rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11111/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=38757, q=1146813 ncpus=2)
task:syz.0.1476      state:R  running task     stack:26784 pid:11111 tgid:11110 ppid:5814   task_flags:0x40054c flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6765
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7087
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire.part.0+0x155/0x380 kernel/locking/lockdep.c:5816
Code: b8 ff ff ff ff 65 0f c1 05 50 c8 6b 7e 83 f8 01 0f 85 d0 01 00 00 9c 58 f6 c4 02 0f 85 e5 01 00 00 48 85 ed 0f 85 b6 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7
RSP: 0018:ffffc90003086fc0 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 1ffff92000610df9 RCX: 00000000702d03eb
RDX: 0000000000000001 RSI: ffffffff8b6cff80 RDI: ffffffff8bd369a0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff2dd8d98
R10: ffffffff96ec6cc7 R11: 0000000000000001 R12: 0000000000000000
R13: ffffffff8e1bd140 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 page_ext_get+0x3a/0x310 mm/page_ext.c:525
 __page_table_check_zero+0xbf/0x360 mm/page_table_check.c:148
 page_table_check_free include/linux/page_table_check.h:41 [inline]
 free_pages_prepare mm/page_alloc.c:1128 [inline]
 free_unref_folios+0xa99/0x1500 mm/page_alloc.c:2707
 folios_put_refs+0x587/0x7b0 mm/swap.c:994
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x586/0x1170 mm/shmem.c:1112
 shmem_truncate_range mm/shmem.c:1224 [inline]
 shmem_evict_inode+0x3a3/0xba0 mm/shmem.c:1352
 evict+0x409/0x960 fs/inode.c:796
 iput_final fs/inode.c:1946 [inline]
 iput fs/inode.c:1972 [inline]
 iput+0x52a/0x890 fs/inode.c:1958
 dentry_unlink_inode+0x29c/0x480 fs/dcache.c:440
 __dentry_kill+0x1d0/0x600 fs/dcache.c:643
 shrink_kill fs/dcache.c:1088 [inline]
 shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1115
 shrink_dcache_parent+0xe2/0x530 fs/dcache.c:1549
 do_one_tree fs/dcache.c:1578 [inline]
 shrink_dcache_for_umount+0xa1/0x3e0 fs/dcache.c:1595
 generic_shutdown_super+0x6c/0x390 fs/super.c:620
 kill_anon_super fs/super.c:1237 [inline]
 kill_litter_super+0x70/0xa0 fs/super.c:1247
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1413
 task_work_run+0x14e/0x250 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xad8/0x2db0 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 get_signal+0x24ed/0x26c0 kernel/signal.c:3036
 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: 0033:0x7f4217f8d169
RSP: 002b:00007f4218e85038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: 0000000000013d18 RBX: 00007f42181a5fa0 RCX: 00007f4217f8d169
RDX: 0000000000013d18 RSI: 0000400000019680 RDI: 0000000000000003
RBP: 00007f421800e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f42181a5fa0 R15: 00007ffd92768968
 </TASK>