rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8007/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=31441, q=599 ncpus=2)
task:syz-executor.2  state:R  running task     stack:24112 pid:8007  tgid:8004  ppid:7419   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 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:rcu_read_unlock include/linux/rcupdate.h:810 [inline]
RIP: 0010:blk_cgroup_congested+0x185/0x220 block/blk-cgroup.c:2195
Code: 48 89 df e8 fd 2c 62 fd eb ae e8 b6 68 fc fc 31 ed eb 12 e8 ad 68 fc fc eb 05 e8 a6 68 fc fc 85 db 40 0f 95 c5 e8 3b e0 ec 06 <89> c3 31 ff 89 c6 e8 d0 6c fc fc 85 db 74 10 e8 a7 98 e2 fc 84 c0
RSP: 0018:ffffc900048def98 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88801168da00
RDX: ffffc90016f03000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 0000000000000000 R08: ffffffff8499bdfe R09: 1ffff1100397694a
R10: dffffc0000000000 R11: ffffed100397694b R12: 0000000000000a10
R13: 0000000000000cc0 R14: ffffffff8499bcfd R15: dffffc0000000000
 __folio_throttle_swaprate+0x84/0x1d0 mm/swapfile.c:3695
 folio_throttle_swaprate include/linux/swap.h:632 [inline]
 shmem_add_to_page_cache+0x89c/0x1830 mm/shmem.c:778
 shmem_alloc_and_add_folio+0x46c/0xdb0 mm/shmem.c:1689
 shmem_get_folio_gfp+0x82d/0x1f50 mm/shmem.c:2055
 shmem_fault+0x252/0x6f0 mm/shmem.c:2255
 __do_fault+0x137/0x460 mm/memory.c:4562
 do_read_fault mm/memory.c:4926 [inline]
 do_fault mm/memory.c:5056 [inline]
 do_pte_missing mm/memory.c:3903 [inline]
 handle_pte_fault+0x3d8d/0x7130 mm/memory.c:5380
 __handle_mm_fault mm/memory.c:5523 [inline]
 handle_mm_fault+0x10df/0x1ba0 mm/memory.c:5688
 faultin_page mm/gup.c:1290 [inline]
 __get_user_pages+0x6ef/0x1590 mm/gup.c:1589
 populate_vma_page_range+0x264/0x330 mm/gup.c:2029
 __mm_populate+0x27a/0x460 mm/gup.c:2132
 mm_populate include/linux/mm.h:3464 [inline]
 vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:578
 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: 0033:0x7fa2ee07cea9
RSP: 002b:00007fa2eede30c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fa2ee1b4050 RCX: 00007fa2ee07cea9
RDX: b635773f07ebbeea RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fa2ee0ebff4 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fa2ee1b4050 R15: 00007ffce614f838
 </TASK>
rcu: rcu_preempt kthread starved for 10244 jiffies! g31441 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26448 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112