[ 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 '10.128.0.226' (ECDSA) to the list of known hosts. syzkaller login: [ 721.522629][ T1660] INFO: task syz-executor181:8479 can't die for more than 143 seconds. [ 721.531226][ T1660] task:syz-executor181 state:R running task stack:27512 pid: 8479 ppid: 8474 flags:0x00004006 [ 721.545593][ T1660] Call Trace: [ 721.548959][ T1660] ? find_held_lock+0x2d/0x110 [ 721.555107][ T1660] ? lock_release+0x710/0x710 [ 721.559836][ T1660] ? ilookup5_nowait+0x7e/0xb0 [ 721.566523][ T1660] ? do_raw_spin_unlock+0x171/0x230 [ 721.571816][ T1660] ? find_inode+0x109/0x220 [ 721.577748][ T1660] ? find_inode+0x109/0x220 [ 721.582316][ T1660] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.589181][ T1660] ? ilookup5_nowait+0x6f/0xb0 [ 721.594992][ T1660] ? iput.part.0+0x67/0x810 [ 721.599522][ T1660] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 721.608974][ T1660] ? iget5_locked+0x41/0x220 [ 721.614538][ T1660] ? fuse_inode_eq+0x80/0x80 [ 721.619185][ T1660] ? fuse_iget+0x24e/0x610 [ 721.625044][ T1660] ? fuse_change_attributes+0x610/0x610 [ 721.630631][ T1660] ? fuse_simple_request+0x3e8/0xd10 [ 721.637422][ T1660] ? fuse_lookup_name+0x447/0x630 [ 721.643392][ T1660] ? fuse_create+0x30/0x30 [ 721.648107][ T1660] ? find_held_lock+0x2d/0x110 [ 721.654608][ T1660] ? fuse_lookup.part.0+0xdf/0x390 [ 721.659763][ T1660] ? fuse_lookup_name+0x630/0x630 [ 721.666781][ T1660] ? lockdep_init_map_waits+0x26a/0x720 [ 721.672373][ T1660] ? fuse_lookup+0x70/0x90 [ 721.678164][ T1660] ? __lookup_slow+0x24c/0x480 [ 721.683980][ T1660] ? page_put_link+0x210/0x210 [ 721.688804][ T1660] ? inode_permission.part.0+0xab/0x410 [ 721.695810][ T1660] ? walk_component+0x418/0x6a0 [ 721.700693][ T1660] ? handle_dots.part.0+0x1520/0x1520 [ 721.707532][ T1660] ? walk_component+0x6a0/0x6a0 [ 721.713501][ T1660] ? path_lookupat+0x1ba/0x830 [ 721.718302][ T1660] ? filename_lookup+0x19f/0x560 [ 721.724630][ T1660] ? may_linkat+0x2b0/0x2b0 [ 721.729172][ T1660] ? __check_object_size+0x171/0x3f0 [ 721.737343][ T1660] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.744524][ T1660] ? strncpy_from_user+0x2a0/0x3e0 [ 721.749752][ T1660] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.757672][ T1660] ? getname_flags.part.0+0x1dd/0x4f0 [ 721.764184][ T1660] ? __x64_sys_name_to_handle_at+0x177/0x240 [ 721.770331][ T1660] ? do_sys_name_to_handle+0x4c0/0x4c0 [ 721.778787][ T1660] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.785789][ T1660] ? do_syscall_64+0x2d/0x70 [ 721.790420][ T1660] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.798389][ T1660] [ 721.798389][ T1660] Showing all locks held in the system: [ 721.807356][ T1660] 1 lock held by khungtaskd/1660: [ 721.813422][ T1660] #0: ffffffff8b363660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.824401][ T1660] 1 lock held by in:imklog/8178: [ 721.829365][ T1660] #0: ffff8880121e0370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.840182][ T1660] 2 locks held by syz-executor181/8479: [ 721.849576][ T1660] [ 721.851924][ T1660] ============================================= [ 721.851924][ T1660] [ 721.861919][ T1660] Kernel panic - not syncing: hung_task: blocked tasks [ 721.868790][ T1660] CPU: 0 PID: 1660 Comm: khungtaskd Not tainted 5.10.0-next-20201223-syzkaller #0 [ 721.878021][ T1660] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.888097][ T1660] Call Trace: [ 721.891397][ T1660] dump_stack+0x107/0x163 [ 721.895812][ T1660] panic+0x306/0x73d [ 721.899750][ T1660] ? __warn_printk+0xf3/0xf3 [ 721.904391][ T1660] ? watchdog.cold+0x22d/0x248 [ 721.909208][ T1660] watchdog.cold+0x23e/0x248 [ 721.913816][ T1660] ? trace_sched_process_hang+0x280/0x280 [ 721.919565][ T1660] kthread+0x3b1/0x4a0 [ 721.923751][ T1660] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.929671][ T1660] ret_from_fork+0x1f/0x30 [ 721.934865][ T1660] Kernel Offset: disabled [ 721.939255][ T1660] Rebooting in 86400 seconds..