INFO: task syz.3.185:5621 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.185       state:D stack:0     pid:5621  tgid:5618  ppid:4701   task_flags:0x400140 flags:0x00000011
Call trace:
 __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:810 (T)
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1c04/0x2db8 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0x13c/0x20c kernel/sched/core.c:7283
 request_wait_answer fs/fuse/dev.c:590 [inline]
 __fuse_request_send fs/fuse/dev.c:604 [inline]
 __fuse_simple_request+0xac4/0x12f4 fs/fuse/dev.c:699
 fuse_simple_request fs/fuse/fuse_i.h:1262 [inline]
 fuse_lookup_name+0x214/0x660 fs/fuse/dir.c:578
 fuse_lookup+0x198/0x354 fs/fuse/dir.c:625
 lookup_one_qstr_excl+0xe8/0x200 fs/namei.c:1805
 __start_dirop+0xb8/0xf4 fs/namei.c:2916
 start_dirop fs/namei.c:2938 [inline]
 filename_create+0x194/0x2b0 fs/namei.c:4950
 filename_mkdirat+0xbc/0x3f4 fs/namei.c:5297
 __do_sys_mkdirat fs/namei.c:5325 [inline]
 __se_sys_mkdirat fs/namei.c:5322 [inline]
 __arm64_sys_mkdirat+0x94/0xb8 fs/namei.c:5322
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffff800088bf70c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffff800088bf70c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffff800088bf70c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:3/40:
2 locks held by pr/ttyAMA-1/41:
2 locks held by getty/4486:
 #0: ffff0000d3c820a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff8000923ab2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf70 drivers/tty/n_tty.c:2211
3 locks held by syz.3.185/5621:
 #0: ffff0000c9864410 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:493
 #1: ffff0000dc95be00 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1074 [inline]
 #1: ffff0000dc95be00 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: __start_dirop+0xa0/0xf4 fs/namei.c:2914
 #2: ffff0000dc95c278 (&fi->mutex){+.+.}-{4:4}, at: fuse_lock_inode+0xd4/0x11c fs/fuse/inode.c:607

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