[ 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 '10.128.0.168' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 770.947041] kworker/dying (32) used greatest stack depth: 24744 bytes left [ 1001.331011] INFO: task syz-executor401:7996 blocked for more than 140 seconds. [ 1001.338455] Not tainted 4.14.298-syzkaller #0 [ 1001.343987] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.352009] syz-executor401 D28376 7996 7994 0x00000004 [ 1001.357638] Call Trace: [ 1001.360213] __schedule+0x88b/0x1de0 [ 1001.363965] ? lock_acquire+0x170/0x3f0 [ 1001.367937] ? io_schedule_timeout+0x140/0x140 [ 1001.372549] ? _raw_spin_unlock+0x29/0x40 [ 1001.376690] ? fuse_writepage_locked+0xe80/0xe80 [ 1001.381478] schedule+0x8d/0x1b0 [ 1001.384838] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 1001.390442] ? fuse_do_ioctl+0x1570/0x1570 [ 1001.394711] ? end_page_writeback+0xe3/0x1c0 [ 1001.399114] ? wait_woken+0x230/0x230 [ 1001.402959] fuse_launder_page+0xa2/0xd0 [ 1001.407015] invalidate_inode_pages2_range+0x547/0xc00 [ 1001.412322] ? clear_shadow_entry+0x160/0x160 [ 1001.416811] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 1001.421768] ? fuse_file_alloc+0x1ca/0x260 [ 1001.425999] ? _raw_spin_unlock+0x29/0x40 [ 1001.430125] ? fuse_do_open+0x18e/0x460 [ 1001.434127] fuse_finish_open+0x262/0x500 [ 1001.438268] fuse_open_common+0x234/0x290 [ 1001.442444] do_dentry_open+0x44b/0xec0 [ 1001.446504] ? fuse_open_common+0x290/0x290 [ 1001.450862] ? __inode_permission+0xcd/0x2f0 [ 1001.455260] vfs_open+0x105/0x220 [ 1001.458694] path_openat+0x628/0x2970 [ 1001.462535] ? path_lookupat+0x780/0x780 [ 1001.466586] ? trace_hardirqs_on+0x10/0x10 [ 1001.471381] do_filp_open+0x179/0x3c0 [ 1001.475178] ? may_open_dev+0xe0/0xe0 [ 1001.478959] ? lock_downgrade+0x740/0x740 [ 1001.483283] ? do_raw_spin_unlock+0x164/0x220 [ 1001.487767] ? _raw_spin_unlock+0x29/0x40 [ 1001.491938] ? __alloc_fd+0x1be/0x490 [ 1001.495739] do_sys_open+0x296/0x410 [ 1001.499434] ? filp_open+0x60/0x60 [ 1001.503001] ? do_syscall_64+0x4c/0x640 [ 1001.506970] ? compat_SyS_openat+0x30/0x30 [ 1001.511231] do_syscall_64+0x1d5/0x640 [ 1001.515112] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.520304] [ 1001.520304] Showing all locks held in the system: [ 1001.526662] 1 lock held by khungtaskd/1533: [ 1001.531134] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.540171] 1 lock held by in:imklog/7705: [ 1001.544424] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 1001.552905] 2 locks held by syz-executor401/7996: [ 1001.557729] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 1001.566164] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 1001.576219] [ 1001.577833] ============================================= [ 1001.577833] [ 1001.584863] NMI backtrace for cpu 0 [ 1001.588478] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.298-syzkaller #0 [ 1001.595911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 1001.605246] Call Trace: [ 1001.607817] dump_stack+0x1b2/0x281 [ 1001.611422] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.615893] ? irq_force_complete_move+0x350/0x350 [ 1001.620888] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1001.626144] watchdog+0x5b9/0xb40 [ 1001.629576] ? hungtask_pm_notify+0x50/0x50 [ 1001.633875] kthread+0x30d/0x420 [ 1001.637217] ? kthread_create_on_node+0xd0/0xd0 [ 1001.641864] ret_from_fork+0x24/0x30 [ 1001.645641] Sending NMI from CPU 0 to CPUs 1: [ 1001.650487] NMI backtrace for cpu 1 [ 1001.650491] CPU: 1 PID: 4607 Comm: systemd-journal Not tainted 4.14.298-syzkaller #0 [ 1001.650496] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 1001.650499] task: ffff8880a232a400 task.stack: ffff8880a2330000 [ 1001.650501] RIP: 0010:lock_acquire+0x1a2/0x3f0 [ 1001.650504] RSP: 0018:ffff8880a2337a08 EFLAGS: 00000002 [ 1001.650515] RAX: 0000000000000007 RBX: ffff8880a232a400 RCX: 000000000000141d [ 1001.650519] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880a232ac84 [ 1001.650522] RBP: ffffffff8c051a20 R08: ffffffff8b9a9be8 R09: 00000000000c0001 [ 1001.650526] R10: ffff8880a232ac88 R11: ffff8880a232a400 R12: 0000000000000000 [ 1001.650529] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 [ 1001.650533] FS: 00007f8f496748c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 1001.650536] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.650539] CR2: 00007f8f46a48000 CR3: 00000000a2390000 CR4: 00000000003406e0 [ 1001.650543] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.650546] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.650548] Call Trace: [ 1001.650550] _raw_spin_lock_irqsave+0x8c/0xc0 [ 1001.650553] ? debug_object_activate+0x10f/0x490 [ 1001.650556] debug_object_activate+0x10f/0x490 [ 1001.650558] ? debug_object_assert_init+0x2d0/0x2d0 [ 1001.650561] ? terminate_walk+0x183/0x530 [ 1001.650563] ? kfree+0x14a/0x250 [ 1001.650565] ? apparmor_file_free_security+0x7e/0xb0 [ 1001.650568] ? get_max_files+0x10/0x10 [ 1001.650570] __call_rcu.constprop.0+0x31/0x7d0 [ 1001.650573] ? percpu_counter_add_batch+0xf8/0x160 [ 1001.650575] put_filp+0x75/0x90 [ 1001.650577] path_openat+0x6ce/0x2970 [ 1001.650580] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 1001.650582] ? path_lookupat+0x780/0x780 [ 1001.650584] ? trace_hardirqs_on+0x10/0x10 [ 1001.650586] ? getname+0x20/0x20 [ 1001.650589] do_filp_open+0x179/0x3c0 [ 1001.650591] ? may_open_dev+0xe0/0xe0 [ 1001.650593] ? lock_downgrade+0x740/0x740 [ 1001.650596] ? do_raw_spin_unlock+0x164/0x220 [ 1001.650598] ? _raw_spin_unlock+0x29/0x40 [ 1001.650600] ? __alloc_fd+0x1be/0x490 [ 1001.650602] do_sys_open+0x296/0x410 [ 1001.650604] ? filp_open+0x60/0x60 [ 1001.650607] ? do_syscall_64+0x4c/0x640 [ 1001.650609] ? do_sys_open+0x410/0x410 [ 1001.650611] do_syscall_64+0x1d5/0x640 [ 1001.650614] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.650615] Code: fc ff df 65 48 8b 1c 25 c0 7f 02 00 48 8d bb 84 08 00 00 48 83 c4 20 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 <38> d0 7c 08 84 d2 0f 85 0d 02 00 00 48 c7 c0 c8 9e f0 88 48 ba [ 1001.651641] Kernel panic - not syncing: hung_task: blocked tasks [ 1001.903304] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.298-syzkaller #0 [ 1001.910727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 1001.920061] Call Trace: [ 1001.922632] dump_stack+0x1b2/0x281 [ 1001.926236] panic+0x1f9/0x42d [ 1001.929404] ? add_taint.cold+0x16/0x16 [ 1001.933359] watchdog+0x5ca/0xb40 [ 1001.936787] ? hungtask_pm_notify+0x50/0x50 [ 1001.941090] kthread+0x30d/0x420 [ 1001.944436] ? kthread_create_on_node+0xd0/0xd0 [ 1001.949081] ret_from_fork+0x24/0x30 [ 1001.953124] Kernel Offset: disabled [ 1001.956739] Rebooting in 86400 seconds..