rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P14956/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=49749, q=1229446 ncpus=2)
task:syz.0.3532      state:R  running task     stack:26760 pid:14956 tgid:14955 ppid:14203  task_flags:0x400040 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5401 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7113
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5896
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 2b fe 01 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000cee7378 EFLAGS: 00000206
RAX: 9716b5ce8bf44400 RBX: 0000000000000202 RCX: 9716b5ce8bf44400
RDX: 0000000000000002 RSI: ffffffff8db865be RDI: ffffffff8be29dc0
RBP: ffff88802a3f4740 R08: ffff88801cd2b91f R09: 1ffff110039a5723
R10: dffffc0000000000 R11: ffffed10039a5724 R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8e13f160 R15: ffff88802a3f3c00
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 __page_table_check_zero+0x406/0x530 mm/page_table_check.c:145
 page_table_check_alloc include/linux/page_table_check.h:35 [inline]
 post_alloc_hook+0x253/0x2a0 mm/page_alloc.c:1705
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
 folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2438
 shmem_alloc_folio mm/shmem.c:1851 [inline]
 shmem_alloc_and_add_folio+0x447/0xf60 mm/shmem.c:1890
 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2536
 shmem_get_folio mm/shmem.c:2642 [inline]
 shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3292
 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3467
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x54b/0xa90 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f840438d3df
RSP: 002b:00007f840516cdf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000013bd7ef RCX: 00007f840438d3df
RDX: 00000000013bd7ef RSI: 00007f83f9c00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000055a2
R10: 00002000000014c2 R11: 0000000000000293 R12: 0000000000000003
R13: 00007f840516cef0 R14: 00007f840516ceb0 R15: 00007f83f9c00000
 </TASK>