[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.183' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 858.001796] INFO: task syz-executor618:7987 blocked for more than 140 seconds. [ 858.009261] Not tainted 4.14.298-syzkaller #0 [ 858.015734] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.023743] syz-executor618 D28384 7987 7985 0x00000004 [ 858.029353] Call Trace: [ 858.031980] __schedule+0x88b/0x1de0 [ 858.035683] ? lock_acquire+0x170/0x3f0 [ 858.039638] ? io_schedule_timeout+0x140/0x140 [ 858.044265] ? _raw_spin_unlock+0x29/0x40 [ 858.048495] ? fuse_writepage_locked+0xe80/0xe80 [ 858.053306] schedule+0x8d/0x1b0 [ 858.056665] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 858.062344] ? fuse_do_ioctl+0x1570/0x1570 [ 858.066579] ? end_page_writeback+0xe3/0x1c0 [ 858.070974] ? wait_woken+0x230/0x230 [ 858.074833] fuse_launder_page+0xa2/0xd0 [ 858.078956] invalidate_inode_pages2_range+0x547/0xc00 [ 858.084291] ? clear_shadow_entry+0x160/0x160 [ 858.088880] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 858.093865] ? fuse_file_alloc+0x1ca/0x260 [ 858.098095] ? _raw_spin_unlock+0x29/0x40 [ 858.102282] ? fuse_do_open+0x18e/0x460 [ 858.106246] fuse_finish_open+0x262/0x500 [ 858.110460] fuse_open_common+0x234/0x290 [ 858.114655] do_dentry_open+0x44b/0xec0 [ 858.118616] ? fuse_open_common+0x290/0x290 [ 858.122978] ? __inode_permission+0xcd/0x2f0 [ 858.127381] vfs_open+0x105/0x220 [ 858.130822] path_openat+0x628/0x2970 [ 858.134682] ? path_lookupat+0x780/0x780 [ 858.138734] ? trace_hardirqs_on+0x10/0x10 [ 858.143013] do_filp_open+0x179/0x3c0 [ 858.146804] ? may_open_dev+0xe0/0xe0 [ 858.150586] ? lock_downgrade+0x740/0x740 [ 858.154772] ? do_raw_spin_unlock+0x164/0x220 [ 858.159271] ? _raw_spin_unlock+0x29/0x40 [ 858.163493] ? __alloc_fd+0x1be/0x490 [ 858.167312] do_sys_open+0x296/0x410 [ 858.171352] ? filp_open+0x60/0x60 [ 858.174935] ? do_syscall_64+0x4c/0x640 [ 858.178898] ? compat_SyS_openat+0x30/0x30 [ 858.183174] do_syscall_64+0x1d5/0x640 [ 858.187050] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 858.192304] [ 858.192304] Showing all locks held in the system: [ 858.198787] 1 lock held by khungtaskd/1529: [ 858.203199] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.212329] 1 lock held by in:imklog/7672: [ 858.216655] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 858.225123] 2 locks held by syz-executor618/7987: [ 858.229956] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 858.238519] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 858.248569] [ 858.250178] ============================================= [ 858.250178] [ 858.257229] NMI backtrace for cpu 1 [ 858.260842] CPU: 1 PID: 1529 Comm: khungtaskd Not tainted 4.14.298-syzkaller #0 [ 858.268262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 858.277631] Call Trace: [ 858.280199] dump_stack+0x1b2/0x281 [ 858.283802] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.288303] ? irq_force_complete_move+0x350/0x350 [ 858.293208] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.298459] watchdog+0x5b9/0xb40 [ 858.301889] ? hungtask_pm_notify+0x50/0x50 [ 858.306187] kthread+0x30d/0x420 [ 858.309526] ? kthread_create_on_node+0xd0/0xd0 [ 858.314168] ret_from_fork+0x24/0x30 [ 858.317945] Sending NMI from CPU 1 to CPUs 0: [ 858.322747] NMI backtrace for cpu 0 [ 858.322751] CPU: 0 PID: 8 Comm: rcu_preempt Not tainted 4.14.298-syzkaller #0 [ 858.322756] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 858.322759] task: ffff8880b540e200 task.stack: ffff8880b5418000 [ 858.322761] RIP: 0010:do_raw_spin_lock+0xc6/0x200 [ 858.322764] RSP: 0018:ffff8880b541fd30 EFLAGS: 00000046 [ 858.322769] RAX: 0000000000000000 RBX: ffff8880b541fea0 RCX: 000000000000021f [ 858.322772] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffffff88f7ace4 [ 858.322776] RBP: ffffffff88f7ace0 R08: ffffffff8b9a0bf8 R09: 00000000000c009e [ 858.322779] R10: ffff8880b540ea88 R11: ffff8880b540e200 R12: ffffffff88f7ace8 [ 858.322783] R13: ffffffff88f7acf0 R14: ffff8880b541feb0 R15: ffff8880b541fea0 [ 858.322787] FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 858.322790] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 858.322793] CR2: 00007efffb86e000 CR3: 00000000a1bda000 CR4: 00000000003406f0 [ 858.322797] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 858.322800] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 858.322802] Call Trace: [ 858.322805] _raw_spin_lock_irqsave+0x94/0xc0 [ 858.322807] ? finish_swait+0xb2/0x260 [ 858.322809] finish_swait+0xb2/0x260 [ 858.322811] rcu_gp_kthread+0xc50/0x1e60 [ 858.322814] ? force_qs_rnp+0x4f0/0x4f0 [ 858.322816] ? force_qs_rnp+0x4f0/0x4f0 [ 858.322818] kthread+0x30d/0x420 [ 858.322821] ? kthread_create_on_node+0xd0/0xd0 [ 858.322823] ret_from_fork+0x24/0x30 [ 858.322824] Code: e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 08 01 00 00 8b 55 08 65 8b 05 fa bc bf 7e 39 c2 74 77 31 c0 ba 01 00 00 00 f0 0f b1 55 00 <85> c0 75 7b 65 8b 1d df bc bf 7e 48 b8 00 00 00 00 00 fc ff df [ 858.323497] Kernel panic - not syncing: hung_task: blocked tasks [ 858.494948] CPU: 1 PID: 1529 Comm: khungtaskd Not tainted 4.14.298-syzkaller #0 [ 858.502370] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 858.511792] Call Trace: [ 858.514357] dump_stack+0x1b2/0x281 [ 858.517962] panic+0x1f9/0x42d [ 858.521129] ? add_taint.cold+0x16/0x16 [ 858.525084] ? printk_safe_flush+0xa9/0x110 [ 858.529390] watchdog+0x5ca/0xb40 [ 858.532818] ? hungtask_pm_notify+0x50/0x50 [ 858.537112] kthread+0x30d/0x420 [ 858.540452] ? kthread_create_on_node+0xd0/0xd0 [ 858.545183] ret_from_fork+0x24/0x30 [ 858.549134] Kernel Offset: disabled [ 858.552747] Rebooting in 86400 seconds..