[ 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 '10.128.1.119' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 1001.317372] INFO: task syz-executor394:7979 blocked for more than 140 seconds. [ 1001.324790] Not tainted 4.14.275-syzkaller #0 [ 1001.331195] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.339539] syz-executor394 D28376 7979 7977 0x00000004 [ 1001.345190] Call Trace: [ 1001.348366] __schedule+0x88b/0x1de0 [ 1001.352072] ? lock_acquire+0x170/0x3f0 [ 1001.356028] ? io_schedule_timeout+0x140/0x140 [ 1001.361660] ? _raw_spin_unlock+0x29/0x40 [ 1001.365796] ? fuse_writepage_locked+0xe80/0xe80 [ 1001.371119] schedule+0x8d/0x1b0 [ 1001.374526] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 1001.380693] ? fuse_do_ioctl+0x1570/0x1570 [ 1001.385074] ? end_page_writeback+0xe3/0x1c0 [ 1001.390041] ? wait_woken+0x230/0x230 [ 1001.393835] fuse_launder_page+0xa2/0xd0 [ 1001.398548] invalidate_inode_pages2_range+0x547/0xc00 [ 1001.403825] ? clear_shadow_entry+0x160/0x160 [ 1001.409531] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 1001.414447] ? fuse_file_alloc+0x1ca/0x260 [ 1001.419160] ? _raw_spin_unlock+0x29/0x40 [ 1001.423295] ? fuse_do_open+0x18e/0x460 [ 1001.427772] fuse_finish_open+0x262/0x500 [ 1001.431908] fuse_open_common+0x234/0x290 [ 1001.436035] do_dentry_open+0x44b/0xec0 [ 1001.440700] ? fuse_open_common+0x290/0x290 [ 1001.445007] ? __inode_permission+0xcd/0x2f0 [ 1001.449935] vfs_open+0x105/0x220 [ 1001.453405] path_openat+0x628/0x2970 [ 1001.457190] ? path_lookupat+0x780/0x780 [ 1001.461944] ? trace_hardirqs_on+0x10/0x10 [ 1001.466172] do_filp_open+0x179/0x3c0 [ 1001.470506] ? may_open_dev+0xe0/0xe0 [ 1001.474298] ? lock_downgrade+0x740/0x740 [ 1001.478960] ? do_raw_spin_unlock+0x164/0x220 [ 1001.483603] ? _raw_spin_unlock+0x29/0x40 [ 1001.488605] ? __alloc_fd+0x1be/0x490 [ 1001.492395] do_sys_open+0x296/0x410 [ 1001.496087] ? filp_open+0x60/0x60 [ 1001.500318] ? do_syscall_64+0x4c/0x640 [ 1001.504280] ? do_sys_open+0x410/0x410 [ 1001.508666] do_syscall_64+0x1d5/0x640 [ 1001.512541] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.518242] RIP: 0033:0x7f76badac4c9 [ 1001.521943] RSP: 002b:00007f76bad5d2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1001.530157] RAX: ffffffffffffffda RBX: 00007f76bae3d4c0 RCX: 00007f76badac4c9 [ 1001.537793] RDX: 0000000000000000 RSI: 0000000000000700 RDI: 0000000020000100 [ 1001.545064] RBP: 00007f76bae0a164 R08: 0000000000000000 R09: 0000000000000000 [ 1001.552899] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 1001.560498] R13: 00007f76bae06158 R14: 00007f76bae08160 R15: 00007f76bae3d4c8 [ 1001.568120] [ 1001.568120] Showing all locks held in the system: [ 1001.574437] 1 lock held by khungtaskd/1533: [ 1001.578851] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.588016] 1 lock held by in:imklog/7694: [ 1001.592234] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 1001.600739] 2 locks held by syz-executor394/7979: [ 1001.605567] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 1001.614042] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 1001.624164] [ 1001.625792] ============================================= [ 1001.625792] [ 1001.633780] NMI backtrace for cpu 0 [ 1001.637473] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.275-syzkaller #0 [ 1001.644907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.654239] Call Trace: [ 1001.656810] dump_stack+0x1b2/0x281 [ 1001.660419] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.664910] ? irq_force_complete_move+0x350/0x350 [ 1001.669818] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1001.675090] watchdog+0x5b9/0xb40 [ 1001.678523] ? hungtask_pm_notify+0x50/0x50 [ 1001.682836] kthread+0x30d/0x420 [ 1001.686182] ? kthread_create_on_node+0xd0/0xd0 [ 1001.690829] ret_from_fork+0x24/0x30 [ 1001.694603] Sending NMI from CPU 0 to CPUs 1: [ 1001.699495] NMI backtrace for cpu 1 [ 1001.699499] CPU: 1 PID: 8 Comm: rcu_preempt Not tainted 4.14.275-syzkaller #0 [ 1001.699503] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.699506] task: ffff8880b5420200 task.stack: ffff8880b5428000 [ 1001.699509] RIP: 0010:__lock_acquire+0xaab/0x3f20 [ 1001.699511] RSP: 0018:ffff8880b542fa48 EFLAGS: 00000802 [ 1001.699517] RAX: 1ffffffff167dea7 RBX: ffffffff8b3ef520 RCX: 00000000000016aa [ 1001.699520] RDX: 1ffffffff1736002 RSI: 00000000bcc77e12 RDI: ffffffff8b3ef538 [ 1001.699523] RBP: dffffc0000000000 R08: ffffffff8b9b0010 R09: 00000000000c00cd [ 1001.699527] R10: ffff8880b5420a88 R11: ffff8880b5420200 R12: ffff8880b5420aa0 [ 1001.699530] R13: 0000000000000001 R14: 8c8f84168311dce9 R15: ffffffff8bed0d40 [ 1001.699534] FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 1001.699537] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.699540] CR2: 00007fb523dc1018 CR3: 00000000a1126000 CR4: 00000000003406e0 [ 1001.699543] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.699547] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.699548] Call Trace: [ 1001.699551] ? __switch_to_xtra+0x378/0x12f0 [ 1001.699553] ? finish_task_switch+0x178/0x610 [ 1001.699555] ? trace_hardirqs_on+0x10/0x10 [ 1001.699558] ? _raw_spin_unlock_irq+0x24/0x80 [ 1001.699560] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 1001.699563] ? _raw_spin_unlock_irq+0x5a/0x80 [ 1001.699565] ? finish_task_switch+0x178/0x610 [ 1001.699567] ? finish_task_switch+0x14d/0x610 [ 1001.699570] ? switch_mm_irqs_off+0x2d2/0xeb0 [ 1001.699572] ? __schedule+0x893/0x1de0 [ 1001.699574] lock_acquire+0x170/0x3f0 [ 1001.699576] ? del_timer_sync+0x79/0x240 [ 1001.699578] del_timer_sync+0xaf/0x240 [ 1001.699580] ? del_timer_sync+0x79/0x240 [ 1001.699583] schedule_timeout+0x4b7/0xe90 [ 1001.699585] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1001.699587] ? usleep_range+0x130/0x130 [ 1001.699590] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1001.699592] ? prepare_to_swait+0x115/0x2a0 [ 1001.699595] ? run_timer_softirq+0x5a0/0x5a0 [ 1001.699597] rcu_gp_kthread+0xc0a/0x1e60 [ 1001.699599] ? force_qs_rnp+0x4f0/0x4f0 [ 1001.699602] ? force_qs_rnp+0x4f0/0x4f0 [ 1001.699603] kthread+0x30d/0x420 [ 1001.699606] ? kthread_create_on_node+0xd0/0xd0 [ 1001.699608] ret_from_fork+0x24/0x30 [ 1001.699609] Code: 00 fc ff df eb 06 48 83 eb 08 74 3d 48 8d 7b 18 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 24 1f 00 00 4c 3b 73 18 0f 84 81 fd ff ff <48> 8d 7b 08 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 9c 1e 00 00 [ 1001.700158] Kernel panic - not syncing: hung_task: blocked tasks [ 1001.946280] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.275-syzkaller #0 [ 1001.953698] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.963029] Call Trace: [ 1001.965599] dump_stack+0x1b2/0x281 [ 1001.969207] panic+0x1f9/0x42d [ 1001.972377] ? add_taint.cold+0x16/0x16 [ 1001.976331] ? printk_safe_flush+0xa9/0x110 [ 1001.980632] watchdog+0x5ca/0xb40 [ 1001.984063] ? hungtask_pm_notify+0x50/0x50 [ 1001.988361] kthread+0x30d/0x420 [ 1001.991724] ? kthread_create_on_node+0xd0/0xd0 [ 1001.996374] ret_from_fork+0x24/0x30 [ 1002.000238] Kernel Offset: disabled [ 1002.003851] Rebooting in 86400 seconds..