[ 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 '10.128.0.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 857.967184] INFO: task syz-executor182:8002 blocked for more than 140 seconds. [ 857.974638] Not tainted 4.14.273-syzkaller #0 [ 857.981135] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 857.989505] syz-executor182 D27904 8002 8000 0x00000004 [ 857.995125] Call Trace: [ 857.998260] __schedule+0x88b/0x1de0 [ 858.001961] ? lock_acquire+0x170/0x3f0 [ 858.005916] ? io_schedule_timeout+0x140/0x140 [ 858.011950] ? _raw_spin_unlock+0x29/0x40 [ 858.016091] ? fuse_writepage_locked+0xe80/0xe80 [ 858.021363] schedule+0x8d/0x1b0 [ 858.024718] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 858.030864] ? fuse_do_ioctl+0x1570/0x1570 [ 858.035120] ? end_page_writeback+0xe3/0x1c0 [ 858.040055] ? wait_woken+0x230/0x230 [ 858.043848] fuse_launder_page+0xa2/0xd0 [ 858.048460] invalidate_inode_pages2_range+0x547/0xc00 [ 858.053744] ? clear_shadow_entry+0x160/0x160 [ 858.058752] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 858.063669] ? fuse_file_alloc+0x1ca/0x260 [ 858.068440] ? _raw_spin_unlock+0x29/0x40 [ 858.072592] ? fuse_do_open+0x18e/0x460 [ 858.076544] fuse_finish_open+0x262/0x500 [ 858.081702] fuse_open_common+0x234/0x290 [ 858.085838] do_dentry_open+0x44b/0xec0 [ 858.090312] ? fuse_open_common+0x290/0x290 [ 858.094620] ? __inode_permission+0xcd/0x2f0 [ 858.099534] vfs_open+0x105/0x220 [ 858.102974] path_openat+0x628/0x2970 [ 858.106754] ? path_lookupat+0x780/0x780 [ 858.111508] ? trace_hardirqs_on+0x10/0x10 [ 858.115734] do_filp_open+0x179/0x3c0 [ 858.120037] ? may_open_dev+0xe0/0xe0 [ 858.123826] ? lock_downgrade+0x740/0x740 [ 858.128473] ? do_raw_spin_unlock+0x164/0x220 [ 858.132955] ? _raw_spin_unlock+0x29/0x40 [ 858.137605] ? __alloc_fd+0x1be/0x490 [ 858.141393] do_sys_open+0x296/0x410 [ 858.145081] ? filp_open+0x60/0x60 [ 858.149436] ? do_syscall_64+0x4c/0x640 [ 858.153394] ? compat_SyS_openat+0x30/0x30 [ 858.158174] do_syscall_64+0x1d5/0x640 [ 858.162052] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.167738] RIP: 0033:0x7ff5206644c9 [ 858.171432] RSP: 002b:00007ff5206152f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 858.180321] RAX: ffffffffffffffda RBX: 00007ff5206f54c0 RCX: 00007ff5206644c9 [ 858.187939] RDX: 00007ff5206644c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 858.195194] RBP: 00007ff5206c2164 R08: 0000000000000000 R09: 0000000000000000 [ 858.202975] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 858.210891] R13: 00007ff5206be158 R14: 00007ff5206c0160 R15: 00007ff5206f54c8 [ 858.218512] [ 858.218512] Showing all locks held in the system: [ 858.224826] 1 lock held by khungtaskd/1533: [ 858.229305] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.238411] 1 lock held by in:imklog/7703: [ 858.242627] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 858.251148] 2 locks held by syz-executor182/8002: [ 858.255988] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 858.264444] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 858.274538] [ 858.276161] ============================================= [ 858.276161] [ 858.283624] NMI backtrace for cpu 0 [ 858.287312] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.273-syzkaller #0 [ 858.294741] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.304072] Call Trace: [ 858.306636] dump_stack+0x1b2/0x281 [ 858.310238] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.314709] ? irq_force_complete_move+0x350/0x350 [ 858.319616] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.324867] watchdog+0x5b9/0xb40 [ 858.328298] ? hungtask_pm_notify+0x50/0x50 [ 858.332594] kthread+0x30d/0x420 [ 858.335937] ? kthread_create_on_node+0xd0/0xd0 [ 858.340583] ret_from_fork+0x24/0x30 [ 858.344361] Sending NMI from CPU 0 to CPUs 1: [ 858.349173] NMI backtrace for cpu 1 [ 858.349177] CPU: 1 PID: 8 Comm: rcu_preempt Not tainted 4.14.273-syzkaller #0 [ 858.349182] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.349185] task: ffff8880b5420200 task.stack: ffff8880b5428000 [ 858.349188] RIP: 0010:detach_if_pending+0x10d/0x430 [ 858.349191] RSP: 0018:ffff8880b542fbd8 EFLAGS: 00000046 [ 858.349196] RAX: dffffc0000000000 RBX: ffff8880b542fd18 RCX: 0000000000000000 [ 858.349200] RDX: 1ffff110174a599a RSI: 00000000ffffffff RDI: 0000000000000086 [ 858.349203] RBP: ffffffff8948e1a0 R08: ffffffff8b9c7430 R09: 0000000000000001 [ 858.349207] R10: 0000000000000000 R11: ffff8880b5420200 R12: ffff8880ba52ccd0 [ 858.349210] R13: 0000000000000001 R14: ffff8880b542fd20 R15: 0000000000000001 [ 858.349214] FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 858.349217] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 858.349220] CR2: 00007fa4ce19b010 CR3: 00000000a14d7000 CR4: 00000000003406e0 [ 858.349224] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 858.349228] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 858.349229] Call Trace: [ 858.349232] try_to_del_timer_sync+0x9a/0xe0 [ 858.349234] ? detach_if_pending+0x430/0x430 [ 858.349236] del_timer_sync+0x17c/0x240 [ 858.349239] schedule_timeout+0x4b7/0xe90 [ 858.349242] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 858.349244] ? usleep_range+0x130/0x130 [ 858.349247] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 858.349249] ? prepare_to_swait+0x115/0x2a0 [ 858.349252] ? run_timer_softirq+0x5a0/0x5a0 [ 858.349254] rcu_gp_kthread+0xc0a/0x1e60 [ 858.349256] ? force_qs_rnp+0x4f0/0x4f0 [ 858.349259] ? force_qs_rnp+0x4f0/0x4f0 [ 858.349261] kthread+0x30d/0x420 [ 858.349263] ? kthread_create_on_node+0xd0/0xd0 [ 858.349265] ret_from_fork+0x24/0x30 [ 858.349267] Code: f2 48 8b 2b 48 c1 ea 03 80 3c 02 00 0f 85 fe 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 08 4c 89 e2 48 c1 ea 03 80 3c 02 00 <0f> 85 ec 02 00 00 48 85 ed 49 89 2c 24 74 28 e8 ff ed 0c 00 48 [ 858.350405] Kernel panic - not syncing: hung_task: blocked tasks [ 858.548658] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.273-syzkaller #0 [ 858.556076] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.565402] Call Trace: [ 858.567969] dump_stack+0x1b2/0x281 [ 858.571569] panic+0x1f9/0x42d [ 858.574737] ? add_taint.cold+0x16/0x16 [ 858.578690] watchdog+0x5ca/0xb40 [ 858.582119] ? hungtask_pm_notify+0x50/0x50 [ 858.586414] kthread+0x30d/0x420 [ 858.589752] ? kthread_create_on_node+0xd0/0xd0 [ 858.594396] ret_from_fork+0x24/0x30 [ 858.598357] Kernel Offset: disabled [ 858.601969] Rebooting in 86400 seconds..