[ 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 '10.128.0.233' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.774792] INFO: task syz-executor112:8124 blocked for more than 140 seconds. [ 717.782226] Not tainted 4.19.211-syzkaller #0 [ 717.788769] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.797028] syz-executor112 D27400 8124 8122 0x00000004 [ 717.802666] Call Trace: [ 717.805630] __schedule+0x887/0x2040 [ 717.809361] ? io_schedule_timeout+0x140/0x140 [ 717.813933] ? _raw_spin_unlock+0x29/0x40 [ 717.818441] schedule+0x8d/0x1b0 [ 717.821814] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.827859] ? fuse_do_ioctl+0x1850/0x1850 [ 717.832090] ? wait_woken+0x250/0x250 [ 717.836194] ? fuse_writepage_locked+0xb63/0x1010 [ 717.841041] ? fuse_writepage_locked+0x1010/0x1010 [ 717.846302] fuse_launder_page+0xb6/0xe0 [ 717.850391] invalidate_inode_pages2_range+0x795/0x1110 [ 717.856219] ? clear_shadow_entry+0x170/0x170 [ 717.860712] ? fuse_file_alloc+0x1d9/0x270 [ 717.865259] ? do_raw_spin_unlock+0x171/0x230 [ 717.869754] ? _raw_spin_unlock+0x29/0x40 [ 717.873885] ? fuse_do_open+0x1c4/0x500 [ 717.878156] fuse_finish_open+0x2e2/0x590 [ 717.882302] fuse_open_common+0x254/0x2c0 [ 717.886935] do_dentry_open+0x4aa/0x1160 [ 717.890990] ? fuse_open_common+0x2c0/0x2c0 [ 717.895563] ? inode_permission.part.0+0x10c/0x450 [ 717.900488] ? chown_common+0x550/0x550 [ 717.904445] ? inode_permission+0x3d/0x140 [ 717.908972] path_openat+0x793/0x2df0 [ 717.912780] ? path_lookupat+0x8d0/0x8d0 [ 717.917119] ? mark_held_locks+0xf0/0xf0 [ 717.921177] ? mark_held_locks+0xf0/0xf0 [ 717.925520] do_filp_open+0x18c/0x3f0 [ 717.929317] ? may_open_dev+0xf0/0xf0 [ 717.933100] ? lock_downgrade+0x720/0x720 [ 717.937522] ? lock_acquire+0x170/0x3c0 [ 717.941495] ? __alloc_fd+0x34/0x570 [ 717.945481] ? do_raw_spin_unlock+0x171/0x230 [ 717.949974] ? _raw_spin_unlock+0x29/0x40 [ 717.954103] ? __alloc_fd+0x28d/0x570 [ 717.958218] do_sys_open+0x3b3/0x520 [ 717.961936] ? filp_open+0x70/0x70 [ 717.965765] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.971128] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.976415] ? do_syscall_64+0x21/0x620 [ 717.980385] do_syscall_64+0xf9/0x620 [ 717.984171] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.989711] RIP: 0033:0x7fe7459584c9 [ 717.993424] Code: Bad RIP value. [ 717.997061] RSP: 002b:00007fe7459092f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 718.004838] RAX: ffffffffffffffda RBX: 00007fe7459e94c0 RCX: 00007fe7459584c9 [ 718.012098] RDX: 00007fe7459584c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 718.019401] RBP: 00007fe7459b6164 R08: 0000000000000000 R09: 0000000000000000 [ 718.026729] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 718.033983] R13: 00007fe7459b2158 R14: 00007fe7459b4160 R15: 00007fe7459e94c8 [ 718.041317] [ 718.041317] Showing all locks held in the system: [ 718.047728] 1 lock held by khungtaskd/1570: [ 718.052025] #0: 00000000e5d9d343 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.060674] 1 lock held by in:imklog/7810: [ 718.064954] #0: 00000000fc956106 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.072927] 2 locks held by syz-executor112/8124: [ 718.077786] #0: 000000002b2c7ec4 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 718.085826] #1: 000000009241ce8f (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 718.095401] [ 718.097022] ============================================= [ 718.097022] [ 718.104013] NMI backtrace for cpu 0 [ 718.107707] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.115155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 718.124583] Call Trace: [ 718.127160] dump_stack+0x1fc/0x2ef [ 718.130768] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.135243] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.139722] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.144981] watchdog+0x991/0xe60 [ 718.148416] ? reset_hung_task_detector+0x30/0x30 [ 718.153240] kthread+0x33f/0x460 [ 718.156585] ? kthread_park+0x180/0x180 [ 718.160542] ret_from_fork+0x24/0x30 [ 718.164327] Sending NMI from CPU 0 to CPUs 1: [ 718.168918] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 [ 718.169871] Kernel panic - not syncing: hung_task: blocked tasks [ 718.182590] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.190013] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 718.199343] Call Trace: [ 718.201916] dump_stack+0x1fc/0x2ef [ 718.205530] panic+0x26a/0x50e [ 718.208703] ? __warn_printk+0xf3/0xf3 [ 718.212573] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.217656] ? cpumask_next+0x3c/0x40 [ 718.221438] ? printk_safe_flush+0xd6/0x120 [ 718.225740] ? watchdog+0x991/0xe60 [ 718.229344] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.234777] watchdog+0x9a2/0xe60 [ 718.238216] ? reset_hung_task_detector+0x30/0x30 [ 718.243039] kthread+0x33f/0x460 [ 718.246386] ? kthread_park+0x180/0x180 [ 718.250343] ret_from_fork+0x24/0x30 [ 718.254303] Kernel Offset: disabled [ 718.257939] Rebooting in 86400 seconds..