INFO: task syz.1.1136:9858 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1136      state:D stack:25224 pid:9858  tgid:9858  ppid:5859   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: 0033:0x7fb34b58ebe9
RSP: 002b:00007ffc10b84618 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fb34b7b7da0 RCX: 00007fb34b58ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb34b7b7da0 R08: 00000000000000e4 R09: 0000000d10b8490f
R10: 00007fb34b7b7cb0 R11: 0000000000000246 R12: 000000000003467e
R13: 00007fb34b7b6090 R14: ffffffffffffffff R15: 00007ffc10b84730
 </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: 13380 Comm: syz.9.2119 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:page_ext_iter_next_fast_possible include/linux/page_ext.h:80 [inline]
RIP: 0010:page_ext_iter_next include/linux/page_ext.h:155 [inline]
RIP: 0010:page_table_check_clear+0x3ad/0x700 mm/page_table_check.c:78
Code: 31 ff e8 b6 3b 91 ff 41 ff ce 0f 88 c3 01 00 00 e8 68 37 91 ff 4e 8d 34 2b 4c 89 f6 48 81 e6 ff 7f 00 00 31 ff e8 33 3c 91 ff <4c> 89 f0 48 25 ff 7f 00 00 74 2f e8 43 37 91 ff 48 b8 00 00 00 00
RSP: 0018:ffffc900198ff590 EFLAGS: 00000293
RAX: ffffffff822f977d RBX: 0000000000046cab RCX: ffff888027721e00
RDX: 0000000000000000 RSI: 0000000000006cac RDI: 0000000000000000
RBP: ffff88801ce1f570 R08: ffff88801ce1f5bb R09: 1ffff110039c3eb7
R10: dffffc0000000000 R11: ffffed10039c3eb8 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000046cac R15: ffff88801ce1f5b8
FS:  0000000000000000(0000) GS:ffff8881257c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd8ae41ff8 CR3: 000000002f0f8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
 clear_full_ptes include/linux/pgtable.h:785 [inline]
 zap_present_folio_ptes mm/memory.c:1640 [inline]
 zap_present_ptes mm/memory.c:1709 [inline]
 do_zap_pte_range mm/memory.c:1810 [inline]
 zap_pte_range mm/memory.c:1854 [inline]
 zap_pmd_range mm/memory.c:1946 [inline]
 zap_pud_range mm/memory.c:1975 [inline]
 zap_p4d_range mm/memory.c:1996 [inline]
 unmap_page_range+0x3466/0x4370 mm/memory.c:2017
 unmap_single_vma mm/memory.c:2060 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:2104
 exit_mmap+0x248/0xb50 mm/mmap.c:1280
 __mmput+0x118/0x420 kernel/fork.c:1133
 exit_mm+0x1da/0x2c0 kernel/exit.c:582
 do_exit+0x648/0x2300 kernel/exit.c:949
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f1e4118ebe9
Code: Unable to access opcode bytes at 0x7f1e4118ebbf.
RSP: 002b:00007ffd939607c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1e4118ebe9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd9396082c R08: 0000001e939608bf R09: 00000000000927c0
R10: 000000000000023c R11: 0000000000000246 R12: 0000000000000161
R13: 00000000000927c0 R14: 000000000005b869 R15: 00007ffd93960880
 </TASK>