INFO: task syz-executor:7988 blocked for more than 163 seconds.
      Tainted: G     U              6.17.0-rc1-syzkaller-00211-g90d970cade8e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24248 pid:7988  tgid:7988  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x82a/0x10b0 kernel/locking/mutex.c:760
 nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:596
 nfsd_umount+0x48/0xe0 fs/nfsd/nfsctl.c:1386
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1378
 task_work_run+0x150/0x240 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x3f6/0x490 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f83c198ff17
RSP: 002b:00007fff639c24c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f83c1a11c05 RCX: 00007f83c198ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff639c3610
RBP: 00007fff639c35fc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff639c3610
R13: 00007f83c1a11c05 R14: 00000000000475e8 R15: 00007fff639c3650
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G     U              6.17.0-rc1-syzkaller-00211-g90d970cade8e #0 PREEMPT(full) 
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xf0e/0x1260 kernel/hung_task.c:491
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14621 Comm: syz.7.2816 Tainted: G     U              6.17.0-rc1-syzkaller-00211-g90d970cade8e #0 PREEMPT(full) 
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:count_memcg_events+0xe/0x4f0 mm/memcontrol.c:832
Code: eb bf 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 41 57 41 56 41 55 41 54 55 53 <89> f3 48 83 ec 28 48 89 7c 24 08 89 5c 24 24 48 89 54 24 18 83 fb
RSP: 0018:ffffc90003387a28 EFLAGS: 00000246
RAX: 0000000000080000 RBX: ffff88807dd51a00 RCX: ffffc9001bc57000
RDX: 0000000000000001 RSI: 0000000000000017 RDI: ffff88807dd51a00
RBP: 0000000000000015 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000010404 R12: 0000000000004200
R13: 0000000000000000 R14: ffff888057148150 R15: ffff888057148160
FS:  00007fad34a806c0(0000) GS:ffff8881247c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b343fdff8 CR3: 000000007a33e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 count_memcg_events_mm include/linux/memcontrol.h:980 [inline]
 count_memcg_event_mm include/linux/memcontrol.h:987 [inline]
 mm_account_fault mm/memory.c:6229 [inline]
 handle_mm_fault+0x27b/0xd10 mm/memory.c:6390
 faultin_page mm/gup.c:1144 [inline]
 __get_user_pages+0x551/0x34a0 mm/gup.c:1446
 __get_user_pages_locked mm/gup.c:1712 [inline]
 faultin_page_range+0x338/0x940 mm/gup.c:1932
 madvise_populate mm/madvise.c:979 [inline]
 madvise_do_behavior+0x34c/0x530 mm/madvise.c:1883
 do_madvise+0x176/0x240 mm/madvise.c:1978
 __do_sys_madvise mm/madvise.c:1987 [inline]
 __se_sys_madvise mm/madvise.c:1985 [inline]
 __x64_sys_madvise+0xa9/0x110 mm/madvise.c:1985
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fad33b8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fad34a80038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007fad33db5fa0 RCX: 00007fad33b8ebe9
RDX: 0000000000000017 RSI: ffffffffffff0005 RDI: 0000000000000000
RBP: 00007fad33c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fad33db6038 R14: 00007fad33db5fa0 R15: 00007ffdf8bd3588
 </TASK>