[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.192' (ECDSA) to the list of known hosts. syzkaller login: [ 1001.321863] INFO: task syz-executor150:7983 blocked for more than 140 seconds. [ 1001.329300] Not tainted 4.14.266-syzkaller #0 [ 1001.335426] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.343801] syz-executor150 D28528 7983 7981 0x00000004 [ 1001.349427] Call Trace: [ 1001.352570] __schedule+0x88b/0x1de0 [ 1001.356274] ? lock_acquire+0x170/0x3f0 [ 1001.360253] ? io_schedule_timeout+0x140/0x140 [ 1001.365687] ? _raw_spin_unlock+0x29/0x40 [ 1001.369829] ? fuse_writepage_locked+0xe80/0xe80 [ 1001.375205] schedule+0x8d/0x1b0 [ 1001.378565] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 1001.384764] ? fuse_do_ioctl+0x1570/0x1570 [ 1001.388989] ? end_page_writeback+0xe3/0x1c0 [ 1001.393989] ? wait_woken+0x230/0x230 [ 1001.397779] fuse_launder_page+0xa2/0xd0 [ 1001.402472] invalidate_inode_pages2_range+0x547/0xc00 [ 1001.407761] ? clear_shadow_entry+0x160/0x160 [ 1001.412799] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 1001.417718] ? fuse_file_alloc+0x1ca/0x260 [ 1001.422482] ? _raw_spin_unlock+0x29/0x40 [ 1001.426625] ? fuse_do_open+0x18e/0x460 [ 1001.430580] fuse_finish_open+0x262/0x500 [ 1001.435498] fuse_open_common+0x234/0x290 [ 1001.439637] do_dentry_open+0x44b/0xec0 [ 1001.444149] ? fuse_open_common+0x290/0x290 [ 1001.448465] ? __inode_permission+0xcd/0x2f0 [ 1001.453422] vfs_open+0x105/0x220 [ 1001.456869] path_openat+0x628/0x2970 [ 1001.460654] ? path_lookupat+0x780/0x780 [ 1001.465545] ? trace_hardirqs_on+0x10/0x10 [ 1001.469776] do_filp_open+0x179/0x3c0 [ 1001.474229] ? may_open_dev+0xe0/0xe0 [ 1001.478030] ? lock_downgrade+0x740/0x740 [ 1001.483473] ? do_raw_spin_unlock+0x164/0x220 [ 1001.487962] ? _raw_spin_unlock+0x29/0x40 [ 1001.492657] ? __alloc_fd+0x1be/0x490 [ 1001.496454] do_sys_open+0x296/0x410 [ 1001.500146] ? filp_open+0x60/0x60 [ 1001.504397] ? do_syscall_64+0x4c/0x640 [ 1001.508363] ? compat_SyS_openat+0x30/0x30 [ 1001.513134] do_syscall_64+0x1d5/0x640 [ 1001.517171] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.522952] RIP: 0033:0x7f0cfeff54b9 [ 1001.526653] RSP: 002b:00007f0cfefa62f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 1001.534935] RAX: ffffffffffffffda RBX: 00007f0cff0864c0 RCX: 00007f0cfeff54b9 [ 1001.542547] RDX: 00007f0cfeff54b9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 1001.549807] RBP: 00007f0cff053154 R08: 0000000000000000 R09: 0000000000000000 [ 1001.557656] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 1001.565294] R13: 00007f0cff04f148 R14: 00007f0cff051150 R15: 00007f0cff0864c8 [ 1001.572941] [ 1001.572941] Showing all locks held in the system: [ 1001.579264] 1 lock held by khungtaskd/1530: [ 1001.583745] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.592860] 1 lock held by in:imklog/7711: [ 1001.597202] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 1001.605709] 2 locks held by syz-executor150/7983: [ 1001.610540] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 1001.619056] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 1001.629194] [ 1001.630812] ============================================= [ 1001.630812] [ 1001.638419] NMI backtrace for cpu 0 [ 1001.642125] CPU: 0 PID: 1530 Comm: khungtaskd Not tainted 4.14.266-syzkaller #0 [ 1001.649566] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.658906] Call Trace: [ 1001.661479] dump_stack+0x1b2/0x281 [ 1001.665087] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.669561] ? irq_force_complete_move+0x350/0x350 [ 1001.674470] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1001.679727] watchdog+0x5b9/0xb40 [ 1001.683166] ? hungtask_pm_notify+0x50/0x50 [ 1001.687489] kthread+0x30d/0x420 [ 1001.690848] ? kthread_create_on_node+0xd0/0xd0 [ 1001.695503] ret_from_fork+0x24/0x30 [ 1001.699266] Sending NMI from CPU 0 to CPUs 1: [ 1001.704208] NMI backtrace for cpu 1 [ 1001.704212] CPU: 1 PID: 8 Comm: rcu_preempt Not tainted 4.14.266-syzkaller #0 [ 1001.704216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.704219] task: ffff8880b5420200 task.stack: ffff8880b5428000 [ 1001.704222] RIP: 0010:__lock_acquire+0x225/0x3f20 [ 1001.704225] RSP: 0018:ffff8880b542f948 EFLAGS: 00000006 [ 1001.704230] RAX: ffffffff8b9ed370 RBX: 0000000000000000 RCX: 0000000000000000 [ 1001.704233] RDX: 1ffff110174a6874 RSI: 0000000000000000 RDI: ffff8880ba5343a0 [ 1001.704237] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 [ 1001.704240] R10: 0000000000000001 R11: ffff8880b5420200 R12: ffff8880ba534398 [ 1001.704244] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8becdd40 [ 1001.704247] FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 1001.704250] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.704253] CR2: 00007f5330fd7008 CR3: 00000000a1f64000 CR4: 00000000003406e0 [ 1001.704257] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.704260] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.704262] Call Trace: [ 1001.704264] ? __lock_acquire+0x5fc/0x3f20 [ 1001.704266] ? trace_hardirqs_on+0x10/0x10 [ 1001.704269] ? check_preemption_disabled+0x35/0x240 [ 1001.704271] ? __switch_to_xtra+0x93/0x12f0 [ 1001.704274] lock_acquire+0x170/0x3f0 [ 1001.704276] ? finish_task_switch+0x14d/0x610 [ 1001.704279] finish_task_switch+0x170/0x610 [ 1001.704281] ? finish_task_switch+0x14d/0x610 [ 1001.704283] __schedule+0x893/0x1de0 [ 1001.704286] ? schedule_timeout+0x4a5/0xe90 [ 1001.704288] ? io_schedule_timeout+0x140/0x140 [ 1001.704291] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1001.704293] schedule+0x8d/0x1b0 [ 1001.704296] schedule_timeout+0x4af/0xe90 [ 1001.704299] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1001.704301] ? usleep_range+0x130/0x130 [ 1001.704304] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1001.704306] ? prepare_to_swait+0x115/0x2a0 [ 1001.704308] ? run_timer_softirq+0x5a0/0x5a0 [ 1001.704311] rcu_gp_kthread+0xc0a/0x1e60 [ 1001.704313] ? force_qs_rnp+0x4f0/0x4f0 [ 1001.704316] ? force_qs_rnp+0x4f0/0x4f0 [ 1001.704318] kthread+0x30d/0x420 [ 1001.704320] ? kthread_create_on_node+0xd0/0xd0 [ 1001.704323] ret_from_fork+0x24/0x30 [ 1001.704324] Code: 4b 8d 7c f4 08 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 2a 00 00 4b 8b 44 f4 08 48 85 c0 0f 84 31 ff ff ff f0 ff 80 38 01 00 00 <49> 8d b3 80 08 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f1 48 [ 1001.704861] Kernel panic - not syncing: hung_task: blocked tasks [ 1001.947496] CPU: 0 PID: 1530 Comm: khungtaskd Not tainted 4.14.266-syzkaller #0 [ 1001.954950] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.964289] Call Trace: [ 1001.966869] dump_stack+0x1b2/0x281 [ 1001.970476] panic+0x1f9/0x42d [ 1001.973647] ? add_taint.cold+0x16/0x16 [ 1001.977793] watchdog+0x5ca/0xb40 [ 1001.981237] ? hungtask_pm_notify+0x50/0x50 [ 1001.985539] kthread+0x30d/0x420 [ 1001.988885] ? kthread_create_on_node+0xd0/0xd0 [ 1001.993533] ret_from_fork+0x24/0x30 [ 1001.997520] Kernel Offset: disabled [ 1002.001139] Rebooting in 86400 seconds..