[ 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 '10.128.0.101' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 1001.312312] INFO: task syz-executor367:7987 blocked for more than 140 seconds. [ 1001.319724] Not tainted 4.14.281-syzkaller #0 [ 1001.325686] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.333674] syz-executor367 D28696 7987 7982 0x00000004 [ 1001.339289] Call Trace: [ 1001.341861] __schedule+0x88b/0x1de0 [ 1001.345621] ? lock_acquire+0x170/0x3f0 [ 1001.349588] ? io_schedule_timeout+0x140/0x140 [ 1001.354189] ? _raw_spin_unlock+0x29/0x40 [ 1001.358328] ? fuse_writepage_locked+0xe80/0xe80 [ 1001.363123] schedule+0x8d/0x1b0 [ 1001.366474] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 1001.372077] ? fuse_do_ioctl+0x1570/0x1570 [ 1001.376331] ? end_page_writeback+0xe3/0x1c0 [ 1001.380729] ? wait_woken+0x230/0x230 [ 1001.384572] fuse_launder_page+0xa2/0xd0 [ 1001.388621] invalidate_inode_pages2_range+0x547/0xc00 [ 1001.393927] ? clear_shadow_entry+0x160/0x160 [ 1001.398414] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 1001.403377] ? fuse_file_alloc+0x1ca/0x260 [ 1001.407600] ? _raw_spin_unlock+0x29/0x40 [ 1001.411724] ? fuse_do_open+0x18e/0x460 [ 1001.415726] fuse_finish_open+0x262/0x500 [ 1001.419864] fuse_open_common+0x234/0x290 [ 1001.424048] do_dentry_open+0x44b/0xec0 [ 1001.428005] ? fuse_open_common+0x290/0x290 [ 1001.432347] ? __inode_permission+0xcd/0x2f0 [ 1001.436744] vfs_open+0x105/0x220 [ 1001.440175] path_openat+0x628/0x2970 [ 1001.444020] ? path_lookupat+0x780/0x780 [ 1001.448155] ? trace_hardirqs_on+0x10/0x10 [ 1001.452425] do_filp_open+0x179/0x3c0 [ 1001.456211] ? may_open_dev+0xe0/0xe0 [ 1001.459999] ? lock_downgrade+0x740/0x740 [ 1001.464181] ? do_raw_spin_unlock+0x164/0x220 [ 1001.468663] ? _raw_spin_unlock+0x29/0x40 [ 1001.472825] ? __alloc_fd+0x1be/0x490 [ 1001.476615] do_sys_open+0x296/0x410 [ 1001.480303] ? filp_open+0x60/0x60 [ 1001.483874] ? do_syscall_64+0x4c/0x640 [ 1001.487831] ? compat_SyS_openat+0x30/0x30 [ 1001.492041] do_syscall_64+0x1d5/0x640 [ 1001.495949] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.501124] RIP: 0033:0x7f4c81d403e9 [ 1001.504863] RSP: 002b:00007f4c81cd02f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 1001.512599] RAX: ffffffffffffffda RBX: 00007f4c81dcf4d8 RCX: 00007f4c81d403e9 [ 1001.519858] RDX: 00007f4c81d403e9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 1001.527181] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1001.534480] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4c81dcf4d0 [ 1001.541743] R13: 00007fffbfc9234f R14: 00007f4c81d9c15c R15: 0030656c69662f2e [ 1001.549072] [ 1001.549072] Showing all locks held in the system: [ 1001.555428] 1 lock held by khungtaskd/1533: [ 1001.559779] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.568864] 2 locks held by syz-executor367/7987: [ 1001.573731] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 1001.582261] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 1001.592283] [ 1001.593894] ============================================= [ 1001.593894] [ 1001.600945] NMI backtrace for cpu 1 [ 1001.604613] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.281-syzkaller #0 [ 1001.612047] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.621376] Call Trace: [ 1001.623940] dump_stack+0x1b2/0x281 [ 1001.627543] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.632014] ? irq_force_complete_move+0x350/0x350 [ 1001.637350] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1001.642601] watchdog+0x5b9/0xb40 [ 1001.646031] ? hungtask_pm_notify+0x50/0x50 [ 1001.650325] kthread+0x30d/0x420 [ 1001.653666] ? kthread_create_on_node+0xd0/0xd0 [ 1001.658313] ret_from_fork+0x24/0x30 [ 1001.662075] Sending NMI from CPU 1 to CPUs 0: [ 1001.666924] NMI backtrace for cpu 0 [ 1001.666928] CPU: 0 PID: 8 Comm: rcu_preempt Not tainted 4.14.281-syzkaller #0 [ 1001.666932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.666935] task: ffff8880b5420200 task.stack: ffff8880b5428000 [ 1001.666937] RIP: 0010:reacquire_held_locks+0x5/0x3f0 [ 1001.666940] RSP: 0018:ffff8880b542fb60 EFLAGS: 00000046 [ 1001.666944] RAX: 0000000000000001 RBX: 1ffff11016a85f70 RCX: 1ffff11016a84151 [ 1001.666947] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8880b5420200 [ 1001.666950] RBP: 0000000000000000 R08: ffffffff8b9c9430 R09: 0000000000000001 [ 1001.666953] R10: 0000000000000000 R11: ffff8880b5420200 R12: 0000000000000000 [ 1001.666957] R13: ffffffff8bed1d40 R14: ffff8880b5420200 R15: 0000000000000001 [ 1001.666960] FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 1001.666963] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.666966] CR2: 00007fe9f23fc000 CR3: 00000000a2293000 CR4: 00000000003406f0 [ 1001.666969] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.666972] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.666973] Call Trace: [ 1001.666975] lock_release+0x36b/0x870 [ 1001.666977] ? lock_downgrade+0x740/0x740 [ 1001.666980] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.666983] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1001.666985] _raw_spin_unlock_irqrestore+0x1b/0xe0 [ 1001.666988] try_to_del_timer_sync+0xaf/0xe0 [ 1001.666990] ? detach_if_pending+0x430/0x430 [ 1001.666992] del_timer_sync+0x17c/0x240 [ 1001.666994] schedule_timeout+0x4b7/0xe90 [ 1001.666996] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1001.666999] ? usleep_range+0x130/0x130 [ 1001.667001] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1001.667003] ? prepare_to_swait+0x115/0x2a0 [ 1001.667005] ? run_timer_softirq+0x5a0/0x5a0 [ 1001.667008] rcu_gp_kthread+0xc0a/0x1e60 [ 1001.667010] ? force_qs_rnp+0x4f0/0x4f0 [ 1001.667012] ? force_qs_rnp+0x4f0/0x4f0 [ 1001.667014] kthread+0x30d/0x420 [ 1001.667016] ? kthread_create_on_node+0xd0/0xd0 [ 1001.667018] ret_from_fork+0x24/0x30 [ 1001.667020] Code: 24 68 4c 8b 54 24 60 0f b6 74 24 58 4c 8b 44 24 50 48 8b 54 24 48 e9 4e d5 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 48 63 c2 39 d6 <48> 8d 04 80 48 8d 84 c7 88 08 00 00 0f 86 40 02 00 00 83 ee 01 [ 1001.667630] Kernel panic - not syncing: hung_task: blocked tasks [ 1001.889764] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.281-syzkaller #0 [ 1001.897184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.906512] Call Trace: [ 1001.909080] dump_stack+0x1b2/0x281 [ 1001.912683] panic+0x1f9/0x42d [ 1001.915850] ? add_taint.cold+0x16/0x16 [ 1001.919801] watchdog+0x5ca/0xb40 [ 1001.923228] ? hungtask_pm_notify+0x50/0x50 [ 1001.927529] kthread+0x30d/0x420 [ 1001.930867] ? kthread_create_on_node+0xd0/0xd0 [ 1001.935510] ret_from_fork+0x24/0x30 [ 1001.939495] Kernel Offset: disabled [ 1001.943110] Rebooting in 86400 seconds..