[ 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 '10.128.0.238' (ECDSA) to the list of known hosts. syzkaller login: [ 597.372874] IPVS: ftp: loaded support on port[0] = 21 executing program [ 857.972635] INFO: task syz-executor178:8016 blocked for more than 140 seconds. [ 857.980079] Not tainted 4.14.284-syzkaller #0 [ 857.986195] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 857.994213] syz-executor178 D28912 8016 7992 0x00000004 [ 857.999822] Call Trace: [ 858.002416] __schedule+0x88b/0x1de0 [ 858.006397] ? io_schedule_timeout+0x140/0x140 [ 858.010973] ? mark_held_locks+0xa6/0xf0 [ 858.015069] ? _raw_spin_unlock_irq+0x24/0x80 [ 858.019550] ? rwsem_down_write_failed+0x33e/0x6d0 [ 858.024523] schedule+0x8d/0x1b0 [ 858.027877] rwsem_down_write_failed+0x343/0x6d0 [ 858.032659] ? rwsem_down_read_failed_killable+0x520/0x520 [ 858.038269] ? do_raw_spin_unlock+0x164/0x220 [ 858.042836] ? _raw_spin_unlock+0x29/0x40 [ 858.046998] ? writeback_single_inode+0xeb/0x370 [ 858.051802] call_rwsem_down_write_failed+0x13/0x20 [ 858.056856] down_write+0x4f/0x90 [ 858.060302] ? fuse_flush+0x1c7/0x520 [ 858.064159] fuse_flush+0x1c7/0x520 [ 858.067774] ? __close_fd+0x146/0x230 [ 858.071556] ? fuse_lock_owner_id+0x120/0x120 [ 858.076089] ? lock_acquire+0x170/0x3f0 [ 858.080058] ? lock_downgrade+0x740/0x740 [ 858.084264] ? fuse_lock_owner_id+0x120/0x120 [ 858.088750] filp_close+0x9d/0x140 [ 858.092270] __close_fd+0x151/0x230 [ 858.095923] SyS_close+0x42/0x90 [ 858.099292] ? filp_close+0x140/0x140 [ 858.103159] do_syscall_64+0x1d5/0x640 [ 858.107041] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.112208] RIP: 0033:0x7f9499f53a4b [ 858.116523] RSP: 002b:00007ffd91fdfb90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 858.124312] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f9499f53a4b [ 858.131591] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 858.138884] RBP: 0000000000091eca R08: 0000000000000000 R09: 0000000000000008 [ 858.146219] R10: 0000000000000000 R11: 0000000000000293 R12: 00007f949a0244dc [ 858.153503] R13: 00007ffd91fdfbf0 R14: 0000000000000032 R15: 00007f949a0244c0 [ 858.160788] INFO: task syz-executor178:8017 blocked for more than 140 seconds. [ 858.168206] Not tainted 4.14.284-syzkaller #0 [ 858.173245] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.181196] syz-executor178 D28464 8017 7992 0x00000004 [ 858.186847] Call Trace: [ 858.189426] __schedule+0x88b/0x1de0 [ 858.193167] ? lock_acquire+0x170/0x3f0 [ 858.197137] ? io_schedule_timeout+0x140/0x140 [ 858.201697] ? _raw_spin_unlock+0x29/0x40 [ 858.205897] ? fuse_writepage_locked+0xe80/0xe80 [ 858.210641] schedule+0x8d/0x1b0 [ 858.214034] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 858.219735] ? fuse_do_ioctl+0x1570/0x1570 [ 858.223995] ? end_page_writeback+0xe3/0x1c0 [ 858.228424] ? wait_woken+0x230/0x230 [ 858.232223] fuse_launder_page+0xa2/0xd0 [ 858.236328] invalidate_inode_pages2_range+0x547/0xc00 [ 858.241599] ? clear_shadow_entry+0x160/0x160 [ 858.246672] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 858.251596] ? fuse_file_alloc+0x1ca/0x260 [ 858.255859] ? _raw_spin_unlock+0x29/0x40 [ 858.260002] ? fuse_do_open+0x18e/0x460 [ 858.264026] fuse_finish_open+0x262/0x500 [ 858.268189] fuse_open_common+0x234/0x290 [ 858.272321] do_dentry_open+0x44b/0xec0 [ 858.276322] ? fuse_open_common+0x290/0x290 [ 858.280633] ? __inode_permission+0xcd/0x2f0 [ 858.285072] vfs_open+0x105/0x220 [ 858.288539] path_openat+0x628/0x2970 [ 858.292318] ? path_lookupat+0x780/0x780 [ 858.296396] ? trace_hardirqs_on+0x10/0x10 [ 858.300622] do_filp_open+0x179/0x3c0 [ 858.304442] ? may_open_dev+0xe0/0xe0 [ 858.308236] ? lock_downgrade+0x740/0x740 [ 858.312380] ? do_raw_spin_unlock+0x164/0x220 [ 858.316900] ? _raw_spin_unlock+0x29/0x40 [ 858.321043] ? __alloc_fd+0x1be/0x490 [ 858.324900] do_sys_open+0x296/0x410 [ 858.328603] ? filp_open+0x60/0x60 [ 858.332121] ? do_syscall_64+0x4c/0x640 [ 858.336117] ? do_sys_open+0x410/0x410 [ 858.339997] do_syscall_64+0x1d5/0x640 [ 858.343910] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.349087] RIP: 0033:0x7f9499f931c9 [ 858.352813] RSP: 002b:00007f9499f432f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 858.360507] RAX: ffffffffffffffda RBX: 00007f949a0244c0 RCX: 00007f9499f931c9 [ 858.367800] RDX: 0000000000000000 RSI: 0000000000000600 RDI: 0000000020000100 [ 858.375418] RBP: 00007f9499ff13ac R08: 0000000000000000 R09: 0000000000000000 [ 858.382718] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 858.389980] R13: 00007f9499fed3a0 R14: 00007f9499fef3a8 R15: 00007f949a0244c8 [ 858.397294] [ 858.397294] Showing all locks held in the system: [ 858.403671] 1 lock held by khungtaskd/1533: [ 858.408022] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.417122] 1 lock held by syz-executor178/8016: [ 858.421864] #0: (&sb->s_type->i_mutex_key#18){+.+.}, at: [] fuse_flush+0x1c7/0x520 [ 858.431398] 2 locks held by syz-executor178/8017: [ 858.436282] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 858.444729] #1: (&sb->s_type->i_mutex_key#18){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 858.454777] [ 858.456394] ============================================= [ 858.456394] [ 858.463428] NMI backtrace for cpu 0 [ 858.467047] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.284-syzkaller #0 [ 858.474570] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.483896] Call Trace: [ 858.486461] dump_stack+0x1b2/0x281 [ 858.490064] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.495057] ? irq_force_complete_move+0x350/0x350 [ 858.499978] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.505231] watchdog+0x5b9/0xb40 [ 858.508664] ? hungtask_pm_notify+0x50/0x50 [ 858.512965] kthread+0x30d/0x420 [ 858.516305] ? kthread_create_on_node+0xd0/0xd0 [ 858.520956] ret_from_fork+0x24/0x30 [ 858.524728] Sending NMI from CPU 0 to CPUs 1: [ 858.529267] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff872480fe [ 858.530721] Kernel panic - not syncing: hung_task: blocked tasks [ 858.542584] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.284-syzkaller #0 [ 858.550005] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.559331] Call Trace: [ 858.561898] dump_stack+0x1b2/0x281 [ 858.565509] panic+0x1f9/0x42d [ 858.568678] ? add_taint.cold+0x16/0x16 [ 858.572631] watchdog+0x5ca/0xb40 [ 858.576058] ? hungtask_pm_notify+0x50/0x50 [ 858.580369] kthread+0x30d/0x420 [ 858.583712] ? kthread_create_on_node+0xd0/0xd0 [ 858.588358] ret_from_fork+0x24/0x30 [ 858.592337] Kernel Offset: disabled [ 858.595957] Rebooting in 86400 seconds..