[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.27' (ECDSA) to the list of known hosts. syzkaller login: [ 721.442419][ T1647] INFO: task syz-executor656:8498 can't die for more than 143 seconds. [ 721.450929][ T1647] task:syz-executor656 state:R running task stack:27904 pid: 8498 ppid: 8493 flags:0x00004006 [ 721.464803][ T1647] Call Trace: [ 721.468119][ T1647] ? lock_acquire+0x29d/0x750 [ 721.473824][ T1647] ? rcu_read_lock_sched_held+0x1c/0x70 [ 721.479412][ T1647] ? lock_downgrade+0x6d0/0x6d0 [ 721.487111][ T1647] ? lock_release+0x710/0x710 [ 721.491815][ T1647] ? iget5_locked+0xcc/0x2d0 [ 721.497704][ T1647] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.503905][ T1647] ? _raw_spin_unlock+0x1a/0x40 [ 721.508801][ T1647] ? find_inode+0x109/0x220 [ 721.514504][ T1647] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.519906][ T1647] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.526807][ T1647] ? iget5_locked+0xac/0x2d0 [ 721.531428][ T1647] ? iget5_locked+0xac/0x2d0 [ 721.537280][ T1647] ? fuse_inode_eq+0x80/0x80 [ 721.541906][ T1647] ? fuse_iget+0x271/0x610 [ 721.547509][ T1647] ? fuse_change_attributes+0x610/0x610 [ 721.553872][ T1647] ? fuse_simple_request+0x3e8/0xd90 [ 721.559184][ T1647] ? fuse_lookup_name+0x447/0x630 [ 721.565418][ T1647] ? fuse_create+0x30/0x30 [ 721.569857][ T1647] ? find_held_lock+0x2d/0x110 [ 721.576079][ T1647] ? mark_held_locks+0x9f/0xe0 [ 721.580879][ T1647] ? fuse_lookup.part.0+0xdf/0x390 [ 721.587593][ T1647] ? d_alloc_parallel+0x938/0x1ae0 [ 721.593709][ T1647] ? fuse_lookup_name+0x630/0x630 [ 721.598762][ T1647] ? lock_downgrade+0x6d0/0x6d0 [ 721.604828][ T1647] ? __d_lookup+0x477/0x760 [ 721.609371][ T1647] ? fuse_atomic_open+0x2de/0x440 [ 721.616823][ T1647] ? fuse_lookup+0x90/0x90 [ 721.621266][ T1647] ? lookup_open.isra.0+0xc3d/0x13d0 [ 721.627888][ T1647] ? vfs_unlink+0x600/0x600 [ 721.633252][ T1647] ? path_openat+0x9af/0x27a0 [ 721.637974][ T1647] ? path_lookupat+0x830/0x830 [ 721.643959][ T1647] ? lockdep_hardirqs_on_prepare+0x420/0x420 [ 721.649990][ T1647] ? do_filp_open+0x17e/0x3c0 [ 721.655871][ T1647] ? may_open_dev+0xf0/0xf0 [ 721.660415][ T1647] ? do_raw_spin_lock+0x120/0x2b0 [ 721.667096][ T1647] ? rwlock_bug.part.0+0x90/0x90 [ 721.672066][ T1647] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.679415][ T1647] ? _raw_spin_unlock+0x24/0x40 [ 721.685602][ T1647] ? alloc_fd+0x2da/0x650 [ 721.689970][ T1647] ? do_sys_openat2+0x16d/0x420 [ 721.696294][ T1647] ? build_open_flags+0x680/0x680 [ 721.701355][ T1647] ? find_held_lock+0x2d/0x110 [ 721.707701][ T1647] ? __x64_sys_openat+0x13f/0x1f0 [ 721.713713][ T1647] ? __ia32_sys_open+0x1c0/0x1c0 [ 721.718683][ T1647] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.725963][ T1647] ? do_syscall_64+0x2d/0x70 [ 721.730589][ T1647] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.738114][ T1647] [ 721.738114][ T1647] Showing all locks held in the system: [ 721.747958][ T1647] 1 lock held by khungtaskd/1647: [ 721.753784][ T1647] #0: ffffffff8b78f920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c [ 721.764553][ T1647] 1 lock held by in:imklog/8185: [ 721.769613][ T1647] #0: ffff88801ad9e0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.781374][ T1647] 3 locks held by syz-executor656/8498: [ 721.787762][ T1647] [ 721.790101][ T1647] ============================================= [ 721.790101][ T1647] [ 721.799750][ T1647] Kernel panic - not syncing: hung_task: blocked tasks [ 721.806605][ T1647] CPU: 0 PID: 1647 Comm: khungtaskd Not tainted 5.10.0-next-20201215-syzkaller #0 [ 721.815805][ T1647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.825869][ T1647] Call Trace: [ 721.829154][ T1647] dump_stack+0x107/0x163 [ 721.833508][ T1647] panic+0x343/0x77f [ 721.837417][ T1647] ? __warn_printk+0xf3/0xf3 [ 721.842030][ T1647] ? watchdog.cold+0x146/0x31d [ 721.846827][ T1647] watchdog.cold+0x157/0x31d [ 721.851436][ T1647] ? trace_sched_process_hang+0x2a0/0x2a0 [ 721.857170][ T1647] kthread+0x3b1/0x4a0 [ 721.861253][ T1647] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.867162][ T1647] ret_from_fork+0x1f/0x30 [ 721.871782][ T1647] Kernel Offset: disabled [ 721.876110][ T1647] Rebooting in 86400 seconds..