INFO: task syz.0.139:643 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.139       state:D stack:0     pid:643   tgid:643   ppid:296    flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6068 [inline]
 __schedule+0x16fe/0x23d0 kernel/sched/core.c:7888
 __schedule_loop kernel/sched/core.c:7965 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7980
 request_wait_answer fs/fuse/dev.c:480 [inline]
 __fuse_request_send fs/fuse/dev.c:498 [inline]
 __fuse_simple_request+0xdfb/0x1b10 fs/fuse/dev.c:593
 fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
 fuse_flush+0xa92/0x1f20 fs/fuse/file.c:602
 filp_flush fs/open.c:1546 [inline]
 filp_close+0xbd/0x160 fs/open.c:1559
 __range_close fs/file.c:726 [inline]
 __close_range+0x344/0x4e0 fs/file.c:796
 __do_sys_close_range fs/open.c:1612 [inline]
 __se_sys_close_range fs/open.c:1609 [inline]
 __x64_sys_close_range+0x7e/0x90 fs/open.c:1609
 x64_sys_call+0x1686/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:437
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f462139f559
RSP: 002b:00007fff20dcd6f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fff20dcd7e0 RCX: 00007f462139f559
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000008278 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2e220000 R11: 0000000000000246 R12: 00007fff20dcd820
R13: 00007f4621625fac R14: 00000000000082e0 R15: 00007f4621625fa0
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 75cf1182868b3cd79cf46cb8e3663149a2f402b8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:114
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xe45/0xf90 kernel/hung_task.c:423
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 75cf1182868b3cd79cf46cb8e3663149a2f402b8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:116
Code: cc cc cc cc cc cc cc b8 0f 5e 46 4c 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 e9 3e 00 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c2
RAX: ffff8881f6d00000 RBX: ffff8881036693c0 RCX: ffffffff85a8753d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 000000000011b1ec
RBP: ffffc900001a7e00 R08: ffff8881f6d396fb R09: 1ffff1103eda72df
R10: dffffc0000000000 R11: ffffed103eda72e0 R12: 0000000000000000
R13: 1ffff110206cd278 R14: dffffc0000000000 R15: ffffffff886da668
FS:  0000000000000000(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e3bb1a3ef0 CR3: 000000010c750000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 000000000000293c DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:-1 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:754
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
 default_idle_call+0x3e/0x80 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:193 [inline]
 do_idle+0x1df/0x570 kernel/sched/idle.c:346
 cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:445
 start_secondary+0x12e/0x140 arch/x86/kernel/smpboot.c:314
 common_startup_64+0x13b/0x157
 </TASK>