] [ 716.525967][ T1640] ============================================= [ 716.525967][ T1640] [ 716.535843][ T1640] NMI backtrace for cpu 0 [ 716.540169][ T1640] CPU: 0 PID: 1640 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 716.548507][ T1640] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.558556][ T1640] Call Trace: [ 716.561831][ T1640] dump_stack+0x137/0x1be [ 716.566238][ T1640] ? nmi_cpu_backtrace+0x94/0x190 [ 716.571267][ T1640] ? trace_vector_free_moved+0x1a0/0x1a0 [ 716.576936][ T1640] nmi_cpu_backtrace+0x16c/0x190 [ 716.581871][ T1640] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 716.587934][ T1640] nmi_trigger_cpumask_backtrace+0x191/0x2f0 [ 716.593913][ T1640] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 716.599999][ T1640] watchdog+0xce9/0xd30 [ 716.604233][ T1640] ? hungtask_pm_notify+0x50/0x50 [ 716.609253][ T1640] kthread+0x39a/0x3c0 [ 716.613317][ T1640] ? hungtask_pm_notify+0x50/0x50 [ 716.618335][ T1640] ? kthread_blkcg+0xd0/0xd0 [ 716.622920][ T1640] ret_from_fork+0x1f/0x30 [ 716.627500][ T1640] Sending NMI from CPU 0 to CPUs 1: [ 716.633426][ C1] NMI backtrace for cpu 1 [ 716.633432][ C1] CPU: 1 PID: 8455 Comm: syz-executor186 Not tainted 5.11.0-rc7-syzkaller #0 [ 716.633436][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.633440][ C1] RIP: 0010:__this_cpu_preempt_check+0x14/0x20 [ 716.633445][ C1] Code: 16 f8 e8 c1 18 a0 fa eb 96 e8 38 ed ff ff 0f 1f 84 00 00 00 00 00 53 48 89 fb 0f 1f 44 00 00 48 c7 c7 80 d3 0d 8a 48 89 de 5b 57 fe ff ff cc cc cc cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 [ 716.633451][ C1] RSP: 0018:ffffc9000141ef90 EFLAGS: 00000046 [ 716.633475][ C1] RAX: 1ffff1100296db97 RBX: ffff888014b6dcb8 RCX: dffffc0000000000 [ 716.633480][ C1] RDX: 0000000000000000 RSI: ffffffff89ae8b20 RDI: ffffffff8a0dd380 [ 716.633484][ C1] RBP: 9f82d52a8d2ea933 R08: dffffc0000000000 R09: fffffbfff1b6731e [ 716.633488][ C1] R10: fffffbfff1b6731e R11: 0000000000000000 R12: 0000000000000001 [ 716.633492][ C1] R13: 0000000000000246 R14: ffff888014b6dcf0 R15: ffff888014f76a68 [ 716.633496][ C1] FS: 0000000000b55300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 716.633514][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.633518][ C1] CR2: 00007f12df10b6c0 CR3: 000000001e228000 CR4: 00000000001506e0 [ 716.633522][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 716.633525][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 716.633528][ C1] Call Trace: [ 716.633531][ C1] lock_release+0x472/0x6b0 [ 716.633533][ C1] ? tcf_idr_check_alloc+0x9a/0x380 [ 716.633536][ C1] ? tcf_idr_check_alloc+0xa4/0x380 [ 716.633539][ C1] ? tcf_idr_check_alloc+0x9a/0x380 [ 716.633541][ C1] __mutex_unlock_slowpath+0x7b/0x520 [ 716.633544][ C1] tcf_idr_check_alloc+0x9a/0x380 [ 716.633547][ C1] tcf_police_init+0x1ce/0x1580 [ 716.633550][ C1] ? rcu_read_lock_sched_held+0x41/0xb0 [ 716.633552][ C1] ? tcf_police_search+0x40/0x40 [ 716.633555][ C1] tcf_action_init_1+0x40d/0xa80 [ 716.633558][ C1] ? rsvp_change+0x200/0x25f0 [ 716.633560][ C1] tcf_exts_validate+0xd6/0x370 [ 716.633563][ C1] rsvp_change+0x2c9/0x25f0 [ 716.633565][ C1] ? lockdep_rtnl_is_held+0x22/0x30 [ 716.633568][ C1] tc_new_tfilter+0x13ea/0x2d60 [ 716.633571][ C1] ? rsvp_get+0x3f0/0x3f0 [ 716.633573][ C1] ? tcf_gate_entry_destructor+0x20/0x20 [ 716.633576][ C1] rtnetlink_rcv_msg+0x8f9/0xd60 [ 716.633579][ C1] ? rcu_read_lock_sched_held+0x41/0xb0 [ 716.633582][ C1] netlink_rcv_skb+0x190/0x3a0 [ 716.633584][ C1] ? rtnetlink_bind+0x80/0x80 [ 716.633587][ C1] netlink_unicast+0x786/0x940 [ 716.633589][ C1] netlink_sendmsg+0x9ae/0xd50 [ 716.633592][ C1] ? netlink_getsockopt+0xa50/0xa50 [ 716.633594][ C1] ____sys_sendmsg+0x519/0x800 [ 716.633597][ C1] ? import_iovec+0xe6/0x120 [ 716.633600][ C1] __sys_sendmmsg+0x453/0x680 [ 716.633602][ C1] ? rcu_lock_release+0x9/0x20 [ 716.633605][ C1] ? rcu_read_lock_sched_held+0x41/0xb0 [ 716.633607][ C1] ? rcu_lock_release+0x9/0x20 [ 716.633610][ C1] ? syscall_enter_from_user_mode+0x24/0x190 [ 716.633613][ C1] __x64_sys_sendmmsg+0x9c/0xb0 [ 716.633616][ C1] do_syscall_64+0x2d/0x70 [ 716.633618][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.633621][ C1] RIP: 0033:0x440269 [ 716.633625][ C1] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 716.633631][ C1] RSP: 002b:00007fffec57fcb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 716.633638][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440269 [ 716.633641][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 716.633645][ C1] RBP: 0000000000000000 R08: 00000000004ab000 R09: 00000000004ab000 [ 716.633648][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffec57fcf0 [ 716.633652][ C1] R13: 00007fffec57fce0 R14: 00007fffec57fcd0 R15: 0000000000400488 [ 716.652550][ T1640] Kernel panic - not syncing: hung_task: blocked tasks [ 717.018641][ T1640] CPU: 0 PID: 1640 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 717.026961][ T1640] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.037011][ T1640] Call Trace: [ 717.040289][ T1640] dump_stack+0x137/0x1be [ 717.044631][ T1640] ? panic+0x1f3/0x800 [ 717.048791][ T1640] panic+0x291/0x800 [ 717.052683][ T1640] ? nmi_trigger_cpumask_backtrace+0x236/0x2f0 [ 717.058833][ T1640] ? nmi_trigger_cpumask_backtrace+0x29b/0x2f0 [ 717.064985][ T1640] ? nmi_trigger_cpumask_backtrace+0x236/0x2f0 [ 717.071148][ T1640] ? nmi_trigger_cpumask_backtrace+0x2a0/0x2f0 [ 717.077294][ T1640] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 717.083366][ T1640] watchdog+0xd29/0xd30 [ 717.087529][ T1640] ? hungtask_pm_notify+0x50/0x50 [ 717.092549][ T1640] kthread+0x39a/0x3c0 [ 717.096617][ T1640] ? hungtask_pm_notify+0x50/0x50 [ 717.101633][ T1640] ? kthread_blkcg+0xd0/0xd0 [ 717.106219][ T1640] ret_from_fork+0x1f/0x30 [ 717.111460][ T1640] Kernel Offset: disabled [ 717.115816][ T1640] Rebooting in 86400 seconds..