[ 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 '10.128.0.106' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 857.991345] INFO: task syz-executor374:7984 blocked for more than 140 seconds. [ 857.999123] Not tainted 4.14.304-syzkaller #0 [ 858.005275] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.013853] syz-executor374 D28448 7984 7982 0x00000004 [ 858.019466] Call Trace: [ 858.022092] __schedule+0x88b/0x1de0 [ 858.025825] ? lock_acquire+0x170/0x3f0 [ 858.029868] ? io_schedule_timeout+0x140/0x140 [ 858.035024] ? _raw_spin_unlock+0x29/0x40 [ 858.039172] ? fuse_writepage_locked+0xe80/0xe80 [ 858.044059] schedule+0x8d/0x1b0 [ 858.047452] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 858.053176] ? fuse_do_ioctl+0x1570/0x1570 [ 858.057413] ? end_page_writeback+0xe3/0x1c0 [ 858.061872] ? wait_woken+0x230/0x230 [ 858.065719] fuse_launder_page+0xa2/0xd0 [ 858.070653] invalidate_inode_pages2_range+0x547/0xc00 [ 858.076185] ? clear_shadow_entry+0x160/0x160 [ 858.080696] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 858.085768] ? fuse_file_alloc+0x1ca/0x260 [ 858.090014] ? _raw_spin_unlock+0x29/0x40 [ 858.094309] ? fuse_do_open+0x18e/0x460 [ 858.098288] fuse_finish_open+0x262/0x500 [ 858.102479] fuse_open_common+0x234/0x290 [ 858.106624] do_dentry_open+0x44b/0xec0 [ 858.110608] ? fuse_open_common+0x290/0x290 [ 858.114974] ? __inode_permission+0xcd/0x2f0 [ 858.119383] vfs_open+0x105/0x220 [ 858.122881] path_openat+0x628/0x2970 [ 858.126677] ? path_lookupat+0x780/0x780 [ 858.130725] ? trace_hardirqs_on+0x10/0x10 [ 858.134999] do_filp_open+0x179/0x3c0 [ 858.138806] ? may_open_dev+0xe0/0xe0 [ 858.142643] ? lock_downgrade+0x740/0x740 [ 858.146782] ? do_raw_spin_unlock+0x164/0x220 [ 858.151311] ? _raw_spin_unlock+0x29/0x40 [ 858.155447] ? __alloc_fd+0x1be/0x490 [ 858.159226] do_sys_open+0x296/0x410 [ 858.163477] ? filp_open+0x60/0x60 [ 858.167019] ? do_syscall_64+0x4c/0x640 [ 858.170968] ? do_sys_open+0x410/0x410 [ 858.174896] do_syscall_64+0x1d5/0x640 [ 858.178782] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 858.183997] RIP: 0033:0x7f6be7bfa4c9 [ 858.187805] RSP: 002b:00007f6be7bab2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 858.196033] RAX: ffffffffffffffda RBX: 00007f6be7c8b4c0 RCX: 00007f6be7bfa4c9 [ 858.203537] RDX: 0000000000000000 RSI: 0000000000003f00 RDI: 0000000020000080 [ 858.210798] RBP: 00007f6be7c58164 R08: 0000000000000000 R09: 0000000000000000 [ 858.218643] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 858.226084] R13: 00007f6be7c54158 R14: 00007f6be7c56160 R15: 00007f6be7c8b4c8 [ 858.233457] [ 858.233457] Showing all locks held in the system: [ 858.239795] 1 lock held by khungtaskd/1534: [ 858.244903] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.254125] 1 lock held by systemd-journal/4625: [ 858.259161] #0: (&rq->lock){-.-.}, at: [] pick_next_task_fair+0x554/0x1450 [ 858.268091] 2 locks held by syz-executor374/7984: [ 858.273096] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 858.282014] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 858.292200] [ 858.293826] ============================================= [ 858.293826] [ 858.301647] NMI backtrace for cpu 1 [ 858.305322] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.304-syzkaller #0 [ 858.312858] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 [ 858.322498] Call Trace: [ 858.325166] dump_stack+0x1b2/0x281 [ 858.329023] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.333504] ? irq_force_complete_move+0x350/0x350 [ 858.338422] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.343748] watchdog+0x5b9/0xb40 [ 858.347206] ? hungtask_pm_notify+0x50/0x50 [ 858.351599] kthread+0x30d/0x420 [ 858.355081] ? kthread_create_on_node+0xd0/0xd0 [ 858.359878] ret_from_fork+0x24/0x30 [ 858.363675] Sending NMI from CPU 1 to CPUs 0: [ 858.368514] NMI backtrace for cpu 0 [ 858.368518] CPU: 0 PID: 4625 Comm: systemd-journal Not tainted 4.14.304-syzkaller #0 [ 858.368522] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 [ 858.368525] task: ffff8880a11f2180 task.stack: ffff8880a11f8000 [ 858.368527] RIP: 0010:lock_unpin_lock+0x0/0x410 [ 858.368530] RSP: 0018:ffff8880a11ffaa8 EFLAGS: 00000046 [ 858.368534] RAX: ffff8880a11ffc10 RBX: 000000010000da89 RCX: 1ffffffff0f13638 [ 858.368537] RDX: dffffc0000000000 RSI: 000000000000e3f4 RDI: ffff8880ba434418 [ 858.368540] RBP: ffff8880ba434400 R08: ffff8880ba434510 R09: ffff8880a11f2358 [ 858.368543] R10: ffff8880a11f2388 R11: 0000000000000000 R12: 0000000000000000 [ 858.368546] R13: 000000c7dabaee74 R14: ffff8880a11f8000 R15: dffffc0000000000 [ 858.368549] FS: 00007ffb4071c8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 858.368552] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 858.368555] CR2: 00007ffb3daeb010 CR3: 00000000a129f000 CR4: 00000000003406f0 [ 858.368558] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 858.368561] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 858.368563] Call Trace: [ 858.368565] pick_next_task_fair+0x1d5/0x1450 [ 858.368567] ? load_balance+0x2120/0x2120 [ 858.368569] __schedule+0x502/0x1de0 [ 858.368571] ? lock_downgrade+0x740/0x740 [ 858.368573] ? io_schedule_timeout+0x140/0x140 [ 858.368576] ? __mutex_unlock_slowpath+0x75/0x770 [ 858.368578] schedule+0x8d/0x1b0 [ 858.368580] schedule_hrtimeout_range_clock+0x2d0/0x320 [ 858.368582] ? hrtimer_nanosleep_restart+0x130/0x130 [ 858.368585] ? lock_acquire+0x170/0x3f0 [ 858.368587] ? lock_downgrade+0x740/0x740 [ 858.368589] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 858.368591] ep_poll+0x85e/0xa50 [ 858.368593] ? ep_poll_readyevents_proc+0x90/0x90 [ 858.368596] ? __secure_computing+0x1fe/0x450 [ 858.368598] ? wake_up_q+0xd0/0xd0 [ 858.368600] SyS_epoll_wait+0x150/0x1a0 [ 858.368602] ? SyS_epoll_ctl+0x2780/0x2780 [ 858.368604] do_syscall_64+0x1d5/0x640 [ 858.368606] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 858.368608] RIP: 0033:0x7ffb3f9e52e3 [ 858.368611] RSP: 002b:00007ffcf0635618 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 [ 858.368616] RAX: ffffffffffffffda RBX: 0000563c734211e0 RCX: 00007ffb3f9e52e3 [ 858.368619] RDX: 0000000000000013 RSI: 00007ffcf0635620 RDI: 0000000000000008 [ 858.368622] RBP: 00007ffcf0635810 R08: 00007ffcf0658000 R09: 000000dd6a6b62b6 [ 858.368625] R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffcf0635620 [ 858.368628] R13: 0000000000000001 R14: ffffffffffffffff R15: 0005f34145ae10e9 [ 858.368629] Code: 7c ff ff ff e8 c2 c0 3d 00 e9 56 ff ff ff e8 a8 c1 3d 00 e9 d0 fe ff ff e8 7e c2 3d 00 e9 3e fe ff ff 66 0f 1f 84 00 00 00 00 00 <41> 57 41 56 41 55 41 54 49 89 fc 55 53 48 83 ec 58 48 c7 44 24 [ 858.369196] Kernel panic - not syncing: hung_task: blocked tasks [ 858.641689] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.304-syzkaller #0 [ 858.649109] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 [ 858.658453] Call Trace: [ 858.661030] dump_stack+0x1b2/0x281 [ 858.664777] panic+0x1f9/0x42d [ 858.667961] ? add_taint.cold+0x16/0x16 [ 858.671918] watchdog+0x5ca/0xb40 [ 858.675347] ? hungtask_pm_notify+0x50/0x50 [ 858.679677] kthread+0x30d/0x420 [ 858.683059] ? kthread_create_on_node+0xd0/0xd0 [ 858.687819] ret_from_fork+0x24/0x30 [ 858.691829] Kernel Offset: disabled [ 858.695468] Rebooting in 86400 seconds..