syzbot

INFO: task syz-executor.0:20249 blocked for more than 144 seconds.
      Not tainted 6.1.0-rc4-syzkaller-31872-g1621b6eaebf7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:0     pid:20249 ppid:3044   flags:0x00000009
Call trace:
 __switch_to+0x180/0x298 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5191 [inline]
 __schedule+0x408/0x594 kernel/sched/core.c:6503
 schedule+0x64/0xa4 kernel/sched/core.c:6579
 request_wait_answer+0x1c0/0x3a8 fs/fuse/dev.c:407
 __fuse_request_send+0x1f8/0x264 fs/fuse/dev.c:426
 fuse_simple_request+0x354/0x40c fs/fuse/dev.c:511
 fuse_send_open fs/fuse/file.c:48 [inline]
 fuse_file_open+0x1a8/0x2b8 fs/fuse/file.c:145
 fuse_do_open fs/fuse/file.c:172 [inline]
 fuse_open_common+0x120/0x230 fs/fuse/file.c:251
 fuse_open+0x2c/0x3c fs/fuse/file.c:340
 do_dentry_open+0x364/0x748 fs/open.c:882
 vfs_open+0x38/0x48 fs/open.c:1013
 do_open fs/namei.c:3557 [inline]
 path_openat+0xe34/0x11c4 fs/namei.c:3713
 do_filp_open+0xdc/0x1b8 fs/namei.c:3740
 do_sys_openat2+0xb8/0x22c fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/11:
 #0: ffff80000d3f3868 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/12:
 #0: ffff80000d3f3eb8 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/27:
 #0: ffff80000d3f3740 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:303
2 locks held by getty/2706:
 #0: ffff0000c9598098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x28/0x58 drivers/tty/tty_ldisc.c:244
 #1: ffff80000f5f62f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x19c/0x89c drivers/tty/n_tty.c:2177

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