INFO: task syz.7.11132:14352 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc2-syzkaller-00382-gdccbe2047a5b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.11132     state:D stack:27896 pid:14352 tgid:14352 ppid:5110   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
 __mutex_lock_common kernel/locking/mutex.c:665 [inline]
 __mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735
 nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625
 nfsd_umount+0x48/0xe0 fs/nfsd/nfsctl.c:1428
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1373
 task_work_run+0x14e/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xadd/0x2d70 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 get_signal+0x2576/0x2610 kernel/signal.c:3017
 arch_do_signal_or_restart+0x90/0x7e0 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:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff53185d19
RSP: 002b:00007eff53f030e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007eff53376088 RCX: 00007eff53185d19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007eff53376088
RBP: 00007eff53376080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007eff5337608c
R13: 0000000000000000 R14: 00007ffe445ae0e0 R15: 00007ffe445ae1c8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.13.0-rc2-syzkaller-00382-gdccbe2047a5b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
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:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
 watchdog+0xf14/0x1240 kernel/hung_task.c:397
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 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: 18540 Comm: syz.4.12042 Not tainted 6.13.0-rc2-syzkaller-00382-gdccbe2047a5b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:107 [inline]
RIP: 0010:raw_atomic_try_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:2170 [inline]
RIP: 0010:atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1302 [inline]
RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
RIP: 0010:do_raw_spin_lock+0x131/0x2c0 kernel/locking/spinlock_debug.c:116
Code: 00 00 48 89 df be 04 00 00 00 c7 44 24 28 00 00 00 00 e8 32 07 85 00 be 04 00 00 00 48 8d 7c 24 28 e8 23 07 85 00 8b 44 24 28 <ba> 01 00 00 00 89 44 24 04 f0 0f b1 13 0f 85 95 00 00 00 65 44 8b
RSP: 0018:ffffc90004fd6ef0 EFLAGS: 00000297
RAX: 0000000000000000 RBX: ffff88807e343440 RCX: ffffffff8176c2fd
RDX: fffff520009fade3 RSI: 0000000000000004 RDI: ffffc90004fd6f18
RBP: 1ffff920009faddf R08: 0000000000000001 R09: fffff520009fade3
R10: 0000000000000003 R11: 0000000000012e23 R12: ffff88807e343448
R13: ffff88807e343450 R14: ffff88807e343440 R15: ffff88807e3435f0
FS:  00007f4d127dd6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d11b47ab8 CR3: 00000000a097c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 spin_lock include/linux/spinlock.h:351 [inline]
 shmem_recalc_inode+0x27/0x180 mm/shmem.c:442
 shmem_alloc_and_add_folio+0x833/0xc00 mm/shmem.c:1891
 shmem_get_folio_gfp+0x689/0x1530 mm/shmem.c:2355
 shmem_get_folio mm/shmem.c:2461 [inline]
 shmem_write_begin+0x161/0x300 mm/shmem.c:3117
 generic_perform_write+0x2ba/0x920 mm/filemap.c:4055
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3293
 __kernel_write_iter+0x318/0xa80 fs/read_write.c:612
 dump_emit_page fs/coredump.c:884 [inline]
 dump_user_range+0x389/0x8c0 fs/coredump.c:945
 elf_core_dump+0x2787/0x3880 fs/binfmt_elf.c:2129
 do_coredump+0x2dd5/0x43e0 fs/coredump.c:758
 get_signal+0x23f3/0x2610 kernel/signal.c:3002
 arch_do_signal_or_restart+0x90/0x7e0 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:329 [inline]
 irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x21000
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 002b:000000000000000a EFLAGS: 00010282
RAX: 0000000000000002 RBX: 00007f4d11b76080 RCX: 00007f4d11985d19
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000020003b46
RBP: 00007f4d11a01a20 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4d11b76080 R15: 00007fff57379c38
 </TASK>