[ 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 '10.128.0.90' (ECDSA) to the list of known hosts. syzkaller login: [ 721.460712][ T1665] INFO: task syz-executor628:8442 can't die for more than 143 seconds. [ 721.469141][ T1665] task:syz-executor628 state:R running task stack:25824 pid: 8442 ppid: 8437 flags:0x00004006 [ 721.482918][ T1665] Call Trace: [ 721.486247][ T1665] ? lock_acquire+0x1a8/0x720 [ 721.492428][ T1665] ? find_held_lock+0x2d/0x110 [ 721.497232][ T1665] ? iget5_locked+0xac/0x2d0 [ 721.503195][ T1665] ? lock_release+0x710/0x710 [ 721.507902][ T1665] ? iget5_locked+0xcc/0x2d0 [ 721.513800][ T1665] ? lock_downgrade+0x6d0/0x6d0 [ 721.518685][ T1665] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.525551][ T1665] ? find_inode+0x109/0x220 [ 721.530091][ T1665] ? ___might_sleep+0x202/0x2c0 [ 721.536390][ T1665] ? iget5_locked+0xac/0x2d0 [ 721.541827][ T1665] ? fuse_inode_eq+0x80/0x80 [ 721.546451][ T1665] ? fuse_iget+0x24e/0x610 [ 721.552234][ T1665] ? fuse_change_attributes+0x610/0x610 [ 721.557816][ T1665] ? fuse_simple_request+0x3e8/0xd10 [ 721.564416][ T1665] ? fuse_lookup_name+0x447/0x630 [ 721.569476][ T1665] ? fuse_create+0x30/0x30 [ 721.575575][ T1665] ? find_held_lock+0x2d/0x110 [ 721.580400][ T1665] ? fuse_lookup.part.0+0xdf/0x390 [ 721.587070][ T1665] ? fuse_lookup_name+0x630/0x630 [ 721.593032][ T1665] ? lockdep_init_map_waits+0x26a/0x720 [ 721.598626][ T1665] ? fuse_lookup+0x70/0x90 [ 721.604389][ T1665] ? __lookup_slow+0x24c/0x480 [ 721.609275][ T1665] ? page_put_link+0x210/0x210 [ 721.615634][ T1665] ? inode_permission.part.0+0xab/0x410 [ 721.622050][ T1665] ? walk_component+0x418/0x6a0 [ 721.626944][ T1665] ? handle_dots.part.0+0x1520/0x1520 [ 721.633678][ T1665] ? walk_component+0x6a0/0x6a0 [ 721.638576][ T1665] ? path_lookupat+0x1ba/0x830 [ 721.644820][ T1665] ? filename_lookup+0x19f/0x560 [ 721.649967][ T1665] ? may_linkat+0x2b0/0x2b0 [ 721.656005][ T1665] ? memcpy+0x39/0x60 [ 721.660078][ T1665] ? getname_kernel+0x21e/0x370 [ 721.666392][ T1665] ? unix_find_other+0xd1/0x6f0 [ 721.672258][ T1665] ? unix_stream_recvmsg+0xf0/0xf0 [ 721.677506][ T1665] ? unix_dgram_sendmsg+0xc73/0x1a80 [ 721.684160][ T1665] ? unix_stream_sendpage+0xcb0/0xcb0 [ 721.691508][ T1665] ? aa_af_perm+0x230/0x230 [ 721.696127][ T1665] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.703709][ T1665] ? unix_stream_sendpage+0xcb0/0xcb0 [ 721.709121][ T1665] ? sock_sendmsg+0xcf/0x120 [ 721.715144][ T1665] ? ____sys_sendmsg+0x331/0x810 [ 721.720114][ T1665] ? kernel_sendmsg+0x50/0x50 [ 721.726034][ T1665] ? do_recvmmsg+0x6c0/0x6c0 [ 721.731574][ T1665] ? __lock_acquire+0x16c2/0x54f0 [ 721.736643][ T1665] ? ___sys_sendmsg+0xf3/0x170 [ 721.743021][ T1665] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.748365][ T1665] ? find_held_lock+0x2d/0x110 [ 721.754519][ T1665] ? 0xffffffff81000000 [ 721.758733][ T1665] ? __sys_sendmmsg+0x195/0x470 [ 721.764976][ T1665] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.770042][ T1665] ? lock_downgrade+0x6d0/0x6d0 [ 721.776299][ T1665] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.783401][ T1665] ? fd_install+0x215/0x640 [ 721.787940][ T1665] ? __do_sys_futex+0x2a2/0x470 [ 721.794243][ T1665] ? __do_sys_futex+0x2ab/0x470 [ 721.799158][ T1665] ? __x64_sys_sendmmsg+0x99/0x100 [ 721.805867][ T1665] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.812705][ T1665] ? do_syscall_64+0x2d/0x70 [ 721.817323][ T1665] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.824859][ T1665] [ 721.824859][ T1665] Showing all locks held in the system: [ 721.833504][ T1665] 1 lock held by khungtaskd/1665: [ 721.838544][ T1665] #0: ffffffff8b370ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.849798][ T1665] 1 lock held by in:imklog/8318: [ 721.856352][ T1665] #0: ffff888023944af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.867563][ T1665] 2 locks held by syz-executor628/8442: [ 721.874065][ T1665] [ 721.876413][ T1665] ============================================= [ 721.876413][ T1665] [ 721.886579][ T1665] Kernel panic - not syncing: hung_task: blocked tasks [ 721.893497][ T1665] CPU: 1 PID: 1665 Comm: khungtaskd Not tainted 5.11.0-rc3-next-20210115-syzkaller #0 [ 721.903055][ T1665] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.913125][ T1665] Call Trace: [ 721.916414][ T1665] dump_stack+0x107/0x163 [ 721.920834][ T1665] panic+0x306/0x73d [ 721.924758][ T1665] ? __warn_printk+0xf3/0xf3 [ 721.929382][ T1665] ? watchdog.cold+0x22d/0x248 [ 721.934233][ T1665] watchdog.cold+0x23e/0x248 [ 721.938846][ T1665] ? trace_sched_process_hang+0x280/0x280 [ 721.944603][ T1665] kthread+0x3b1/0x4a0 [ 721.948772][ T1665] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.954695][ T1665] ret_from_fork+0x1f/0x30 [ 721.959894][ T1665] Kernel Offset: disabled [ 721.964302][ T1665] Rebooting in 86400 seconds..