INFO: task syz.3.4172:15867 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.4172      state:D stack:25160 pid:15867 tgid:15867 ppid:5809   task_flags:0x400040 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x16f3/0x4c20 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 request_wait_answer fs/fuse/dev.c:585 [inline]
 __fuse_request_send fs/fuse/dev.c:599 [inline]
 __fuse_simple_request+0x11d2/0x1bb0 fs/fuse/dev.c:693
 fuse_simple_request fs/fuse/fuse_i.h:1250 [inline]
 fuse_flush+0x5dd/0x810 fs/fuse/file.c:482
 filp_flush+0xc0/0x190 fs/open.c:1549
 filp_close+0x1d/0x40 fs/open.c:1562
 __range_close fs/file.c:767 [inline]
 __do_sys_close_range fs/file.c:826 [inline]
 __se_sys_close_range+0x35c/0x650 fs/file.c:790
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f036a42f6c9
RSP: 002b:00007ffdb5f35268 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00000000000986ee RCX: 00007f036a42f6c9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f036a687da0 R08: 0000000000000001 R09: 0000000ab5f3555f
R10: 0000001b2e220000 R11: 0000000000000246 R12: 00007f036a685fac
R13: 00007f036a685fa0 R14: ffffffffffffffff R15: 00007ffdb5f35380
 </TASK>

Showing all locks held in the system:
4 locks held by pr/legacy/17:
1 lock held by khungtaskd/38:
 #0: ffffffff8d5aa800 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8d5aa800 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #0: ffffffff8d5aa800 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/u8:5/1021:
11 locks held by kworker/u8:9/2921:
5 locks held by kworker/u8:11/4546:
2 locks held by getty/5554:
 #0: ffff88823bf320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90003e762e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1400 drivers/tty/n_tty.c:2222
2 locks held by kworker/0:5/5905:
2 locks held by syz.1.4943/17929:
5 locks held by syz.4.4955/17955:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
 watchdog+0xf60/0xfa0 kernel/hung_task.c:495
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:affine_move_task kernel/sched/core.c:2937 [inline]
RIP: 0010:__set_cpus_allowed_ptr_locked+0x895/0x1860 kernel/sched/core.c:3125
Code: e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 bb 3d 90 00 49 8b 36 48 89 df e8 50 a7 33 09 80 7c 24 10 00 <48> 8b 5c 24 08 75 45 48 8d bb e8 0b 00 00 48 89 f8 48 c1 e8 03 48
RSP: 0018:ffffc90000157860 EFLAGS: 00000002
RAX: d0485621733dfe00 RBX: ffff88801b2f6480 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffffc90000157a70 R08: ffff88801b2f6483 R09: 1ffff1100365ec90
R10: dffffc0000000000 R11: ffffed100365ec91 R12: ffff8880b883bbf0
R13: 0000000000000000 R14: ffffc90000157a90 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888126df9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c402f32 CR3: 00000000665cc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __set_cpus_allowed_ptr kernel/sched/core.c:3157 [inline]
 ___migrate_enable+0x18f/0x1e0 kernel/sched/core.c:2394
 __migrate_enable include/linux/sched.h:2368 [inline]
 migrate_enable include/linux/sched.h:2417 [inline]
 __local_bh_enable+0x2f8/0x410 kernel/softirq.c:250
 ksoftirqd_run_end kernel/softirq.c:325 [inline]
 run_ktimerd+0xf1/0x190 kernel/softirq.c:1140
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>