rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P20849/1:b..l
	(detected by 0, t=10502 jiffies, g=117977, q=355 ncpus=2)
task:syz.1.4405      state:R  running task     stack:24600 pid:20849 ppid:18440  flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6873
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:lock_is_held_type+0x137/0x180
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000441f088 EFLAGS: 00000206
RAX: 68c5b577df100c00 RBX: 0000000000000003 RCX: 0000000080000000
RDX: ffffc90004d79000 RSI: ffffffff8b0c13c0 RDI: ffffffff8b5d5ba0
RBP: 0000000000000001 R08: ffffffff81eccaba R09: fffffbfff20e7245
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000246
R13: ffff88805d4a5940 R14: 00000000ffffffff R15: ffffffff8d32ad40
 lookup_page_ext mm/page_ext.c:277 [inline]
 page_ext_get+0x18e/0x2a0 mm/page_ext.c:158
 __page_table_check_zero+0x139/0x4b0 mm/page_table_check.c:146
 prep_new_page mm/page_alloc.c:2524 [inline]
 get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4283
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5551
 __folio_alloc+0xf/0x30 mm/page_alloc.c:5583
 vma_alloc_folio+0x486/0x990 mm/mempolicy.c:2243
 shmem_alloc_folio mm/shmem.c:1589 [inline]
 shmem_alloc_and_acct_folio+0x5a8/0xd50 mm/shmem.c:1613
 shmem_get_folio_gfp+0x13f0/0x3470 mm/shmem.c:1941
 shmem_get_folio mm/shmem.c:2072 [inline]
 shmem_write_begin+0x16e/0x4e0 mm/shmem.c:2559
 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3817
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3945
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3977
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x857/0xbc0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7951b77299
RSP: 002b:00007f79528fb048 EFLAGS: 00000246
 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7951d06058 RCX: 00007f7951b77299
RDX: 000000000208e24b RSI: 0000000020000240 RDI: 0000000000000005
RBP: 00007f7951be48e6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f7951d06058 R15: 00007ffc5661fab8
 </TASK>