Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 628.383467][ T6861] IPVS: ftp: loaded support on port[0] = 21 [ 780.097657][ T1143] INFO: task kworker/0:1:6853 blocked for more than 143 seconds. [ 780.105545][ T1143] Not tainted 5.9.0-rc6-syzkaller #0 [ 780.114989][ T1143] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.124694][ T1143] task:kworker/0:1 state:D stack:30176 pid: 6853 ppid: 2 flags:0x00004000 [ 780.134977][ T1143] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.142093][ T1143] Call Trace: [ 780.145495][ T1143] __schedule+0xec9/0x2280 [ 780.151173][ T1143] ? io_schedule_timeout+0x140/0x140 [ 780.156542][ T1143] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 780.163871][ T1143] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.169903][ T1143] ? lockdep_hardirqs_on+0x53/0x100 [ 780.175115][ T1143] schedule+0xd0/0x2a0 [ 780.180392][ T1143] schedule_preempt_disabled+0xf/0x20 [ 780.185771][ T1143] __mutex_lock+0x3e2/0x10e0 [ 780.191533][ T1143] ? addrconf_verify_work+0xa/0x20 [ 780.196657][ T1143] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.204440][ T1143] ? lock_release+0x8f0/0x8f0 [ 780.209880][ T1143] ? lock_downgrade+0x830/0x830 [ 780.214751][ T1143] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.221111][ T1143] ? lock_is_held_type+0xbb/0xf0 [ 780.226061][ T1143] addrconf_verify_work+0xa/0x20 [ 780.232301][ T1143] process_one_work+0x94c/0x1670 [ 780.237256][ T1143] ? lock_release+0x8f0/0x8f0 [ 780.244235][ T1143] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.250435][ T1143] ? rwlock_bug.part.0+0x90/0x90 [ 780.255384][ T1143] ? lockdep_hardirqs_off+0x96/0xd0 [ 780.261824][ T1143] worker_thread+0x64c/0x1120 [ 780.266574][ T1143] ? __kthread_parkme+0x13f/0x1e0 [ 780.272758][ T1143] ? process_one_work+0x1670/0x1670 [ 780.278760][ T1143] kthread+0x3b5/0x4a0 [ 780.282838][ T1143] ? __kthread_bind_mask+0xc0/0xc0 [ 780.289177][ T1143] ret_from_fork+0x1f/0x30 [ 780.293685][ T1143] [ 780.293685][ T1143] Showing all locks held in the system: [ 780.302645][ T1143] 1 lock held by khungtaskd/1143: [ 780.309238][ T1143] #0: ffffffff8a067f00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.320583][ T1143] 1 lock held by in:imklog/6551: [ 780.325518][ T1143] #0: ffff8880a92a3b70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.335968][ T1143] 3 locks held by kworker/0:1/6853: [ 780.341909][ T1143] #0: ffff88809a559138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 780.353799][ T1143] #1: ffffc90006547da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 780.365078][ T1143] #2: ffffffff8b14d648 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.376369][ T1143] 2 locks held by syz-executor237/6884: [ 780.382691][ T1143] [ 780.385016][ T1143] ============================================= [ 780.385016][ T1143] [ 780.394606][ T1143] NMI backtrace for cpu 0 [ 780.399050][ T1143] CPU: 0 PID: 1143 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 780.407278][ T1143] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.417324][ T1143] Call Trace: [ 780.420739][ T1143] dump_stack+0x198/0x1fd [ 780.425075][ T1143] nmi_cpu_backtrace.cold+0x70/0xb1 [ 780.430335][ T1143] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 780.435963][ T1143] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 780.441995][ T1143] watchdog+0xd7d/0x1000 [ 780.446241][ T1143] ? reset_hung_task_detector+0x30/0x30 [ 780.451789][ T1143] kthread+0x3b5/0x4a0 [ 780.455852][ T1143] ? __kthread_bind_mask+0xc0/0xc0 [ 780.460962][ T1143] ret_from_fork+0x1f/0x30 [ 780.465505][ T1143] Sending NMI from CPU 0 to CPUs 1: [ 780.471235][ C1] NMI backtrace for cpu 1 [ 780.471242][ C1] CPU: 1 PID: 3913 Comm: systemd-journal Not tainted 5.9.0-rc6-syzkaller #0 [ 780.471248][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.471252][ C1] RIP: 0010:link_path_walk.part.0+0x2a5/0xc20 [ 780.471264][ C1] Code: 49 01 dd 48 c1 cb 13 48 8d 1c db 49 bc 2f 2f 2f 2f 2f 2f 2f 2f e8 8b 88 b0 ff 31 ff 48 b8 d0 d0 d0 d0 d0 d0 d0 d0 4d 8b 3c 2e <48> b9 ff fe fe fe fe fe fe fe 4d 31 fc 4c 31 f8 49 01 cc 4c 89 fa [ 780.471268][ C1] RSP: 0018:ffffc900022f7a18 EFLAGS: 00000246 [ 780.471276][ C1] RAX: d0d0d0d0d0d0d0d0 RBX: ffff888098229c00 RCX: ffffffff81c5b53f [ 780.471281][ C1] RDX: ffff8880934a2080 RSI: ffffffff81c5b5b5 RDI: 0000000000000000 [ 780.471286][ C1] RBP: 0000000000000000 R08: 0000000000000002 R09: ffff888098229c70 [ 780.471291][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 2f2f2f2f2f2f2f2f [ 780.471296][ C1] R13: 0000000000000000 R14: ffff888095690ee9 R15: 2f6c616e72756f6a [ 780.471302][ C1] FS: 00007fda1a8fa8c0(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 780.471307][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 780.471312][ C1] CR2: 00007fda17c9a000 CR3: 000000009387d000 CR4: 00000000001506e0 [ 780.471317][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.471322][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.471324][ C1] Call Trace: [ 780.471328][ C1] ? walk_component+0x6a0/0x6a0 [ 780.471332][ C1] ? percpu_counter_add_batch+0x126/0x180 [ 780.471335][ C1] path_openat+0x25a/0x2730 [ 780.471338][ C1] ? path_lookupat+0x830/0x830 [ 780.471342][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.471346][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.471349][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.471353][ C1] do_filp_open+0x17e/0x3c0 [ 780.471356][ C1] ? may_open_dev+0xf0/0xf0 [ 780.471359][ C1] ? do_raw_spin_lock+0x120/0x2b0 [ 780.471363][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 780.471366][ C1] ? _raw_spin_unlock+0x24/0x40 [ 780.471369][ C1] ? __alloc_fd+0x28d/0x600 [ 780.471373][ C1] do_sys_openat2+0x16d/0x420 [ 780.471376][ C1] ? strncpy_from_user+0x2bf/0x3e0 [ 780.471380][ C1] ? build_open_flags+0x650/0x650 [ 780.471383][ C1] ? getname_flags.part.0+0x1dd/0x4f0 [ 780.471387][ C1] __x64_sys_open+0x119/0x1c0 [ 780.471390][ C1] ? do_sys_open+0x140/0x140 [ 780.471394][ C1] ? __secure_computing+0x104/0x360 [ 780.471397][ C1] do_syscall_64+0x2d/0x70 [ 780.471401][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.471404][ C1] RIP: 0033:0x7fda19e8a840 [ 780.471415][ C1] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 780.471419][ C1] RSP: 002b:00007fff9dc0bca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 780.471428][ C1] RAX: ffffffffffffffda RBX: 00007fff9dc0bfb0 RCX: 00007fda19e8a840 [ 780.471433][ C1] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005616ee569400 [ 780.471438][ C1] RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff [ 780.471444][ C1] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 780.471449][ C1] R13: 00005616ee55c040 R14: 00007fff9dc0bf70 R15: 00005616ee569220 [ 780.472998][ T1143] Kernel panic - not syncing: hung_task: blocked tasks [ 780.797048][ T1143] CPU: 0 PID: 1143 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 780.805272][ T1143] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.815326][ T1143] Call Trace: [ 780.818621][ T1143] dump_stack+0x198/0x1fd [ 780.823033][ T1143] panic+0x382/0x7fb [ 780.826928][ T1143] ? __warn_printk+0xf3/0xf3 [ 780.831516][ T1143] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 780.837141][ T1143] ? preempt_schedule_thunk+0x16/0x18 [ 780.842510][ T1143] ? watchdog.cold+0x5/0x16b [ 780.847093][ T1143] ? watchdog+0xa82/0x1000 [ 780.851515][ T1143] watchdog.cold+0x16/0x16b [ 780.856020][ T1143] ? reset_hung_task_detector+0x30/0x30 [ 780.861580][ T1143] kthread+0x3b5/0x4a0 [ 780.865651][ T1143] ? __kthread_bind_mask+0xc0/0xc0 [ 780.870766][ T1143] ret_from_fork+0x1f/0x30 [ 780.876791][ T1143] Kernel Offset: disabled [ 780.881118][ T1143] Rebooting in 86400 seconds..