[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. syzkaller login: [ 721.358702][ T1659] INFO: task syz-executor660:8497 can't die for more than 143 seconds. [ 721.367171][ T1659] task:syz-executor660 state:R running task stack:25752 pid: 8497 ppid: 8492 flags:0x00004006 [ 721.381576][ T1659] Call Trace: [ 721.384939][ T1659] ? find_inode+0x1b8/0x220 [ 721.391015][ T1659] ? lock_release+0x710/0x710 [ 721.395738][ T1659] ? ilookup5_nowait+0x7e/0xb0 [ 721.401727][ T1659] ? lock_downgrade+0x6d0/0x6d0 [ 721.406638][ T1659] ? do_raw_spin_unlock+0x171/0x230 [ 721.413216][ T1659] ? _raw_spin_unlock+0x12/0x40 [ 721.418151][ T1659] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.425688][ T1659] ? find_inode+0x109/0x220 [ 721.431068][ T1659] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.436517][ T1659] ? ilookup5_nowait+0x5e/0xb0 [ 721.442508][ T1659] ? ilookup5_nowait+0x7e/0xb0 [ 721.447300][ T1659] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.453949][ T1659] ? iget5_locked+0x41/0x220 [ 721.459367][ T1659] ? fuse_inode_eq+0x80/0x80 [ 721.464009][ T1659] ? fuse_iget+0x271/0x610 [ 721.469780][ T1659] ? fuse_change_attributes+0x610/0x610 [ 721.475379][ T1659] ? fuse_simple_request+0x3e8/0xd10 [ 721.481911][ T1659] ? fuse_lookup_name+0x447/0x630 [ 721.486968][ T1659] ? fuse_create+0x30/0x30 [ 721.492885][ T1659] ? find_held_lock+0x2d/0x110 [ 721.497708][ T1659] ? fuse_lookup.part.0+0xdf/0x390 [ 721.504041][ T1659] ? fuse_lookup_name+0x630/0x630 [ 721.511277][ T1659] ? lockdep_init_map_waits+0x26a/0x720 [ 721.516868][ T1659] ? fuse_lookup+0x70/0x90 [ 721.522898][ T1659] ? __lookup_slow+0x24c/0x480 [ 721.527736][ T1659] ? page_put_link+0x210/0x210 [ 721.533869][ T1659] ? inode_permission.part.0+0xab/0x410 [ 721.540269][ T1659] ? walk_component+0x418/0x6a0 [ 721.545154][ T1659] ? handle_dots.part.0+0x1520/0x1520 [ 721.551798][ T1659] ? walk_component+0x6a0/0x6a0 [ 721.556685][ T1659] ? path_lookupat+0x1ba/0x830 [ 721.562777][ T1659] ? filename_lookup+0x19f/0x560 [ 721.567740][ T1659] ? may_linkat+0x2b0/0x2b0 [ 721.573696][ T1659] ? memcpy+0x39/0x60 [ 721.577772][ T1659] ? getname_kernel+0x21e/0x370 [ 721.583869][ T1659] ? unix_find_other+0xd1/0x6f0 [ 721.589717][ T1659] ? unix_stream_recvmsg+0xf0/0xf0 [ 721.594871][ T1659] ? unix_dgram_sendmsg+0xc73/0x1a80 [ 721.601630][ T1659] ? unix_stream_sendpage+0xcb0/0xcb0 [ 721.607028][ T1659] ? aa_af_perm+0x230/0x230 [ 721.612868][ T1659] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.619934][ T1659] ? unix_stream_sendpage+0xcb0/0xcb0 [ 721.625336][ T1659] ? sock_sendmsg+0xcf/0x120 [ 721.631425][ T1659] ? ____sys_sendmsg+0x331/0x810 [ 721.636396][ T1659] ? kernel_sendmsg+0x50/0x50 [ 721.643714][ T1659] ? do_recvmmsg+0x6c0/0x6c0 [ 721.648334][ T1659] ? __lock_acquire+0x16b7/0x5500 [ 721.654768][ T1659] ? ___sys_sendmsg+0xf3/0x170 [ 721.660434][ T1659] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.665762][ T1659] ? find_held_lock+0x2d/0x110 [ 721.671871][ T1659] ? 0xffffffff81000000 [ 721.676069][ T1659] ? __sys_sendmmsg+0x195/0x470 [ 721.682182][ T1659] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.687255][ T1659] ? lock_downgrade+0x6d0/0x6d0 [ 721.693442][ T1659] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.700571][ T1659] ? fd_install+0x215/0x640 [ 721.705172][ T1659] ? __do_sys_futex+0x2a2/0x470 [ 721.711497][ T1659] ? __do_sys_futex+0x2ab/0x470 [ 721.716395][ T1659] ? __x64_sys_sendmmsg+0x99/0x100 [ 721.722736][ T1659] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.729535][ T1659] ? do_syscall_64+0x2d/0x70 [ 721.734151][ T1659] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.741866][ T1659] [ 721.741866][ T1659] Showing all locks held in the system: [ 721.750441][ T1659] 1 lock held by khungtaskd/1659: [ 721.755478][ T1659] #0: ffffffff8b363660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.766717][ T1659] 1 lock held by in:imklog/8173: [ 721.775322][ T1659] #0: ffff88801cee3270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.785423][ T1659] 3 locks held by syz-executor660/8497: [ 721.791853][ T1659] [ 721.794192][ T1659] ============================================= [ 721.794192][ T1659] [ 721.804380][ T1659] Kernel panic - not syncing: hung_task: blocked tasks [ 721.811268][ T1659] CPU: 1 PID: 1659 Comm: khungtaskd Not tainted 5.10.0-next-20201223-syzkaller #0 [ 721.820487][ T1659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.830554][ T1659] Call Trace: [ 721.833842][ T1659] dump_stack+0x107/0x163 [ 721.838267][ T1659] panic+0x306/0x73d [ 721.842240][ T1659] ? __warn_printk+0xf3/0xf3 [ 721.846857][ T1659] ? watchdog.cold+0x22d/0x248 [ 721.851652][ T1659] watchdog.cold+0x23e/0x248 [ 721.856251][ T1659] ? trace_sched_process_hang+0x280/0x280 [ 721.861983][ T1659] kthread+0x3b1/0x4a0 [ 721.866119][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.872020][ T1659] ret_from_fork+0x1f/0x30 [ 721.877111][ T1659] Kernel Offset: disabled [ 721.881439][ T1659] Rebooting in 86400 seconds..