[ OK ] Reached target Login Prompts. [ 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 '10.128.0.234' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 496.703357][ T6878] IPVS: ftp: loaded support on port[0] = 21 [ 657.244831][ T1177] INFO: task kworker/0:1:6870 blocked for more than 143 seconds. [ 657.252766][ T1177] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.264311][ T1177] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.273933][ T1177] task:kworker/0:1 state:D stack:29928 pid: 6870 ppid: 2 flags:0x00004000 [ 657.284384][ T1177] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.291604][ T1177] Call Trace: [ 657.295829][ T1177] __schedule+0xec9/0x2280 [ 657.300269][ T1177] ? io_schedule_timeout+0x140/0x140 [ 657.307136][ T1177] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.313161][ T1177] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.319702][ T1177] ? lockdep_hardirqs_on+0x53/0x100 [ 657.325882][ T1177] schedule+0xd0/0x2a0 [ 657.329971][ T1177] schedule_preempt_disabled+0xf/0x20 [ 657.336656][ T1177] __mutex_lock+0x3e2/0x10e0 [ 657.341264][ T1177] ? addrconf_verify_work+0xa/0x20 [ 657.347750][ T1177] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.353154][ T1177] ? lock_release+0x8f0/0x8f0 [ 657.360456][ T1177] ? lock_downgrade+0x830/0x830 [ 657.366220][ T1177] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.371441][ T1177] ? lock_is_held_type+0xbb/0xf0 [ 657.377781][ T1177] addrconf_verify_work+0xa/0x20 [ 657.382856][ T1177] process_one_work+0x94c/0x1670 [ 657.390498][ T1177] ? lock_release+0x8f0/0x8f0 [ 657.395992][ T1177] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.401386][ T1177] ? rwlock_bug.part.0+0x90/0x90 [ 657.407692][ T1177] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.412917][ T1177] worker_thread+0x64c/0x1120 [ 657.418946][ T1177] ? __kthread_parkme+0x13f/0x1e0 [ 657.424010][ T1177] ? process_one_work+0x1670/0x1670 [ 657.430598][ T1177] kthread+0x3b5/0x4a0 [ 657.435517][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 657.440698][ T1177] ret_from_fork+0x1f/0x30 [ 657.446653][ T1177] [ 657.446653][ T1177] Showing all locks held in the system: [ 657.454387][ T1177] 1 lock held by khungtaskd/1177: [ 657.460899][ T1177] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.471752][ T1177] 1 lock held by in:imklog/6563: [ 657.477574][ T1177] #0: ffff88809701e430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.487788][ T1177] 3 locks held by kworker/0:1/6870: [ 657.492991][ T1177] #0: ffff888214e87538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.506280][ T1177] #1: ffffc900055c7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.518781][ T1177] #2: ffffffff8b150988 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.529114][ T1177] 1 lock held by syz-executor446/6900: [ 657.535050][ T1177] [ 657.537406][ T1177] ============================================= [ 657.537406][ T1177] [ 657.546360][ T1177] NMI backtrace for cpu 1 [ 657.550703][ T1177] CPU: 1 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.558938][ T1177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.568990][ T1177] Call Trace: [ 657.572432][ T1177] dump_stack+0x198/0x1fd [ 657.576774][ T1177] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.582029][ T1177] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.587667][ T1177] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.593701][ T1177] watchdog+0xd7d/0x1000 [ 657.597953][ T1177] ? reset_hung_task_detector+0x30/0x30 [ 657.603507][ T1177] kthread+0x3b5/0x4a0 [ 657.607577][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 657.612724][ T1177] ret_from_fork+0x1f/0x30 [ 657.617267][ T1177] Sending NMI from CPU 1 to CPUs 0: [ 657.623087][ C0] NMI backtrace for cpu 0 [ 657.623094][ C0] CPU: 0 PID: 3919 Comm: systemd-journal Not tainted 5.9.0-rc8-syzkaller #0 [ 657.623101][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.623105][ C0] RIP: 0010:path_parentat+0x0/0x1b0 [ 657.623117][ C0] Code: 9e fd ff ff 48 8b 7c 24 40 e8 7c 41 f1 ff e9 5f fd ff ff e8 62 41 f1 ff e9 b3 fd ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 55 49 89 fd 41 54 41 89 f4 53 48 89 d3 e8 b9 68 b0 [ 657.623121][ C0] RSP: 0018:ffffc90005347c10 EFLAGS: 00000202 [ 657.623130][ C0] RAX: dffffc0000000000 RBX: ffff888092fc41c0 RCX: ffffffff81c62e9a [ 657.623135][ C0] RDX: ffffc90005347ed0 RSI: 0000000000000040 RDI: ffffc90005347c58 [ 657.623141][ C0] RBP: ffffc90005347dc0 R08: ffffc90005347e20 R09: ffffc90005347e10 [ 657.623146][ C0] R10: fffffffffffff000 R11: 0000000000000000 R12: ffff88808947abc0 [ 657.623152][ C0] R13: ffffc90005347e10 R14: ffffc90005347ed0 R15: ffffc90005347c58 [ 657.623158][ C0] FS: 00007f0f631968c0(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 657.623162][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.623168][ C0] CR2: 00007f0f60535000 CR3: 00000000934f1000 CR4: 00000000001506f0 [ 657.623173][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.623179][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.623182][ C0] Call Trace: [ 657.623186][ C0] filename_parentat+0x188/0x560 [ 657.623189][ C0] ? getname+0xd0/0xd0 [ 657.623193][ C0] ? find_held_lock+0x2d/0x110 [ 657.623197][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.623201][ C0] ? find_held_lock+0x2d/0x110 [ 657.623205][ C0] ? __might_fault+0x11f/0x1d0 [ 657.623209][ C0] ? do_raw_spin_unlock+0x171/0x230 [ 657.623213][ C0] ? __virt_addr_valid+0x1fe/0x2b0 [ 657.623216][ C0] ? __phys_addr+0x9a/0x110 [ 657.623220][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 657.623224][ C0] filename_create+0x9e/0x490 [ 657.623228][ C0] ? strncpy_from_user+0x2bf/0x3e0 [ 657.623232][ C0] ? filename_parentat+0x560/0x560 [ 657.623236][ C0] ? getname_flags.part.0+0x1dd/0x4f0 [ 657.623239][ C0] do_mkdirat+0xa0/0x2d0 [ 657.623243][ C0] ? user_path_create+0xf0/0xf0 [ 657.623247][ C0] ? __secure_computing+0x104/0x360 [ 657.623251][ C0] do_syscall_64+0x2d/0x70 [ 657.623255][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.623259][ C0] RIP: 0033:0x7f0f62452687 [ 657.623270][ C0] 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 [ 657.623274][ C0] RSP: 002b:00007ffd5e1cf4e8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 [ 657.623284][ C0] RAX: ffffffffffffffda RBX: 00007ffd5e1d2550 RCX: 00007f0f62452687 [ 657.623289][ C0] RDX: 0000000000000000 RSI: 00000000000001ed RDI: 0000555a5b8368a0 [ 657.623295][ C0] RBP: 00007ffd5e1cf520 R08: 0000555a5a4753e5 R09: 0000000000000018 [ 657.623300][ C0] R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 [ 657.623306][ C0] R13: 0000000000000001 R14: 0000555a5b8368a0 R15: 00007ffd5e1cfb60 [ 657.624230][ T1177] Kernel panic - not syncing: hung_task: blocked tasks [ 657.931919][ T1177] CPU: 1 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.940148][ T1177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.950209][ T1177] Call Trace: [ 657.953508][ T1177] dump_stack+0x198/0x1fd [ 657.957928][ T1177] panic+0x382/0x7fb [ 657.961829][ T1177] ? __warn_printk+0xf3/0xf3 [ 657.966439][ T1177] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.972087][ T1177] ? preempt_schedule_thunk+0x16/0x18 [ 657.977456][ T1177] ? watchdog.cold+0x5/0x16b [ 657.982145][ T1177] ? watchdog+0xa82/0x1000 [ 657.986563][ T1177] watchdog.cold+0x16/0x16b [ 657.991069][ T1177] ? reset_hung_task_detector+0x30/0x30 [ 657.996613][ T1177] kthread+0x3b5/0x4a0 [ 658.000681][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 658.005827][ T1177] ret_from_fork+0x1f/0x30 [ 658.011794][ T1177] Kernel Offset: disabled [ 658.016119][ T1177] Rebooting in 86400 seconds..