[ 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 '10.128.1.36' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 503.570662][ T6881] IPVS: ftp: loaded support on port[0] = 21 [ 657.173285][ T1169] INFO: task kworker/0:0:6873 blocked for more than 143 seconds. [ 657.181192][ T1169] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.191272][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.200898][ T1169] task:kworker/0:0 state:D stack:29288 pid: 6873 ppid: 2 flags:0x00004000 [ 657.211474][ T1169] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.218768][ T1169] Call Trace: [ 657.222135][ T1169] __schedule+0xec9/0x2280 [ 657.227812][ T1169] ? io_schedule_timeout+0x140/0x140 [ 657.234065][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.240141][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.246642][ T1169] ? lockdep_hardirqs_on+0x53/0x100 [ 657.251854][ T1169] schedule+0xd0/0x2a0 [ 657.257184][ T1169] schedule_preempt_disabled+0xf/0x20 [ 657.262564][ T1169] __mutex_lock+0x3e2/0x10e0 [ 657.268297][ T1169] ? addrconf_verify_work+0xa/0x20 [ 657.274282][ T1169] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.279672][ T1169] ? lock_release+0x8f0/0x8f0 [ 657.286595][ T1169] ? lock_downgrade+0x830/0x830 [ 657.291465][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.298847][ T1169] ? lock_is_held_type+0xbb/0xf0 [ 657.304748][ T1169] addrconf_verify_work+0xa/0x20 [ 657.309807][ T1169] process_one_work+0x94c/0x1670 [ 657.315920][ T1169] ? lock_release+0x8f0/0x8f0 [ 657.320608][ T1169] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.327106][ T1169] ? rwlock_bug.part.0+0x90/0x90 [ 657.332051][ T1169] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.338469][ T1169] worker_thread+0x64c/0x1120 [ 657.343890][ T1169] ? __kthread_parkme+0x13f/0x1e0 [ 657.348922][ T1169] ? process_one_work+0x1670/0x1670 [ 657.355337][ T1169] kthread+0x3b5/0x4a0 [ 657.359409][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 657.365768][ T1169] ret_from_fork+0x1f/0x30 [ 657.370269][ T1169] [ 657.370269][ T1169] Showing all locks held in the system: [ 657.379280][ T1169] 1 lock held by khungtaskd/1169: [ 657.385151][ T1169] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.395785][ T1169] 1 lock held by in:imklog/6571: [ 657.400713][ T1169] #0: ffff88809f0d8b30 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.411120][ T1169] 3 locks held by kworker/0:0/6873: [ 657.418671][ T1169] #0: ffff88809a0ef138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.431229][ T1169] #1: ffffc900060b7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.442652][ T1169] #2: ffffffff8b150948 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.452881][ T1169] 2 locks held by syz-executor544/6903: [ 657.459192][ T1169] [ 657.461517][ T1169] ============================================= [ 657.461517][ T1169] [ 657.471041][ T1169] NMI backtrace for cpu 1 [ 657.475493][ T1169] CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.483717][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.493758][ T1169] Call Trace: [ 657.497166][ T1169] dump_stack+0x198/0x1fd [ 657.501525][ T1169] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.506757][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.512390][ T1169] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.518426][ T1169] watchdog+0xd7d/0x1000 [ 657.522671][ T1169] ? reset_hung_task_detector+0x30/0x30 [ 657.528214][ T1169] kthread+0x3b5/0x4a0 [ 657.532285][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 657.537394][ T1169] ret_from_fork+0x1f/0x30 [ 657.542027][ T1169] Sending NMI from CPU 1 to CPUs 0: [ 657.547690][ C0] NMI backtrace for cpu 0 [ 657.547696][ C0] CPU: 0 PID: 3914 Comm: systemd-journal Not tainted 5.9.0-rc8-syzkaller #0 [ 657.547702][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.547705][ C0] RIP: 0010:write_comp_data+0x2f/0x80 [ 657.547716][ C0] Code: 05 46 c4 8b 7e 65 48 8b 34 25 c0 fe 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 2c 14 00 00 85 c0 74 4f 8b 86 08 14 00 00 <83> f8 03 75 44 48 8b 86 10 14 00 00 8b b6 0c 14 00 00 4c 8b 00 48 [ 657.547719][ C0] RSP: 0018:ffffc90001027de8 EFLAGS: 00000046 [ 657.547726][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817c0e61 [ 657.547731][ C0] RDX: 0000000000000000 RSI: ffff8880933040c0 RDI: 0000000000000005 [ 657.547736][ C0] RBP: ffff8880aa06f900 R08: 0000000000000001 R09: ffffffff8a012f5b [ 657.547740][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 [ 657.547745][ C0] R13: ffff88809f623610 R14: 0000000000000200 R15: 0000000000000000 [ 657.547750][ C0] FS: 00007fdd639bc8c0(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 657.547754][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.547764][ C0] CR2: 00007fdd60d5b000 CR3: 0000000092cb0000 CR4: 00000000001506f0 [ 657.547769][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.547773][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.547776][ C0] Call Trace: [ 657.547779][ C0] trace_hardirqs_off+0x51/0x210 [ 657.547782][ C0] kmem_cache_free.part.0+0x15b/0x1e0 [ 657.547785][ C0] __put_cred+0x1de/0x250 [ 657.547788][ C0] revert_creds+0x1a8/0x1f0 [ 657.547791][ C0] do_faccessat+0x2ca/0x820 [ 657.547794][ C0] ? stream_open+0x60/0x60 [ 657.547798][ C0] ? __secure_computing+0x104/0x360 [ 657.547801][ C0] do_syscall_64+0x2d/0x70 [ 657.547804][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.547807][ C0] RIP: 0033:0x7fdd62c789c7 [ 657.547817][ C0] Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 [ 657.547821][ C0] RSP: 002b:00007ffd41dadbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 657.547829][ C0] RAX: ffffffffffffffda RBX: 00007ffd41db0b10 RCX: 00007fdd62c789c7 [ 657.547834][ C0] RDX: 00007fdd636e9a00 RSI: 0000000000000000 RDI: 000055ead42c99a3 [ 657.547838][ C0] RBP: 00007ffd41dadc30 R08: 0000000000000000 R09: 0000000000000000 [ 657.547843][ C0] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 657.547847][ C0] R13: 0000000000000000 R14: 00007ffd41db0b10 R15: 00007ffd41dae120 [ 657.550483][ T1169] Kernel panic - not syncing: hung_task: blocked tasks [ 657.807051][ T1169] CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.815278][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.825325][ T1169] Call Trace: [ 657.828618][ T1169] dump_stack+0x198/0x1fd [ 657.833022][ T1169] panic+0x382/0x7fb [ 657.836921][ T1169] ? __warn_printk+0xf3/0xf3 [ 657.841512][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.847142][ T1169] ? preempt_schedule_thunk+0x16/0x18 [ 657.852519][ T1169] ? watchdog.cold+0x5/0x16b [ 657.857108][ T1169] ? watchdog+0xa82/0x1000 [ 657.861523][ T1169] watchdog.cold+0x16/0x16b [ 657.866027][ T1169] ? reset_hung_task_detector+0x30/0x30 [ 657.871567][ T1169] kthread+0x3b5/0x4a0 [ 657.875627][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 657.880733][ T1169] ret_from_fork+0x1f/0x30 [ 657.886711][ T1169] Kernel Offset: disabled [ 657.891090][ T1169] Rebooting in 86400 seconds..