[ 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 '10.128.10.18' (ECDSA) to the list of known hosts. syzkaller login: [ 721.346246][ T1648] INFO: task syz-executor848:8490 can't die for more than 143 seconds. [ 721.354732][ T1648] task:syz-executor848 state:R running task stack:28240 pid: 8490 ppid: 8485 flags:0x00004006 [ 721.368319][ T1648] Call Trace: [ 721.371622][ T1648] ? lock_acquire+0x29d/0x740 [ 721.377634][ T1648] ? find_inode+0x109/0x220 [ 721.382227][ T1648] ? lock_release+0x710/0x710 [ 721.388201][ T1648] ? ilookup5_nowait+0x7e/0xb0 [ 721.392990][ T1648] ? lock_downgrade+0x6d0/0x6d0 [ 721.399585][ T1648] ? _raw_spin_lock+0x2a/0x40 [ 721.404404][ T1648] ? _raw_spin_unlock+0x24/0x40 [ 721.410638][ T1648] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.416994][ T1648] ? _raw_spin_lock+0x2a/0x40 [ 721.421700][ T1648] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.428441][ T1648] ? ilookup5_nowait+0x7e/0xb0 [ 721.433234][ T1648] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.440616][ T1648] ? iget5_locked+0x41/0x220 [ 721.445340][ T1648] ? fuse_iget+0x271/0x610 [ 721.453467][ T1648] ? fuse_change_attributes+0x610/0x610 [ 721.460006][ T1648] ? fuse_readdir_uncached+0x11e0/0x1730 [ 721.465772][ T1648] ? fuse_emit+0xbe0/0xbe0 [ 721.471503][ T1648] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 721.478411][ T1648] ? __mutex_lock+0x61b/0x1110 [ 721.483227][ T1648] ? lock_release+0x710/0x710 [ 721.489179][ T1648] ? fuse_readdir+0x871/0x1830 [ 721.493969][ T1648] ? down_read_killable+0x1a4/0x480 [ 721.500466][ T1648] ? down_read+0x440/0x440 [ 721.504911][ T1648] ? security_file_permission+0x304/0x560 [ 721.511992][ T1648] ? iterate_dir+0x4eb/0x660 [ 721.517519][ T1648] ? __x64_sys_getdents+0x13a/0x2b0 [ 721.522746][ T1648] ? __do_sys_futex+0x2ab/0x470 [ 721.529068][ T1648] ? __ia32_sys_old_readdir+0x1c0/0x1c0 [ 721.534643][ T1648] ? filldir64+0x6a0/0x6a0 [ 721.540482][ T1648] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.547341][ T1648] ? do_syscall_64+0x2d/0x70 [ 721.551953][ T1648] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.559727][ T1648] [ 721.559727][ T1648] Showing all locks held in the system: [ 721.568816][ T1648] 1 lock held by khungtaskd/1648: [ 721.573856][ T1648] #0: ffffffff8b363660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.586618][ T1648] 1 lock held by in:imklog/8177: [ 721.591573][ T1648] #0: ffff888020b32ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.602747][ T1648] 4 locks held by syz-executor848/8490: [ 721.609225][ T1648] [ 721.611562][ T1648] ============================================= [ 721.611562][ T1648] [ 721.621487][ T1648] Kernel panic - not syncing: hung_task: blocked tasks [ 721.628345][ T1648] CPU: 0 PID: 1648 Comm: khungtaskd Not tainted 5.10.0-next-20201223-syzkaller #0 [ 721.637544][ T1648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.647602][ T1648] Call Trace: [ 721.650883][ T1648] dump_stack+0x107/0x163 [ 721.655278][ T1648] panic+0x306/0x73d [ 721.659204][ T1648] ? __warn_printk+0xf3/0xf3 [ 721.663817][ T1648] ? watchdog.cold+0x22d/0x248 [ 721.668630][ T1648] watchdog.cold+0x23e/0x248 [ 721.673246][ T1648] ? trace_sched_process_hang+0x280/0x280 [ 721.679065][ T1648] kthread+0x3b1/0x4a0 [ 721.683206][ T1648] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.689112][ T1648] ret_from_fork+0x1f/0x30 [ 721.694279][ T1648] Kernel Offset: disabled [ 721.698605][ T1648] Rebooting in 86400 seconds..