[  OK  ] Reached target Multi-User System.
[  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...

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts.
syzkaller login: [  721.404291][ T1663] INFO: task syz-executor963:8507 can't die for more than 143 seconds.
[  721.412865][ T1663] task:syz-executor963 state:R  running task     stack:26488 pid: 8507 ppid:  8502 flags:0x00004006
[  721.426823][ T1663] Call Trace:
[  721.430182][ T1663]  ? find_held_lock+0x2d/0x110
[  721.436637][ T1663]  ? lock_release+0x5b7/0x710
[  721.441374][ T1663]  ? lock_release+0x710/0x710
[  721.447554][ T1663]  ? rwlock_bug.part.0+0x90/0x90
[  721.452542][ T1663]  ? iget5_locked+0xcc/0x2d0
[  721.458908][ T1663]  ? _raw_spin_lock+0x2a/0x40
[  721.465716][ T1663]  ? _raw_spin_unlock+0x12/0x40
[  721.470610][ T1663]  ? find_inode+0xc1/0x220
[  721.476914][ T1663]  ? _atomic_dec_and_lock+0x92/0x100
[  721.482359][ T1663]  ? fuse_init_file_inode+0x1e0/0x1e0
[  721.489450][ T1663]  ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70
[  721.496794][ T1663]  ? iget5_locked+0xcc/0x2d0
[  721.501426][ T1663]  ? fuse_inode_eq+0x80/0x80
[  721.507396][ T1663]  ? fuse_iget+0x271/0x610
[  721.511853][ T1663]  ? fuse_change_attributes+0x610/0x610
[  721.518937][ T1663]  ? fuse_simple_request+0x3e8/0xd10
[  721.525242][ T1663]  ? fuse_lookup_name+0x447/0x630
[  721.530318][ T1663]  ? fuse_create+0x30/0x30
[  721.536441][ T1663]  ? find_held_lock+0x2d/0x110
[  721.541287][ T1663]  ? fuse_lookup.part.0+0xdf/0x390
[  721.547880][ T1663]  ? fuse_lookup_name+0x630/0x630
[  721.552983][ T1663]  ? lockdep_init_map_waits+0x26a/0x720
[  721.559966][ T1663]  ? fuse_lookup+0x70/0x90
[  721.565745][ T1663]  ? __lookup_slow+0x24c/0x480
[  721.570615][ T1663]  ? page_put_link+0x210/0x210
[  721.576966][ T1663]  ? inode_permission.part.0+0xab/0x410
[  721.582551][ T1663]  ? walk_component+0x418/0x6a0
[  721.588970][ T1663]  ? handle_dots.part.0+0x1520/0x1520
[  721.595486][ T1663]  ? walk_component+0x6a0/0x6a0
[  721.600393][ T1663]  ? path_lookupat+0x1ba/0x830
[  721.606771][ T1663]  ? filename_lookup+0x19f/0x560
[  721.611776][ T1663]  ? may_linkat+0x2b0/0x2b0
[  721.618140][ T1663]  ? memcpy+0x39/0x60
[  721.622306][ T1663]  ? getname_kernel+0x21e/0x370
[  721.628596][ T1663]  ? unix_find_other+0xd1/0x6f0
[  721.633546][ T1663]  ? unix_stream_recvmsg+0xf0/0xf0
[  721.640333][ T1663]  ? unix_dgram_sendmsg+0xc73/0x1a80
[  721.646664][ T1663]  ? unix_stream_sendpage+0xcb0/0xcb0
[  721.652076][ T1663]  ? aa_af_perm+0x230/0x230
[  721.658154][ T1663]  ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70
[  721.665362][ T1663]  ? unix_stream_sendpage+0xcb0/0xcb0
[  721.670773][ T1663]  ? sock_sendmsg+0xcf/0x120
[  721.677052][ T1663]  ? ____sys_sendmsg+0x331/0x810
[  721.682028][ T1663]  ? kernel_sendmsg+0x50/0x50
[  721.688122][ T1663]  ? do_recvmmsg+0x6c0/0x6c0
[  721.692786][ T1663]  ? __lock_acquire+0x16c2/0x54f0
[  721.699326][ T1663]  ? ___sys_sendmsg+0xf3/0x170
[  721.705036][ T1663]  ? sendmsg_copy_msghdr+0x160/0x160
[  721.710379][ T1663]  ? find_held_lock+0x2d/0x110
[  721.716707][ T1663]  ? 0xffffffff81000000
[  721.720918][ T1663]  ? __sys_sendmmsg+0x195/0x470
[  721.727725][ T1663]  ? __ia32_sys_sendmsg+0xb0/0xb0
[  721.732801][ T1663]  ? lock_downgrade+0x6d0/0x6d0
[  721.739302][ T1663]  ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70
[  721.746718][ T1663]  ? fd_install+0x215/0x640
[  721.751263][ T1663]  ? __do_sys_futex+0x2a2/0x470
[  721.757626][ T1663]  ? __do_sys_futex+0x2ab/0x470
[  721.762531][ T1663]  ? __x64_sys_sendmmsg+0x99/0x100
[  721.769259][ T1663]  ? syscall_enter_from_user_mode+0x1d/0x50
[  721.776274][ T1663]  ? do_syscall_64+0x2d/0x70
[  721.780967][ T1663]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  721.789049][ T1663] 
[  721.789049][ T1663] Showing all locks held in the system:
[  721.797794][ T1663] 1 lock held by khungtaskd/1663:
[  721.802867][ T1663]  #0: ffffffff8b373ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260
[  721.816011][ T1663] 1 lock held by in:imklog/8193:
[  721.820978][ T1663]  #0: ffff888013c30870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100
[  721.831700][ T1663] 3 locks held by syz-executor963/8507:
[  721.838223][ T1663] 
[  721.840565][ T1663] =============================================
[  721.840565][ T1663] 
[  721.850523][ T1663] Kernel panic - not syncing: hung_task: blocked tasks
[  721.857462][ T1663] CPU: 0 PID: 1663 Comm: khungtaskd Not tainted 5.11.0-rc2-next-20210111-syzkaller #0
[  721.867023][ T1663] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  721.877103][ T1663] Call Trace:
[  721.880408][ T1663]  dump_stack+0x107/0x163
[  721.884873][ T1663]  panic+0x306/0x73d
[  721.888829][ T1663]  ? __warn_printk+0xf3/0xf3
[  721.893447][ T1663]  ? watchdog.cold+0x22d/0x248
[  721.898281][ T1663]  watchdog.cold+0x23e/0x248
[  721.902925][ T1663]  ? trace_sched_process_hang+0x280/0x280
[  721.908679][ T1663]  kthread+0x3b1/0x4a0
[  721.912842][ T1663]  ? kthread_create_worker_on_cpu+0xf0/0xf0
[  721.918895][ T1663]  ret_from_fork+0x1f/0x30
[  721.924063][ T1663] Kernel Offset: disabled
[  721.928408][ T1663] Rebooting in 86400 seconds..