[ 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 '10.128.0.82' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 857.946200] INFO: task syz-executor410:7987 blocked for more than 140 seconds. [ 857.953867] Not tainted 4.14.295-syzkaller #0 [ 857.960163] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 857.968563] syz-executor410 D28696 7987 7985 0x00000004 [ 857.974187] Call Trace: [ 857.977529] __schedule+0x88b/0x1de0 [ 857.981686] ? lock_acquire+0x170/0x3f0 [ 857.986223] ? io_schedule_timeout+0x140/0x140 [ 857.990977] ? _raw_spin_unlock+0x29/0x40 [ 857.995403] ? fuse_writepage_locked+0xe80/0xe80 [ 858.000401] schedule+0x8d/0x1b0 [ 858.004121] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 858.009847] ? fuse_do_ioctl+0x1570/0x1570 [ 858.014176] ? end_page_writeback+0xe3/0x1c0 [ 858.018914] ? wait_woken+0x230/0x230 [ 858.025858] fuse_launder_page+0xa2/0xd0 [ 858.029979] invalidate_inode_pages2_range+0x547/0xc00 [ 858.035296] ? clear_shadow_entry+0x160/0x160 [ 858.040188] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 858.045126] ? fuse_file_alloc+0x1ca/0x260 [ 858.049521] ? _raw_spin_unlock+0x29/0x40 [ 858.054265] ? fuse_do_open+0x18e/0x460 [ 858.058385] fuse_finish_open+0x262/0x500 [ 858.062799] fuse_open_common+0x234/0x290 [ 858.067169] do_dentry_open+0x44b/0xec0 [ 858.071353] ? fuse_open_common+0x290/0x290 [ 858.075752] ? __inode_permission+0xcd/0x2f0 [ 858.081222] vfs_open+0x105/0x220 [ 858.084784] path_openat+0x628/0x2970 [ 858.088664] ? path_lookupat+0x780/0x780 [ 858.093264] ? trace_hardirqs_on+0x10/0x10 [ 858.097561] do_filp_open+0x179/0x3c0 [ 858.101541] ? may_open_dev+0xe0/0xe0 [ 858.105363] ? lock_downgrade+0x740/0x740 [ 858.109859] ? do_raw_spin_unlock+0x164/0x220 [ 858.114492] ? _raw_spin_unlock+0x29/0x40 [ 858.118730] ? __alloc_fd+0x1be/0x490 [ 858.122633] do_sys_open+0x296/0x410 [ 858.126567] ? filp_open+0x60/0x60 [ 858.130316] ? do_syscall_64+0x4c/0x640 [ 858.134282] ? compat_SyS_openat+0x30/0x30 [ 858.138741] do_syscall_64+0x1d5/0x640 [ 858.142725] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.148086] RIP: 0033:0x7f60b807d4e9 [ 858.151988] RSP: 002b:00007f60b802e2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 858.160069] RAX: ffffffffffffffda RBX: 00007f60b810e4c0 RCX: 00007f60b807d4e9 [ 858.167497] RDX: 00007f60b807d4e9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 858.175049] RBP: 00007f60b80db164 R08: 0000000000000000 R09: 0000000000000000 [ 858.182380] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 858.189881] R13: 00007f60b80d7158 R14: 00007f60b80d9160 R15: 00007f60b810e4c8 [ 858.197921] [ 858.197921] Showing all locks held in the system: [ 858.204421] 1 lock held by khungtaskd/1534: [ 858.208958] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.218288] 1 lock held by in:imklog/7704: [ 858.222708] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 858.231579] 2 locks held by syz-executor410/7987: [ 858.236771] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 858.245639] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 858.256000] [ 858.257625] ============================================= [ 858.257625] [ 858.264990] NMI backtrace for cpu 1 [ 858.268735] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.295-syzkaller #0 [ 858.276367] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 858.286718] Call Trace: [ 858.289526] dump_stack+0x1b2/0x281 [ 858.293351] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.298969] ? irq_force_complete_move+0x350/0x350 [ 858.303974] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.309342] watchdog+0x5b9/0xb40 [ 858.313140] ? hungtask_pm_notify+0x50/0x50 [ 858.317447] kthread+0x30d/0x420 [ 858.320888] ? kthread_create_on_node+0xd0/0xd0 [ 858.325809] ret_from_fork+0x24/0x30 [ 858.329644] Sending NMI from CPU 1 to CPUs 0: [ 858.334388] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8724544e [ 858.335331] Kernel panic - not syncing: hung_task: blocked tasks [ 858.347753] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.295-syzkaller #0 [ 858.355184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 858.364527] Call Trace: [ 858.367135] dump_stack+0x1b2/0x281 [ 858.370754] panic+0x1f9/0x42d [ 858.374062] ? add_taint.cold+0x16/0x16 [ 858.378304] watchdog+0x5ca/0xb40 [ 858.381748] ? hungtask_pm_notify+0x50/0x50 [ 858.386059] kthread+0x30d/0x420 [ 858.389435] ? kthread_create_on_node+0xd0/0xd0 [ 858.394092] ret_from_fork+0x24/0x30 [ 858.398159] Kernel Offset: disabled [ 858.401795] Rebooting in 86400 seconds..