INFO: task syz.1.10599:11492 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.10599     state:D stack:25224 pid:11492 tgid:11492 ppid:7249   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 request_wait_answer fs/fuse/dev.c:567 [inline]
 __fuse_request_send fs/fuse/dev.c:581 [inline]
 __fuse_simple_request+0xf15/0x18d0 fs/fuse/dev.c:675
 fuse_simple_request fs/fuse/fuse_i.h:1247 [inline]
 fuse_flush+0x5d4/0x800 fs/fuse/file.c:476
 filp_flush+0xbd/0x190 fs/open.c:1547
 filp_close+0x1d/0x40 fs/open.c:1560
 __range_close fs/file.c:767 [inline]
 __do_sys_close_range fs/file.c:826 [inline]
 __se_sys_close_range+0x359/0x650 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: 0033:0x7f4c82d8ebe9
RSP: 002b:00007ffeea099958 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f4c82fb7da0 RCX: 00007f4c82d8ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f4c82fb7da0 R08: 0000000000000120 R09: 00000012ea099c4f
R10: 00000000003ffcbc R11: 0000000000000246 R12: 0000000000181b42
R13: 00007f4c82fb6090 R14: ffffffffffffffff R15: 00007ffeea099a70
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+0x47c/0x820 arch/x86/kernel/process.c:148
 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: 6489 Comm: kworker/u8:11 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:slab_free_hook mm/slub.c:2340 [inline]
RIP: 0010:slab_free mm/slub.c:4680 [inline]
RIP: 0010:kmem_cache_free+0x178/0x400 mm/slub.c:4782
Code: 74 1f 48 8b 3d d1 74 d2 0b ba 18 00 00 00 be 00 28 00 00 e8 3a f6 ff ff 48 85 c0 0f 85 7c 01 00 00 45 84 ed 0f 85 d1 00 00 00 <c1> ed 09 83 e5 01 41 0f b6 d5 4c 89 f7 48 89 de 89 e9 e8 c1 91 0a
RSP: 0018:ffffc9000447f920 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88808c0c9140 RCX: 0000000000000dc0
RDX: 0000000000000002 RSI: ffff88808c0c9140 RDI: 1ffff11011819228
RBP: 0000000000212110 R08: ffffffff8fe52d37 R09: 1ffffffff1fca5a6
R10: dffffc0000000000 R11: fffffbfff1fca5a7 R12: ffffea0002303240
R13: 0000000000000000 R14: ffff88801eebf8c0 R15: ffffffff872280ff
FS:  0000000000000000(0000) GS:ffff8881257c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ce7b5e1008 CR3: 000000000e338000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:836 [inline]
 nsim_dev_trap_report_work+0x7cf/0xb80 drivers/net/netdevsim/dev.c:866
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>