[ 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 '10.128.15.210' (ECDSA) to the list of known hosts. syzkaller login: [ 721.423460][ T1663] INFO: task syz-executor556:8473 can't die for more than 143 seconds. [ 721.432078][ T1663] task:syz-executor556 state:R running task stack:26488 pid: 8473 ppid: 8468 flags:0x00004006 [ 721.446532][ T1663] Call Trace: [ 721.449915][ T1663] ? find_held_lock+0x2d/0x110 [ 721.456374][ T1663] ? find_inode+0x1b8/0x220 [ 721.460938][ T1663] ? iget5_locked+0xcc/0x2d0 [ 721.467135][ T1663] ? _raw_spin_lock+0x2a/0x40 [ 721.471909][ T1663] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.479291][ T1663] ? fuse_init_file_inode+0x1e0/0x1e0 [ 721.485766][ T1663] ? iput.part.0+0x67/0x810 [ 721.490297][ T1663] ? iget5_locked+0xbd/0x2d0 [ 721.496312][ T1663] ? fuse_inode_eq+0x80/0x80 [ 721.500940][ T1663] ? fuse_iget+0x271/0x610 [ 721.506842][ T1663] ? fuse_change_attributes+0x610/0x610 [ 721.512459][ T1663] ? fuse_simple_request+0x3e8/0xd10 [ 721.519294][ T1663] ? fuse_lookup_name+0x447/0x630 [ 721.525250][ T1663] ? fuse_create+0x30/0x30 [ 721.529705][ T1663] ? find_held_lock+0x2d/0x110 [ 721.535934][ T1663] ? fuse_lookup.part.0+0xdf/0x390 [ 721.541081][ T1663] ? fuse_lookup_name+0x630/0x630 [ 721.547560][ T1663] ? lockdep_init_map_waits+0x26a/0x720 [ 721.554341][ T1663] ? fuse_lookup+0x70/0x90 [ 721.558802][ T1663] ? __lookup_slow+0x24c/0x480 [ 721.565348][ T1663] ? page_put_link+0x210/0x210 [ 721.570213][ T1663] ? inode_permission.part.0+0xab/0x410 [ 721.577379][ T1663] ? walk_component+0x418/0x6a0 [ 721.582295][ T1663] ? handle_dots.part.0+0x1520/0x1520 [ 721.589607][ T1663] ? walk_component+0x6a0/0x6a0 [ 721.595671][ T1663] ? path_lookupat+0x1ba/0x830 [ 721.600481][ T1663] ? filename_lookup+0x19f/0x560 [ 721.607087][ T1663] ? may_linkat+0x2b0/0x2b0 [ 721.611657][ T1663] ? memcpy+0x39/0x60 [ 721.617573][ T1663] ? getname_kernel+0x21e/0x370 [ 721.622558][ T1663] ? unix_find_other+0xd1/0x6f0 [ 721.628973][ T1663] ? unix_stream_recvmsg+0xf0/0xf0 [ 721.635167][ T1663] ? unix_dgram_sendmsg+0xc73/0x1a80 [ 721.640522][ T1663] ? unix_stream_sendpage+0xcb0/0xcb0 [ 721.647212][ T1663] ? aa_af_perm+0x230/0x230 [ 721.651900][ T1663] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.659970][ T1663] ? unix_stream_sendpage+0xcb0/0xcb0 [ 721.666365][ T1663] ? sock_sendmsg+0xcf/0x120 [ 721.671052][ T1663] ? ____sys_sendmsg+0x331/0x810 [ 721.677400][ T1663] ? kernel_sendmsg+0x50/0x50 [ 721.682136][ T1663] ? do_recvmmsg+0x6c0/0x6c0 [ 721.688048][ T1663] ? __lock_acquire+0x16c2/0x54f0 [ 721.693115][ T1663] ? ___sys_sendmsg+0xf3/0x170 [ 721.699546][ T1663] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.705758][ T1663] ? find_held_lock+0x2d/0x110 [ 721.710925][ T1663] ? 0xffffffff81000000 [ 721.716533][ T1663] ? __sys_sendmmsg+0x195/0x470 [ 721.721424][ T1663] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.728107][ T1663] ? lock_downgrade+0x6d0/0x6d0 [ 721.733011][ T1663] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.740838][ T1663] ? fd_install+0x215/0x640 [ 721.746491][ T1663] ? __do_sys_futex+0x2a2/0x470 [ 721.751485][ T1663] ? __do_sys_futex+0x2ab/0x470 [ 721.757952][ T1663] ? __x64_sys_sendmmsg+0x99/0x100 [ 721.763113][ T1663] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.770583][ T1663] ? do_syscall_64+0x2d/0x70 [ 721.776595][ T1663] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.782829][ T1663] [ 721.782829][ T1663] Showing all locks held in the system: [ 721.792223][ T1663] 1 lock held by khungtaskd/1663: [ 721.798545][ T1663] #0: ffffffff8b370ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.809770][ T1663] 1 lock held by in:imklog/8317: [ 721.815671][ T1663] #0: ffff888022b48370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.825948][ T1663] 3 locks held by syz-executor556/8473: [ 721.831544][ T1663] [ 721.836943][ T1663] ============================================= [ 721.836943][ T1663] [ 721.846557][ T1663] Kernel panic - not syncing: hung_task: blocked tasks [ 721.853507][ T1663] CPU: 0 PID: 1663 Comm: khungtaskd Not tainted 5.11.0-rc3-next-20210115-syzkaller #0 [ 721.863072][ T1663] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.873148][ T1663] Call Trace: [ 721.876462][ T1663] dump_stack+0x107/0x163 [ 721.881000][ T1663] panic+0x306/0x73d [ 721.885960][ T1663] ? __warn_printk+0xf3/0xf3 [ 721.890596][ T1663] ? watchdog.cold+0x22d/0x248 [ 721.895440][ T1663] watchdog.cold+0x23e/0x248 [ 721.900152][ T1663] ? trace_sched_process_hang+0x280/0x280 [ 721.905922][ T1663] kthread+0x3b1/0x4a0 [ 721.910117][ T1663] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.916131][ T1663] ret_from_fork+0x1f/0x30 [ 721.921449][ T1663] Kernel Offset: disabled [ 721.925919][ T1663] Rebooting in 86400 seconds..