[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.74' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 501.125930][ T6904] IPVS: ftp: loaded support on port[0] = 21 executing program [ 501.168973][ T6925] netlink: 388 bytes leftover after parsing attributes in process `syz-executor300'. [ 501.187344][ T6926] netlink: 388 bytes leftover after parsing attributes in process `syz-executor300'. [ 657.223158][ T1170] INFO: task kworker/0:0:6896 blocked for more than 143 seconds. [ 657.231064][ T1170] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.240564][ T1170] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.250240][ T1170] task:kworker/0:0 state:D stack:29480 pid: 6896 ppid: 2 flags:0x00004000 [ 657.260478][ T1170] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.267594][ T1170] Call Trace: [ 657.270952][ T1170] __schedule+0xec9/0x2280 [ 657.276548][ T1170] ? io_schedule_timeout+0x140/0x140 [ 657.281929][ T1170] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.289156][ T1170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.295130][ T1170] ? lockdep_hardirqs_on+0x53/0x100 [ 657.300342][ T1170] schedule+0xd0/0x2a0 [ 657.305797][ T1170] schedule_preempt_disabled+0xf/0x20 [ 657.311170][ T1170] __mutex_lock+0x3e2/0x10e0 [ 657.317984][ T1170] ? addrconf_verify_work+0xa/0x20 [ 657.323886][ T1170] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.329266][ T1170] ? lock_release+0x8f0/0x8f0 [ 657.336016][ T1170] ? lock_downgrade+0x830/0x830 [ 657.340879][ T1170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.347170][ T1170] ? lock_is_held_type+0xbb/0xf0 [ 657.352120][ T1170] addrconf_verify_work+0xa/0x20 [ 657.358265][ T1170] process_one_work+0x94c/0x1670 [ 657.364041][ T1170] ? lock_release+0x8f0/0x8f0 [ 657.368729][ T1170] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.375201][ T1170] ? rwlock_bug.part.0+0x90/0x90 [ 657.380146][ T1170] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.386522][ T1170] worker_thread+0x64c/0x1120 [ 657.391216][ T1170] ? __kthread_parkme+0x13f/0x1e0 [ 657.397375][ T1170] ? process_one_work+0x1670/0x1670 [ 657.402579][ T1170] kthread+0x3b5/0x4a0 [ 657.407908][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 657.413787][ T1170] ret_from_fork+0x1f/0x30 [ 657.418287][ T1170] [ 657.418287][ T1170] Showing all locks held in the system: [ 657.427358][ T1170] 1 lock held by khungtaskd/1170: [ 657.432377][ T1170] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.445327][ T1170] 1 lock held by in:imklog/6569: [ 657.450264][ T1170] #0: ffff88809477f870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.460629][ T1170] 3 locks held by kworker/0:0/6896: [ 657.466886][ T1170] #0: ffff88809ab09138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.479648][ T1170] #1: ffffc90006037da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.491022][ T1170] #2: ffffffff8b150988 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.501313][ T1170] 1 lock held by syz-executor300/6926: [ 657.507584][ T1170] [ 657.509910][ T1170] ============================================= [ 657.509910][ T1170] [ 657.519778][ T1170] NMI backtrace for cpu 0 [ 657.524226][ T1170] CPU: 0 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.532562][ T1170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.542611][ T1170] Call Trace: [ 657.546026][ T1170] dump_stack+0x198/0x1fd [ 657.550363][ T1170] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.555617][ T1170] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.561250][ T1170] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.567269][ T1170] watchdog+0xd7d/0x1000 [ 657.571515][ T1170] ? reset_hung_task_detector+0x30/0x30 [ 657.577056][ T1170] kthread+0x3b5/0x4a0 [ 657.581121][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 657.586233][ T1170] ret_from_fork+0x1f/0x30 [ 657.590849][ T1170] Sending NMI from CPU 0 to CPUs 1: [ 657.596783][ C1] NMI backtrace for cpu 1 [ 657.596789][ C1] CPU: 1 PID: 3913 Comm: systemd-journal Not tainted 5.9.0-rc8-syzkaller #0 [ 657.596795][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.596799][ C1] RIP: 0010:unwind_next_frame+0xb35/0x1f90 [ 657.596809][ C1] Code: 0d 00 00 48 8b 40 60 48 89 44 24 60 e9 ac fb ff ff 49 8d 7f 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 b5 0c 00 00 4c 89 c0 49 8b 57 40 48 be 00 00 00 00 00 fc ff [ 657.596813][ C1] RSP: 0018:ffffc900054bf920 EFLAGS: 00000246 [ 657.596820][ C1] RAX: dffffc0000000000 RBX: 1ffff92000a97f2c RCX: ffffffff8bc434b7 [ 657.596825][ C1] RDX: 1ffff92000a97f51 RSI: 0000000000000001 RDI: ffffc900054bfa88 [ 657.596830][ C1] RBP: 0000000000000001 R08: ffffffff8bc434b2 R09: ffffffff8bc434b6 [ 657.596835][ C1] R10: 000000000007601f R11: 000000000000aad7 R12: ffffc900054bfa90 [ 657.596840][ C1] R13: ffffc900054bfa7d R14: ffffc900054bfa98 R15: ffffc900054bfa48 [ 657.596845][ C1] FS: 00007f0858cb58c0(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.596849][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.596854][ C1] CR2: 00007f0856056000 CR3: 0000000093abc000 CR4: 00000000001506e0 [ 657.596858][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.596863][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.596865][ C1] Call Trace: [ 657.596869][ C1] ? arch_stack_walk+0x5e/0xf0 [ 657.596872][ C1] ? deref_stack_reg+0x150/0x150 [ 657.596875][ C1] ? lock_downgrade+0x830/0x830 [ 657.596878][ C1] __unwind_start+0x517/0x800 [ 657.596881][ C1] ? profile_setup.cold+0xc1/0xc1 [ 657.596884][ C1] arch_stack_walk+0x5e/0xf0 [ 657.596888][ C1] ? arch_stack_walk+0x5e/0xf0 [ 657.596891][ C1] stack_trace_save+0x8c/0xc0 [ 657.596894][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 657.596898][ C1] kasan_save_stack+0x1b/0x40 [ 657.596901][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.596904][ C1] ? __zone_watermark_ok+0x440/0x440 [ 657.596907][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.596911][ C1] ? cache_grow_end+0x46/0x170 [ 657.596914][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596917][ C1] ? find_held_lock+0x2d/0x110 [ 657.596920][ C1] ? cache_alloc_refill+0x30a/0x380 [ 657.596923][ C1] ? lock_downgrade+0x830/0x830 [ 657.596927][ C1] ? do_raw_spin_unlock+0x171/0x230 [ 657.596930][ C1] ? kasan_unpoison_shadow+0x33/0x40 [ 657.596934][ C1] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 657.596937][ C1] kmem_cache_alloc+0x13a/0x3f0 [ 657.596940][ C1] ? seccomp_notify_ioctl+0xd90/0xd90 [ 657.596943][ C1] getname_flags.part.0+0x50/0x4f0 [ 657.596946][ C1] getname_flags+0x9a/0xe0 [ 657.596949][ C1] do_mkdirat+0x8d/0x2d0 [ 657.596953][ C1] ? user_path_create+0xf0/0xf0 [ 657.596956][ C1] ? __secure_computing+0x104/0x360 [ 657.596959][ C1] do_syscall_64+0x2d/0x70 [ 657.596962][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.596965][ C1] RIP: 0033:0x7f0857f71687 [ 657.596976][ C1] Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 [ 657.596979][ C1] RSP: 002b:00007ffd28545128 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 [ 657.596987][ C1] RAX: ffffffffffffffda RBX: 00007ffd28548040 RCX: 00007f0857f71687 [ 657.596992][ C1] RDX: 00007f08589e2a00 RSI: 00000000000001ed RDI: 000055b31d2148a0 [ 657.596997][ C1] RBP: 00007ffd28545160 R08: 0000000000000000 R09: 0000000000000000 [ 657.597001][ C1] R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 [ 657.597006][ C1] R13: 0000000000000000 R14: 00007ffd28548040 R15: 00007ffd28545650 [ 657.599573][ T1170] Kernel panic - not syncing: hung_task: blocked tasks [ 657.964229][ T1170] CPU: 0 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.972469][ T1170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.982510][ T1170] Call Trace: [ 657.985812][ T1170] dump_stack+0x198/0x1fd [ 657.990235][ T1170] panic+0x382/0x7fb [ 657.994129][ T1170] ? __warn_printk+0xf3/0xf3 [ 657.998735][ T1170] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.004366][ T1170] ? preempt_schedule_thunk+0x16/0x18 [ 658.009733][ T1170] ? watchdog.cold+0x5/0x16b [ 658.014321][ T1170] ? watchdog+0xa82/0x1000 [ 658.018747][ T1170] watchdog.cold+0x16/0x16b [ 658.023360][ T1170] ? reset_hung_task_detector+0x30/0x30 [ 658.028900][ T1170] kthread+0x3b5/0x4a0 [ 658.032963][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 658.038072][ T1170] ret_from_fork+0x1f/0x30 [ 658.044131][ T1170] Kernel Offset: disabled [ 658.048487][ T1170] Rebooting in 86400 seconds..