INFO: task syz.0.647:6787 blocked for more than 145 seconds.
      Not tainted 5.15.178-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.647       state:D stack:27064 pid: 6787 ppid:  4173 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 request_wait_answer fs/fuse/dev.c:411 [inline]
 __fuse_request_send fs/fuse/dev.c:430 [inline]
 fuse_simple_request+0x112f/0x1a00 fs/fuse/dev.c:515
 fuse_flush+0x5d2/0x800 fs/fuse/file.c:517
 filp_close+0xad/0x150 fs/open.c:1363
 __range_close fs/file.c:694 [inline]
 __close_range+0x229/0x570 fs/file.c:749
 __do_sys_close_range fs/open.c:1408 [inline]
 __se_sys_close_range fs/open.c:1405 [inline]
 __x64_sys_close_range+0x76/0x80 fs/open.c:1405
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbf81c98169
RSP: 002b:00007fff57d03c18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fbf81eb2ba0 RCX: 00007fbf81c98169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fbf81eb2ba0 R08: 0000000000000080 R09: 0000000857d03f0f
R10: 00007fbf81eb2ac0 R11: 0000000000000246 R12: 000000000004f164
R13: 00007fff57d03d10 R14: ffffffffffffffff R15: 00007fff57d03d30
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3925:
 #0: ffff88802cbba098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900025ae2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
1 lock held by syz.4.1058/8315:
1 lock held by syz.1.1059/8306:
3 locks held by syz.3.1061/8312:

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xe72/0xeb0 kernel/hung_task.c:295
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8311 Comm: syz.3.1061 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0033:0x7f28639c41a2
Code: 33 00 00 49 89 d6 48 89 d5 74 28 25 ff 0f 00 00 83 f0 3d 8d 04 c0 89 c5 c1 ed 04 31 c5 69 ed 2d eb d4 27 89 e8 c1 e8 0f 31 c5 <81> e5 ff 0f 00 00 48 31 d5 80 3d 96 4e 33 00 00 0f 84 a8 00 00 00
RSP: 002b:00007fffe3aab200 EFLAGS: 00000286
RAX: 0000000000014515 RBX: 00007f286482c720 RCX: 00000000000146a6
RDX: ffffffff81a898b8 RSI: ffffffff81a89c6f RDI: 0000000000000009
RBP: 00000000a28badd2 R08: 00007f2863cfd038 R09: 00007f2863ce9000
R10: 00007f2863156008 R11: 0000000000000009 R12: 0000000000000009
R13: 0000000000000000 R14: ffffffff81a898b8 R15: 00000000000146a6
FS:  0000555583942500 GS:  0000000000000000