rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13435/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=46525, q=4881 ncpus=2)
task:syz.6.1475      state:R  running task     stack:24048 pid:13435 tgid:13430 ppid:6245   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5853
Code: 2b 00 74 08 4c 89 f7 e8 3a 2b 8b 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900051fe8a0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000a3fd20 RCX: ffff88802b25e4d8
RDX: dffffc0000000000 RSI: ffffffff8c0aaae0 RDI: ffffffff8c5fb060
RBP: ffffc900051fe9f8 R08: ffffffff942a4887 R09: 1ffffffff2854910
R10: dffffc0000000000 R11: fffffbfff2854911 R12: 1ffff92000a3fd1c
R13: dffffc0000000000 R14: ffffc900051fe900 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 page_ext_get+0x3d/0x2a0 mm/page_ext.c:525
 __set_page_owner+0x9e/0x800 mm/page_owner.c:322
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1558
 prep_new_page mm/page_alloc.c:1566 [inline]
 get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3476
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4753
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269
 folio_alloc_mpol_noprof+0x36/0x50 mm/mempolicy.c:2287
 shmem_alloc_folio mm/shmem.c:1798 [inline]
 shmem_alloc_and_add_folio+0x4a0/0x1080 mm/shmem.c:1837
 shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2357
 shmem_fault+0x220/0x5b0 mm/shmem.c:2558
 __do_fault+0x137/0x390 mm/memory.c:4907
 do_read_fault mm/memory.c:5322 [inline]
 do_fault mm/memory.c:5456 [inline]
 do_pte_missing mm/memory.c:3979 [inline]
 handle_pte_fault+0x39eb/0x5ed0 mm/memory.c:5801
 __handle_mm_fault mm/memory.c:5944 [inline]
 handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6112
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0x1c82/0x49e0 mm/gup.c:1494
 populate_vma_page_range+0x264/0x330 mm/gup.c:1932
 __mm_populate+0x27a/0x460 mm/gup.c:2035
 mm_populate include/linux/mm.h:3396 [inline]
 vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:585
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd6ecb85d29
RSP: 002b:00007fd6ed97f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fd6ecd76080 RCX: 00007fd6ecb85d29
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fd6ecc01b08 R08: ffffffffffffffff R09: 0000000023108000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd6ecd76080 R15: 00007ffd38889e28
 </TASK>