[ 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 '10.128.0.41' (ECDSA) to the list of known hosts. syzkaller login: [ 721.504675][ T1661] INFO: task syz-executor152:8538 can't die for more than 143 seconds. [ 721.513170][ T1661] task:syz-executor152 state:R running task stack:27904 pid: 8538 ppid: 8533 flags:0x00004006 [ 721.526688][ T1661] Call Trace: [ 721.530018][ T1661] ? lockdep_hardirqs_on_prepare+0x420/0x420 [ 721.537810][ T1661] ? lock_acquire+0xb8/0x750 [ 721.542445][ T1661] ? lock_acquire+0x2ad/0x750 [ 721.548370][ T1661] ? iget5_locked+0xcc/0x2d0 [ 721.552995][ T1661] ? _raw_spin_lock+0x2a/0x40 [ 721.558946][ T1661] ? _raw_spin_unlock+0x24/0x40 [ 721.564258][ T1661] ? find_inode+0x109/0x220 [ 721.569977][ T1661] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.576236][ T1661] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.581634][ T1661] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.588172][ T1661] ? iget5_locked+0xac/0x2d0 [ 721.592781][ T1661] ? iput.part.0+0x73/0x830 [ 721.598511][ T1661] ? iget5_locked+0xbd/0x2d0 [ 721.603125][ T1661] ? fuse_inode_eq+0x80/0x80 [ 721.608879][ T1661] ? iput+0x14/0x70 [ 721.612704][ T1661] ? fuse_iget+0x271/0x610 [ 721.619535][ T1661] ? fuse_change_attributes+0x610/0x610 [ 721.625947][ T1661] ? fuse_simple_request+0x3e8/0xd90 [ 721.631261][ T1661] ? fuse_lookup_name+0x447/0x630 [ 721.638106][ T1661] ? fuse_create+0x30/0x30 [ 721.642562][ T1661] ? find_held_lock+0x2d/0x110 [ 721.648875][ T1661] ? mark_held_locks+0x9f/0xe0 [ 721.653700][ T1661] ? fuse_lookup.part.0+0xdf/0x390 [ 721.660253][ T1661] ? d_alloc_parallel+0x938/0x1ae0 [ 721.666220][ T1661] ? fuse_lookup_name+0x630/0x630 [ 721.671363][ T1661] ? lock_downgrade+0x6d0/0x6d0 [ 721.677656][ T1661] ? __d_lookup+0x477/0x760 [ 721.682206][ T1661] ? fuse_atomic_open+0x2de/0x440 [ 721.688526][ T1661] ? fuse_lookup+0x90/0x90 [ 721.693037][ T1661] ? lookup_open.isra.0+0xc3d/0x13d0 [ 721.700049][ T1661] ? vfs_unlink+0x600/0x600 [ 721.706009][ T1661] ? path_openat+0x9af/0x27a0 [ 721.711255][ T1661] ? path_lookupat+0x830/0x830 [ 721.717451][ T1661] ? lockdep_hardirqs_on_prepare+0x420/0x420 [ 721.725690][ T1661] ? do_filp_open+0x17e/0x3c0 [ 721.730397][ T1661] ? may_open_dev+0xf0/0xf0 [ 721.736980][ T1661] ? do_raw_spin_lock+0x120/0x2b0 [ 721.742053][ T1661] ? rwlock_bug.part.0+0x90/0x90 [ 721.749836][ T1661] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.757247][ T1661] ? _raw_spin_unlock+0x24/0x40 [ 721.762121][ T1661] ? alloc_fd+0x2da/0x650 [ 721.767669][ T1661] ? do_sys_openat2+0x16d/0x420 [ 721.772555][ T1661] ? build_open_flags+0x680/0x680 [ 721.779004][ T1661] ? find_held_lock+0x2d/0x110 [ 721.783803][ T1661] ? __x64_sys_openat+0x13f/0x1f0 [ 721.790143][ T1661] ? __ia32_sys_open+0x1c0/0x1c0 [ 721.795941][ T1661] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.801867][ T1661] ? do_syscall_64+0x2d/0x70 [ 721.807718][ T1661] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.813908][ T1661] [ 721.813908][ T1661] Showing all locks held in the system: [ 721.822945][ T1661] 1 lock held by khungtaskd/1661: [ 721.830175][ T1661] #0: ffffffff8b793ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c [ 721.841191][ T1661] 1 lock held by in:imklog/8204: [ 721.846937][ T1661] #0: ffff8880141680f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.857489][ T1661] 3 locks held by syz-executor152/8538: [ 721.863084][ T1661] [ 721.866696][ T1661] ============================================= [ 721.866696][ T1661] [ 721.877137][ T1661] Kernel panic - not syncing: hung_task: blocked tasks [ 721.884007][ T1661] CPU: 1 PID: 1661 Comm: khungtaskd Not tainted 5.10.0-next-20201223-syzkaller #0 [ 721.893210][ T1661] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.903268][ T1661] Call Trace: [ 721.906553][ T1661] dump_stack+0x107/0x163 [ 721.910894][ T1661] panic+0x343/0x77f [ 721.914800][ T1661] ? __warn_printk+0xf3/0xf3 [ 721.919415][ T1661] ? watchdog.cold+0x146/0x31d [ 721.924197][ T1661] watchdog.cold+0x157/0x31d [ 721.928799][ T1661] ? trace_sched_process_hang+0x2a0/0x2a0 [ 721.934533][ T1661] kthread+0x3b1/0x4a0 [ 721.938607][ T1661] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.944535][ T1661] ret_from_fork+0x1f/0x30 [ 721.949829][ T1661] Kernel Offset: disabled [ 721.954182][ T1661] Rebooting in 86400 seconds..