[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.6' (ECDSA) to the list of known hosts. syzkaller login: [ 721.574518][ T1665] INFO: task syz-executor796:8516 can't die for more than 143 seconds. [ 721.582985][ T1665] task:syz-executor796 state:R running task stack:27176 pid: 8516 ppid: 8511 flags:0x00004006 [ 721.596332][ T1665] Call Trace: [ 721.599638][ T1665] ? find_held_lock+0x2d/0x110 [ 721.605735][ T1665] ? lock_release+0x710/0x710 [ 721.610446][ T1665] ? iget5_locked+0xcc/0x2d0 [ 721.616355][ T1665] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.621753][ T1665] ? find_inode+0x109/0x220 [ 721.627374][ T1665] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.632781][ T1665] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.639251][ T1665] ? iget5_locked+0x129/0x2d0 [ 721.643954][ T1665] ? fuse_inode_eq+0x80/0x80 [ 721.649704][ T1665] ? fuse_iget+0x271/0x610 [ 721.654151][ T1665] ? fuse_change_attributes+0x610/0x610 [ 721.660797][ T1665] ? fuse_simple_request+0x3e8/0xd90 [ 721.666788][ T1665] ? fuse_lookup_name+0x447/0x630 [ 721.671842][ T1665] ? fuse_create+0x30/0x30 [ 721.677417][ T1665] ? find_held_lock+0x2d/0x110 [ 721.682221][ T1665] ? mark_held_locks+0x9f/0xe0 [ 721.688103][ T1665] ? fuse_lookup.part.0+0xdf/0x390 [ 721.693240][ T1665] ? d_alloc_parallel+0x938/0x1ae0 [ 721.699440][ T1665] ? fuse_lookup_name+0x630/0x630 [ 721.705400][ T1665] ? lock_downgrade+0x6d0/0x6d0 [ 721.710293][ T1665] ? __d_lookup+0x477/0x760 [ 721.716667][ T1665] ? fuse_atomic_open+0x2de/0x440 [ 721.721718][ T1665] ? fuse_lookup+0x90/0x90 [ 721.727251][ T1665] ? lookup_open.isra.0+0xc3d/0x13d0 [ 721.732575][ T1665] ? vfs_unlink+0x600/0x600 [ 721.738241][ T1665] ? path_openat+0x9af/0x27a0 [ 721.742985][ T1665] ? path_lookupat+0x830/0x830 [ 721.748867][ T1665] ? lockdep_hardirqs_on_prepare+0x420/0x420 [ 721.755535][ T1665] ? do_filp_open+0x17e/0x3c0 [ 721.760235][ T1665] ? may_open_dev+0xf0/0xf0 [ 721.765903][ T1665] ? do_raw_spin_lock+0x120/0x2b0 [ 721.770957][ T1665] ? rwlock_bug.part.0+0x90/0x90 [ 721.776982][ T1665] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.783257][ T1665] ? _raw_spin_unlock+0x24/0x40 [ 721.789270][ T1665] ? alloc_fd+0x2da/0x650 [ 721.793634][ T1665] ? do_sys_openat2+0x16d/0x420 [ 721.799594][ T1665] ? build_open_flags+0x680/0x680 [ 721.805335][ T1665] ? find_held_lock+0x2d/0x110 [ 721.810128][ T1665] ? __x64_sys_openat+0x13f/0x1f0 [ 721.816407][ T1665] ? __ia32_sys_open+0x1c0/0x1c0 [ 721.821376][ T1665] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.829388][ T1665] ? do_syscall_64+0x2d/0x70 [ 721.833995][ T1665] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.841606][ T1665] [ 721.841606][ T1665] Showing all locks held in the system: [ 721.850237][ T1665] 1 lock held by khungtaskd/1665: [ 721.857318][ T1665] #0: ffffffff8b793ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c [ 721.867910][ T1665] 1 lock held by in:imklog/8380: [ 721.872856][ T1665] #0: ffff8880239d3c70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.883142][ T1665] 2 locks held by syz-executor796/8516: [ 721.889442][ T1665] [ 721.891819][ T1665] ============================================= [ 721.891819][ T1665] [ 721.901454][ T1665] Kernel panic - not syncing: hung_task: blocked tasks [ 721.908317][ T1665] CPU: 0 PID: 1665 Comm: khungtaskd Not tainted 5.10.0-next-20201223-syzkaller #0 [ 721.917533][ T1665] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.927591][ T1665] Call Trace: [ 721.930875][ T1665] dump_stack+0x107/0x163 [ 721.935220][ T1665] panic+0x343/0x77f [ 721.939126][ T1665] ? __warn_printk+0xf3/0xf3 [ 721.943735][ T1665] ? watchdog.cold+0x146/0x31d [ 721.948520][ T1665] watchdog.cold+0x157/0x31d [ 721.953122][ T1665] ? trace_sched_process_hang+0x2a0/0x2a0 [ 721.958864][ T1665] kthread+0x3b1/0x4a0 [ 721.962972][ T1665] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.968890][ T1665] ret_from_fork+0x1f/0x30 [ 721.973828][ T1665] Kernel Offset: disabled [ 721.978153][ T1665] Rebooting in 86400 seconds..