rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6349/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=7801, q=1071 ncpus=2)
task:syz.2.135       state:R  running task     stack:27688 pid:6349  tgid:6348  ppid:5821   task_flags:0x400140 flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7090
 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:__sanitizer_cov_trace_const_cmp8+0xe/0x20 kernel/kcov.c:321
Code: ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 0c 24 48 89 f2 48 89 fe <bf> 07 00 00 00 e9 f8 fd ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90
RSP: 0018:ffffc9000c3874c8 EFLAGS: 00000202
RAX: 0000000000080000 RBX: ffff88805adfa102 RCX: ffffffff8b65005e
RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000002
RBP: ffffc9000c387540 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000006 R11: 0000000000000000 R12: 0000000000000002
R13: ffff8881494a8b00 R14: 0000000000000002 R15: 0000000000000001
 xa_is_node include/linux/xarray.h:1264 [inline]
 xas_load+0x3e/0x5b0 lib/xarray.c:241
 filemap_get_entry+0x109/0x3b0 mm/filemap.c:1871
 shmem_get_folio_gfp+0x220/0x1530 mm/shmem.c:2469
 shmem_fault+0x204/0xb10 mm/shmem.c:2746
 __do_fault+0x10a/0x490 mm/memory.c:4989
 do_read_fault mm/memory.c:5409 [inline]
 do_fault mm/memory.c:5543 [inline]
 do_pte_missing+0xed5/0x3ea0 mm/memory.c:4059
 handle_pte_fault mm/memory.c:5888 [inline]
 __handle_mm_fault+0x1043/0x2a50 mm/memory.c:6031
 handle_mm_fault+0x404/0xae0 mm/memory.c:6200
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0x771/0x36f0 mm/gup.c:1491
 populate_vma_page_range+0x278/0x3a0 mm/gup.c:1929
 __mm_populate+0x1d8/0x380 mm/gup.c:2032
 mm_populate include/linux/mm.h:3377 [inline]
 vm_mmap_pgoff+0x362/0x450 mm/util.c:584
 ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:607
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7882f8d169
RSP: 002b:00007f7882df7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f78831a5fa0 RCX: 00007f7882f8d169
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f788300e2a0 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f78831a5fa0 R15: 00007ffe25ab5428
 </TASK>