rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11840/1:b..l
	(detected by 0, t=10502 jiffies, g=90121, q=195 ncpus=2)
task:syz.1.1061      state:R  running task     stack:25832 pid:11840 ppid:10817  flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_call_function_single+0x16/0x20 arch/x86/include/asm/idtentry.h:699
RIP: 0010:instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
RIP: 0010:atomic_inc include/linux/atomic/atomic-instrumented.h:190 [inline]
RIP: 0010:mt_validate_nulls lib/maple_tree.c:7192 [inline]
RIP: 0010:mt_validate+0x50b3/0x5ad0 lib/maple_tree.c:7243
Code: 0f 84 df 02 00 00 e8 cc c4 ec f6 48 bb 00 00 00 00 00 fc ff df 4c 8b 74 24 70 4c 0b 7c 24 10 0f 84 61 03 00 00 e8 ad c4 ec f6 <48> c7 c7 c0 56 7a 97 be 04 00 00 00 e8 ec 47 44 f7 f0 ff 05 f5 87
RSP: 0018:ffffc9000368f8a0 EFLAGS: 00000293
RAX: ffffffff8a9dceb3 RBX: dffffc0000000000 RCX: ffff88802c0e3b80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000368fa90 R08: ffffffff8a9dce87 R09: ffffffff8a9dcf1b
R10: 0000000000000003 R11: ffff88802c0e3b80 R12: 1ffff920006d1f33
R13: ffffc9000368f998 R14: ffff88807a270f00 R15: ffff888076b79fd8
 validate_mm_mt+0x165/0x670 mm/mmap.c:295
 validate_mm+0x16e/0x380 mm/mmap.c:332
 do_mmap+0xc7/0xf60 mm/mmap.c:1262
 vm_mmap_pgoff+0x1ca/0x2d0 mm/util.c:520
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f91a157e753
RSP: 002b:00007fff8664abe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f919fff76c0 RCX: 00007f91a157e753
RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 00007fff8664ad40
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10532 jiffies! g90121 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:26712 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </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:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:567