rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9751/1:b..l
	(detected by 1, t=10502 jiffies, g=24565, q=396)
task:syz.4.1244      state:R  running task     stack:26592 pid: 9751 ppid:  4168 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6780
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:xas_start+0x331/0x770 lib/xarray.c:193
Code: e8 03 48 bd 00 00 00 00 00 fc ff df 0f b6 04 28 84 c0 0f 85 d9 03 00 00 45 0f b6 24 24 bf 40 00 00 00 44 89 e6 e8 7f dd 77 fd <41> 83 fc 3f 0f 87 d8 03 00 00 e8 10 db 77 fd 44 89 e1 49 d3 ee bf
RSP: 0018:ffffc9000303f6b0 EFLAGS: 00000297
RAX: ffffffff83ffe2f1 RBX: ffff8880608b4dc2 RCX: ffff88801d621dc0
RDX: 0000000000000002 RSI: 0000000000000006 RDI: 0000000000000040
RBP: dffffc0000000000 R08: ffff88801d621dc0 R09: 0000000000000002
R10: 0000000000000003 R11: 0000000000000002 R12: 0000000000000006
R13: ffffc9000303f838 R14: 0000000000000090 R15: 1ffff92000607f07
 xas_load lib/xarray.c:233 [inline]
 xas_find+0x154/0xab0 lib/xarray.c:1249
 first_map_page mm/filemap.c:3288 [inline]
 filemap_map_pages+0x203/0x1390 mm/filemap.c:3314
 do_fault_around mm/memory.c:4243 [inline]
 do_read_fault mm/memory.c:4258 [inline]
 do_fault mm/memory.c:4392 [inline]
 handle_pte_fault mm/memory.c:4650 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x2580/0x43c0 mm/memory.c:4883
 faultin_page mm/gup.c:976 [inline]
 __get_user_pages+0x93e/0x11c0 mm/gup.c:1197
 populate_vma_page_range+0x213/0x290 mm/gup.c:1529
 __mm_populate+0x26f/0x3a0 mm/gup.c:1638
 mm_populate include/linux/mm.h:2632 [inline]
 vm_mmap_pgoff+0x203/0x2b0 mm/util.c:556
 ksys_mmap_pgoff+0x140/0x780 mm/mmap.c:1623
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd32dba7969
RSP: 002b:00007fd32ba0f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fd32ddcefa0 RCX: 00007fd32dba7969
RDX: b635773f06ebbeea RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fd32dc29ab1 R08: ffffffffffffffff R09: 0000000028f43000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd32ddcefa0 R15: 00007ffe20e65ce8
 </TASK>
rcu: rcu_preempt kthread starved for 10292 jiffies! g24565 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:28128 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:722