rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=89665, q=69)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295006069-4294995567), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g89665 f0x2 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:28720 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4986 [inline]
 __schedule+0xab2/0x4d90 kernel/sched/core.c:6296
 schedule+0xd2/0x260 kernel/sched/core.c:6369
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1963
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2136
 kthread+0x405/0x4f0 kernel/kthread.c:345
 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
CPU: 1 PID: 19647 Comm: syz-executor.3 Not tainted 5.16.0-rc4-next-20211208-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1654 [inline]
RIP: 0010:__hrtimer_run_queues+0x46a/0xe50 kernel/time/hrtimer.c:1749
Code: d4 5b 00 48 0f a3 2d 45 1e 2b 0c 40 0f 92 c5 31 ff 89 ee e8 d8 9e 10 00 40 84 ed 0f 85 14 06 00 00 e8 ea 9a 10 00 8b 6c 24 38 <48> 89 e8 48 c1 e0 07 49 8d 84 06 c8 00 00 00 48 89 c2 48 89 04 24
RSP: 0018:ffffc90000dc0e40 EFLAGS: 00000046
RAX: 0000000080010002 RBX: ffff888071a9a340 RCX: 0000000000000000
RDX: ffff88801cd33a80 RSI: ffffffff81674866 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81674ed8 R11: 0000000000000000 R12: 1766ed072ecdda0e
R13: ffff8880b9d2a740 R14: ffff8880b9d2a640 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556fdc708 CR3: 0000000057188000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:finish_task_switch.isra.0+0x323/0xb80 kernel/sched/core.c:4866
Code: 03 05 03 08 85 c0 75 02 0f 0b 48 85 db 0f 85 25 01 00 00 4c 89 f7 e8 fc f7 ff ff e8 67 7e 2d 00 fb 65 48 8b 1c 25 40 70 02 00 <48> 8d bb 88 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90003f2f540 EFLAGS: 00000206
RAX: 0000000000004077 RBX: ffff88801cd33a80 RCX: 1ffffffff1ff63de
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003f2f588 R08: 0000000000000001 R09: ffffffff8ff9e977
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b9d3aa18
R13: ffff888018031d40 R14: ffff8880b9d39cc0 R15: ffff8880b9d3a6f8
 context_switch kernel/sched/core.c:4989 [inline]
 __schedule+0xaba/0x4d90 kernel/sched/core.c:6296
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6462
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:394 [inline]
 zap_pte_range mm/memory.c:1409 [inline]
 zap_pmd_range mm/memory.c:1468 [inline]
 zap_pud_range mm/memory.c:1497 [inline]
 zap_p4d_range mm/memory.c:1518 [inline]
 unmap_page_range+0xfc0/0x32e0 mm/memory.c:1539
 unmap_single_vma+0x198/0x310 mm/memory.c:1584
 unmap_vmas+0x16b/0x2f0 mm/memory.c:1616
 exit_mmap+0x201/0x670 mm/mmap.c:3179
 __mmput+0x122/0x4b0 kernel/fork.c:1116
 mmput+0x56/0x60 kernel/fork.c:1137
 exit_mm kernel/exit.c:507 [inline]
 do_exit+0xb27/0x2c20 kernel/exit.c:819
 do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x34c/0x28b0 kernel/signal.c:2859
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7ff4035d7e99
Code: Unable to access opcode bytes at RIP 0x7ff4035d7e6f.
RSP: 002b:00007ff401f4d168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffe00 RBX: 00007ff4036eaf60 RCX: 00007ff4035d7e99
RDX: 0000000000000010 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007ff403632031 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd4a58e96f R14: 00007ff401f4d300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	48 0f a3 2d 45 1e 2b 	bt     %rbp,0xc2b1e45(%rip)        # 0xc2b1e4d
   7:	0c
   8:	40 0f 92 c5          	setb   %bpl
   c:	31 ff                	xor    %edi,%edi
   e:	89 ee                	mov    %ebp,%esi
  10:	e8 d8 9e 10 00       	callq  0x109eed
  15:	40 84 ed             	test   %bpl,%bpl
  18:	0f 85 14 06 00 00    	jne    0x632
  1e:	e8 ea 9a 10 00       	callq  0x109b0d
  23:	8b 6c 24 38          	mov    0x38(%rsp),%ebp
* 27:	48 89 e8             	mov    %rbp,%rax <-- trapping instruction
  2a:	48 c1 e0 07          	shl    $0x7,%rax
  2e:	49 8d 84 06 c8 00 00 	lea    0xc8(%r14,%rax,1),%rax
  35:	00
  36:	48 89 c2             	mov    %rax,%rdx
  39:	48 89 04 24          	mov    %rax,(%rsp)