rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12918/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=107021, q=543 ncpus=2)
task:syz-executor.3  state:R  running task     stack:25648 pid:12918 tgid:12918 ppid:11853  flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
 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_switch+0x5a/0x90 kernel/kcov.c:342
Code: 4c 8b 75 00 31 db 4d 85 f6 74 1e 48 8b 74 dd 10 4c 89 e2 4c 89 ef 48 83 c3 01 48 8b 4c 24 28 e8 8c fd ff ff 49 39 de 75 e2 5b <5d> 41 5c 41 5d 41 5e c3 cc cc cc cc 48 83 f8 40 41 bd 07 00 00 00
RSP: 0018:ffffc900036ef940 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880635f6e00 RCX: ffffffff8ad60200
RDX: ffff888020fa1e00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffffff8c817260 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000005 R14: 0000000000000004 R15: 000000001fffffff
 ma_slots lib/maple_tree.c:760 [inline]
 mas_get_slot lib/maple_tree.c:7057 [inline]
 mas_validate_gaps lib/maple_tree.c:7321 [inline]
 mt_validate+0x28b0/0x4390 lib/maple_tree.c:7596
 validate_mm+0x9c/0x4b0 mm/mmap.c:288
 mmap_region+0x13c0/0x2760 mm/mmap.c:3000
 do_mmap+0xbc7/0xf60 mm/mmap.c:1397
 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:573
 ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1443
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa5d2a7cf23
RSP: 002b:00007ffdaaa72788 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fa5d2bb42a8 RCX: 00007fa5d2a7cf23
RDX: 0000000000000003 RSI: 0000000000200000 RDI: 00007fa5d0801000
RBP: 00007fa5d0800000 R08: 00000000000000db R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 00007ffdaaa72908
R13: 00007ffdaaa728c0 R14: 00007fa5d2bb4210 R15: 00007fa5d2bb421c
 </TASK>
rcu: rcu_preempt kthread starved for 9909 jiffies! g107021 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:27680 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 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+0x1a/0x20 drivers/acpi/processor_idle.c:112