INFO: task syz.1.5724:17774 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.5724      state:D stack:0     pid:17774 tgid:17773 ppid:15498  flags:0x00004004
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_rmdir+0x2c7/0x1a50 fs/fuse/dir.c:1290
 vfs_rmdir+0x3dd/0x560 fs/namei.c:4340
 do_rmdir+0x26a/0x560 fs/namei.c:4399
 __do_sys_rmdir fs/namei.c:4418 [inline]
 __se_sys_rmdir fs/namei.c:4416 [inline]
 __x64_sys_rmdir+0x4b/0x60 fs/namei.c:4416
 x64_sys_call+0xaf7/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:85
 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: 0033:0x7f87fcb8f6c9
RSP: 002b:00007f87fda64038 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007f87fcde5fa0 RCX: 00007f87fcb8f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000040
RBP: 00007f87fcc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f87fcde6038 R14: 00007f87fcde5fa0 R15: 00007ffcd2be1a38
 </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: 21021 Comm: syz-executor Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
RIP: 0010:page_expected_state mm/page_alloc.c:1015 [inline]
RIP: 0010:free_page_is_bad mm/page_alloc.c:1063 [inline]
RIP: 0010:free_pages_prepare mm/page_alloc.c:1343 [inline]
RIP: 0010:free_unref_page+0x973/0xee0 mm/page_alloc.c:2842
Code: f3 0f 1e fa 4d 8d 7e 30 4c 89 ff be 04 00 00 00 e8 52 08 07 00 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 0f 85 16 05 00 00 41 8b 07 83 f8 ff 0f 85 f9 04 00 00 48 b8
RSP: 0018:ffffc90003bbf740 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffea0004ee2e98 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea0004ee2eb0
RBP: ffffc90003bbf838 R08: ffffea0004ee2eb3 R09: 1ffffd40009dc5d6
R10: dffffc0000000000 R11: fffff940009dc5d7 R12: ffffea0004ee2e88
R13: 1ffffd40009dc5d3 R14: ffffea0004ee2e80 R15: ffffea0004ee2eb0
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005607e521db98 CR3: 000000010bb66000 CR4: 00000000003526b0
DR0: 000000000000a7d0 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __free_pages+0x6b/0x3b0 mm/page_alloc.c:5351
 vfree+0x3bf/0x580 mm/vmalloc.c:3396
 kcov_put kernel/kcov.c:439 [inline]
 kcov_close+0x2c/0x70 kernel/kcov.c:535
 __fput+0x1fb/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e0/0x250 kernel/task_work.c:240
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x9bc/0x2630 kernel/exit.c:953
 do_group_exit+0x22a/0x300 kernel/exit.c:1095
 get_signal+0x139d/0x14f0 kernel/signal.c:2933
 arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f0e84d857d3
Code: Unable to access opcode bytes at 0x7f0e84d857a9.
RSP: 002b:00007ffdd96d75c8 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 0000000000005222 RCX: 00007f0e84d857d3
RDX: 0000000040000000 RSI: 00007ffdd96d75dc RDI: 00000000ffffffff
RBP: 00007ffdd96d75dc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffdd96d78c8 R15: 0000000000000000
 </TASK>