[ 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 '10.128.0.32' (ECDSA) to the list of known hosts. syzkaller login: [ 721.425137][ T1660] INFO: task syz-executor217:8470 can't die for more than 143 seconds. [ 721.433684][ T1660] task:syz-executor217 state:R running task stack:27152 pid: 8470 ppid: 8468 flags:0x00004006 [ 721.447792][ T1660] Call Trace: [ 721.451168][ T1660] ? rcu_read_lock_sched_held+0x1c/0x70 [ 721.458075][ T1660] ? iget5_locked+0xac/0x2d0 [ 721.464260][ T1660] ? do_raw_spin_lock+0x120/0x2b0 [ 721.470638][ T1660] ? lock_release+0x1f2/0x710 [ 721.476168][ T1660] ? iget5_locked+0xcc/0x2d0 [ 721.480834][ T1660] ? lock_downgrade+0x6d0/0x6d0 [ 721.486901][ T1660] ? _raw_spin_lock+0x2a/0x40 [ 721.491690][ T1660] ? find_inode+0x109/0x220 [ 721.497600][ T1660] ? iget5_locked+0xac/0x2d0 [ 721.502332][ T1660] ? iget5_locked+0xcc/0x2d0 [ 721.508214][ T1660] ? fuse_inode_eq+0x80/0x80 [ 721.512924][ T1660] ? fuse_iget+0x271/0x610 [ 721.518651][ T1660] ? fuse_change_attributes+0x610/0x610 [ 721.524767][ T1660] ? fuse_simple_request+0x3e8/0xd10 [ 721.531859][ T1660] ? fuse_lookup_name+0x447/0x630 [ 721.537954][ T1660] ? fuse_create+0x30/0x30 [ 721.542405][ T1660] ? find_held_lock+0x2d/0x110 [ 721.548425][ T1660] ? fuse_lookup.part.0+0xdf/0x390 [ 721.553583][ T1660] ? fuse_lookup_name+0x630/0x630 [ 721.559927][ T1660] ? lockdep_init_map_type+0x2c3/0x790 [ 721.566178][ T1660] ? lockdep_init_map_type+0x2c3/0x790 [ 721.571707][ T1660] ? fuse_lookup+0x70/0x90 [ 721.577538][ T1660] ? __lookup_slow+0x24c/0x480 [ 721.582430][ T1660] ? page_put_link+0x210/0x210 [ 721.589001][ T1660] ? irq_entries_start+0x100/0x660 [ 721.594171][ T1660] ? irq_entries_start+0x100/0x660 [ 721.600720][ T1660] ? inode_permission.part.0+0xab/0x410 [ 721.607170][ T1660] ? walk_component+0x418/0x6a0 [ 721.612069][ T1660] ? handle_dots.part.0+0x1520/0x1520 [ 721.618803][ T1660] ? walk_component+0x6a0/0x6a0 [ 721.623729][ T1660] ? path_lookupat+0x1ba/0x830 [ 721.629811][ T1660] ? filename_lookup+0x19f/0x560 [ 721.636536][ T1660] ? may_linkat+0x2b0/0x2b0 [ 721.641075][ T1660] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 721.648751][ T1660] ? __check_object_size+0x171/0x3f0 [ 721.656987][ T1660] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.663268][ T1660] ? strncpy_from_user+0x2a0/0x3e0 [ 721.669831][ T1660] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.677124][ T1660] ? getname_flags.part.0+0x1dd/0x4f0 [ 721.682574][ T1660] ? __x64_sys_mount+0x1ea/0x300 [ 721.688784][ T1660] ? copy_mnt_ns+0xae0/0xae0 [ 721.693417][ T1660] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.700844][ T1660] ? do_syscall_64+0x2d/0x70 [ 721.706452][ T1660] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.712671][ T1660] [ 721.712671][ T1660] Showing all locks held in the system: [ 721.721690][ T1660] 2 locks held by kworker/0:0/5: [ 721.727786][ T1660] #0: ffff8880b9e34fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 [ 721.738325][ T1660] #1: ffff8880b9e20088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 [ 721.750695][ T1660] 1 lock held by khungtaskd/1660: [ 721.756768][ T1660] #0: ffffffff8b370ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.767582][ T1660] 1 lock held by in:imklog/8148: [ 721.772545][ T1660] #0: ffff888020370ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.783091][ T1660] 3 locks held by syz-executor217/8470: [ 721.789507][ T1660] [ 721.792046][ T1660] ============================================= [ 721.792046][ T1660] [ 721.801769][ T1660] Kernel panic - not syncing: hung_task: blocked tasks [ 721.808790][ T1660] CPU: 1 PID: 1660 Comm: khungtaskd Not tainted 5.11.0-rc4-next-20210121-syzkaller #0 [ 721.818492][ T1660] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.828569][ T1660] Call Trace: [ 721.831888][ T1660] dump_stack+0x107/0x163 [ 721.836310][ T1660] panic+0x306/0x73d [ 721.840222][ T1660] ? __warn_printk+0xf3/0xf3 [ 721.844854][ T1660] ? watchdog.cold+0x22d/0x248 [ 721.849686][ T1660] watchdog.cold+0x23e/0x248 [ 721.856727][ T1660] ? trace_sched_process_hang+0x280/0x280 [ 721.862470][ T1660] kthread+0x3b1/0x4a0 [ 721.866638][ T1660] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.872555][ T1660] ret_from_fork+0x1f/0x30 [ 721.877878][ T1660] Kernel Offset: disabled [ 721.882323][ T1660] Rebooting in 86400 seconds..