INFO: task syz.6.10082:31109 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.10082     state:D stack:0     pid:31109 tgid:31109 ppid:25486  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 request_wait_answer fs/fuse/dev.c:476 [inline]
 __fuse_request_send fs/fuse/dev.c:491 [inline]
 __fuse_simple_request+0xdb1/0x1980 fs/fuse/dev.c:586
 fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
 fuse_flush+0x909/0x1d50 fs/fuse/file.c:584
 filp_flush fs/open.c:1550 [inline]
 filp_close+0xc0/0x160 fs/open.c:1563
 __range_close fs/file.c:710 [inline]
 __close_range+0x50e/0x6c0 fs/file.c:767
 __do_sys_close_range fs/open.c:1616 [inline]
 __se_sys_close_range fs/open.c:1613 [inline]
 __x64_sys_close_range+0x7e/0x90 fs/open.c:1613
 x64_sys_call+0x1686/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:437
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f7d1558f6c9
RSP: 002b:00007ffdd705f8c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f7d157e7da0 RCX: 00007f7d1558f6c9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f7d157e7da0 R08: 00000000000000a0 R09: 00000009d705fbbf
R10: 00007f7d157e7cb0 R11: 0000000000000246 R12: 00000000000c1683
R13: 00007ffdd705f9c0 R14: ffffffffffffffff R15: 00007ffdd705f9e0
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xd8f/0xed0 kernel/hung_task.c:423
 kthread+0x2ca/0x370 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: 3219 Comm: syz.7.11585 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:stac include/linux/instrumented.h:129 [inline]
RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
RIP: 0010:raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
RIP: 0010:_inline_copy_from_user include/linux/uaccess.h:178 [inline]
RIP: 0010:_copy_from_user+0x60/0xb0 lib/usercopy.c:18
Code: f7 31 f6 4c 89 fa e8 5f 50 36 ff eb 4b 49 bc 00 f0 ff ff ff 7f 00 00 4d 39 fc 4d 19 e4 4d 09 fc 4c 89 f7 89 de e8 10 50 36 ff <0f> 01 cb 48 89 d9 4c 89 e6 4c 89 f7 e8 1f 3e e6 02 49 89 cf 0f 01
RSP: 0018:ffffc900050f7bb0 EFLAGS: 00000256
RAX: 0000000000000001 RBX: 0000000000000018 RCX: ffffffff82a61f20
RDX: 0000000000000001 RSI: 0000000000000018 RDI: ffffc900050f7c40
RBP: ffffc900050f7bd0 R08: ffffc900050f7c57 R09: 1ffff92000a1ef8a
R10: dffffc0000000000 R11: fffff52000a1ef8b R12: 00007f9dd6fe6a90
R13: dffffc0000000000 R14: ffffc900050f7c40 R15: 00007f9dd6fe6a90
FS:  00007f9dd6fe76c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555740a84a8 CR3: 0000000110fde000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 copy_from_user include/linux/uaccess.h:212 [inline]
 restore_altstack+0x9e/0x4c0 kernel/signal.c:4363
 __ia32_sys_rt_sigreturn+0x200/0x7a0 arch/x86/kernel/signal_64.c:265
 x64_sys_call+0x2c14/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:16
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9dd612b779
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f9dd6fe6a80 EFLAGS: 00000202 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f9dd63e6090 RCX: 00007f9dd612b779
RDX: 00007f9dd6fe6a80 RSI: 00007f9dd6fe6bb0 RDI: 0000000000000021
RBP: 00007f9dd6211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f9dd63e6128 R14: 00007f9dd63e6090 R15: 00007ffff526e118
 </TASK>