rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8564/1:b..l
	(detected by 1, t=10502 jiffies, g=250633, q=13040)
task:syz-executor.2  state:R  running task     stack:23448 pid: 8564 ppid:     1 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4987 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6268
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6434
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
 __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 _raw_read_unlock+0x36/0x40 kernel/locking/spinlock.c:260
 zap_pid_ns_processes+0x271/0x660 kernel/pid_namespace.c:207
 find_child_reaper kernel/exit.c:548 [inline]
 forget_original_parent kernel/exit.c:637 [inline]
 exit_notify kernel/exit.c:674 [inline]
 do_exit+0x243d/0x2b40 kernel/exit.c:852
 do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x34c/0x28b0 kernel/signal.c:2837
 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: 0033:0x7f6c1a5ad811
RSP: 002b:00007ffc683c8240 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 00000000000029c2 RCX: 00007f6c1a5ad811
RDX: 00007ffc683c8280 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc683c830c R08: 0000000000000000 R09: 00007ffc683f4080
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000017
R13: 00000000001b78ed R14: 0000000000000000 R15: 00007ffc683c8370
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 896 jiffies! g250633 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=99516
rcu: rcu_preempt kthread starved for 897 jiffies! g250633 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28688 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4987 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6268
 schedule+0xd2/0x260 kernel/sched/core.c:6341
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128
 kthread+0x405/0x4f0 kernel/kthread.c:327
 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3183 Comm: syz-executor.5 Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__perf_event_account_interrupt+0x103/0x2c0 kernel/events/core.c:9144
Code: 9d 09 01 00 00 31 ff 83 e3 04 89 de e8 d6 30 e1 ff 84 db 75 69 e8 ed 2c e1 ff 44 89 e0 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 <e8> d8 2c e1 ff 4c 8d ad 10 02 00 00 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000007bc0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 00000000000300a2 RCX: 00000000000300a2
RDX: 0000000000000000 RSI: ffff8880843bba80 RDI: 0000000000000003
RBP: ffff88801d5cc0a0 R08: 00000000000300a2 R09: ffff88801d5cc503
R10: ffffffff8196767f R11: 0000000000000000 R12: 0000000000000001
R13: 00000000000300a2 R14: 000000000000007f R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa63d7ab018 CR3: 00000000224f6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __perf_event_overflow+0xb1/0x3d0 kernel/events/core.c:9191
 perf_swevent_hrtimer+0x37c/0x3f0 kernel/events/core.c:10597
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 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:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
Code: 48 89 ef 5d e9 91 2a 46 00 5d be 03 00 00 00 e9 c6 65 5f 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 f9 cb 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc90004cef760 EFLAGS: 00000246
RAX: ffffea0000ebf880 RBX: 8000000000000007 RCX: 0000000000000000
RDX: ffff8880843bba80 RSI: ffffffff81ac7526 RDI: 0000000000000003
RBP: ffffea0000ebf880 R08: 000000000003afe2 R09: ffff8880843bba87
R10: ffffffff81ac74d0 R11: 0000000000000000 R12: 800000003afe2007
R13: ffff88815e498fc0 R14: dffffc0000000000 R15: 00007f8df4ff9000
 zap_pte_range mm/memory.c:1346 [inline]
 zap_pmd_range mm/memory.c:1471 [inline]
 zap_pud_range mm/memory.c:1500 [inline]
 zap_p4d_range mm/memory.c:1521 [inline]
 unmap_page_range+0xb64/0x29f0 mm/memory.c:1542
 unmap_single_vma+0x198/0x310 mm/memory.c:1587
 unmap_vmas+0x16b/0x2f0 mm/memory.c:1619
 exit_mmap+0x1d0/0x630 mm/mmap.c:3170
 __mmput+0x122/0x4b0 kernel/fork.c:1164
 mmput+0x56/0x60 kernel/fork.c:1185
 exit_mm kernel/exit.c:507 [inline]
 do_exit+0xb27/0x2b40 kernel/exit.c:819
 do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x34c/0x28b0 kernel/signal.c:2837
 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: 0033:0x7f8df6ed6ae9
Code: Unable to access opcode bytes at RIP 0x7f8df6ed6abf.
RSP: 002b:00007f8df444c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f8df6fe9f68 RCX: 00007f8df6ed6ae9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8df6fe9f68
RBP: 00007f8df6fe9f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8df6fe9f6c
R13: 00007ffd897812df R14: 00007f8df444c300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	9d                   	popfq
   1:	09 01                	or     %eax,(%rcx)
   3:	00 00                	add    %al,(%rax)
   5:	31 ff                	xor    %edi,%edi
   7:	83 e3 04             	and    $0x4,%ebx
   a:	89 de                	mov    %ebx,%esi
   c:	e8 d6 30 e1 ff       	callq  0xffe130e7
  11:	84 db                	test   %bl,%bl
  13:	75 69                	jne    0x7e
  15:	e8 ed 2c e1 ff       	callq  0xffe12d07
  1a:	44 89 e0             	mov    %r12d,%eax
  1d:	48 83 c4 08          	add    $0x8,%rsp
  21:	5b                   	pop    %rbx
  22:	5d                   	pop    %rbp
  23:	41 5c                	pop    %r12
  25:	41 5d                	pop    %r13
  27:	41 5e                	pop    %r14
  29:	c3                   	retq
* 2a:	e8 d8 2c e1 ff       	callq  0xffe12d07 <-- trapping instruction
  2f:	4c 8d ad 10 02 00 00 	lea    0x210(%rbp),%r13
  36:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3d:	fc ff df