rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=db1/1/0x4000000000000000 softirq=46704/46704 fqs=0 
	(detected by 0, t=10502 jiffies, g=76097, q=2279)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 25043 Comm: syz-executor.5 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strlen+0x54/0x90 lib/string.c:487
Code: 75 48 80 7d 00 00 74 39 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a <38> ca 7f 04 84 d2 75 1f 80 38 00 75 de 48 83 c4 08 48 29 e8 5b 5d
RSP: 0018:ffffc90000dc0b28 EFLAGS: 00000006
RAX: ffffffff89e4a28b RBX: dffffc0000000000 RCX: 0000000000000003
RDX: 0000000000000000 RSI: ffffffff90468728 RDI: ffffffff89e4a280
RBP: ffffffff89e4a280 R08: 0000000000000000 R09: 0000000000000001
R10: fffffbfff1adf88a R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8b880de0 R14: ffffffff90468728 R15: ffffc90000dc0c08
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a45dbdca0 CR3: 000000002a5e9000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 strlen include/linux/fortify-string.h:102 [inline]
 trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline]
 perf_trace_lock_acquire+0xbe/0x550 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x416/0x510 kernel/locking/lockdep.c:5611
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
 debug_object_deactivate lib/debugobjects.c:735 [inline]
 debug_object_deactivate+0x101/0x300 lib/debugobjects.c:723
 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline]
 debug_deactivate kernel/time/hrtimer.c:481 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1653 [inline]
 __hrtimer_run_queues+0x3f8/0xe50 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:strlen+0x5f/0x90 lib/string.c:487
Code: 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a 38 ca 7f 04 84 d2 75 1f 80 38 00 <75> de 48 83 c4 08 48 29 e8 5b 5d c3 48 83 c4 08 31 c0 5b 5d c3 e8
RSP: 0018:ffffc900060df4e8 EFLAGS: 00000206
RAX: ffffffff898d63a8 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8b983a20 RDI: ffffffff898d63a0
RBP: ffffffff898d63a0 R08: 0000000000000002 R09: 0000000000000000
R10: fffffbfff1adf88a R11: 0000000000000000 R12: 0000000000000002
R13: ffffffff8b880de0 R14: ffffffff8b983a20 R15: ffffc900060df5c8
 strlen include/linux/fortify-string.h:102 [inline]
 trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline]
 perf_trace_lock_acquire+0xbe/0x550 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x416/0x510 kernel/locking/lockdep.c:5611
 rcu_lock_acquire include/linux/rcupdate.h:268 [inline]
 rcu_read_lock include/linux/rcupdate.h:688 [inline]
 folio_memcg_lock+0x3a/0x3e0 mm/memcontrol.c:2028
 page_remove_rmap+0x25/0x1480 mm/rmap.c:1348
 zap_pte_range mm/memory.c:1357 [inline]
 zap_pmd_range mm/memory.c:1467 [inline]
 zap_pud_range mm/memory.c:1496 [inline]
 zap_p4d_range mm/memory.c:1517 [inline]
 unmap_page_range+0xf0e/0x29f0 mm/memory.c:1538
 unmap_single_vma+0x198/0x310 mm/memory.c:1583
 unmap_vmas+0x16b/0x2f0 mm/memory.c:1615
 exit_mmap+0x1d0/0x630 mm/mmap.c:3171
 __mmput+0x122/0x4b0 kernel/fork.c:1113
 mmput+0x56/0x60 kernel/fork.c:1134
 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+0x47d/0x21d0 kernel/signal.c:2820
 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: 0033:0x7f0acc4a9ae9
Code: Unable to access opcode bytes at RIP 0x7f0acc4a9abf.
RSP: 002b:00007f0ac9a1f218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f0acc5bcf68 RCX: 00007f0acc4a9ae9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0acc5bcf68
RBP: 00007f0acc5bcf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0acc5bcf6c
R13: 00007ffd2c5af9cf R14: 00007f0ac9a1f300 R15: 0000000000022000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g76097 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=23509
rcu: rcu_preempt kthread starved for 10502 jiffies! g76097 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28696 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4969 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6250
 schedule+0xd2/0x260 kernel/sched/core.c:6323
 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 0 to CPUs 1:
----------------
Code disassembly (best guess):
   0:	75 48                	jne    0x4a
   2:	80 7d 00 00          	cmpb   $0x0,0x0(%rbp)
   6:	74 39                	je     0x41
   8:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
   f:	fc ff df
  12:	48 89 e8             	mov    %rbp,%rax
  15:	48 83 c0 01          	add    $0x1,%rax
  19:	48 89 c2             	mov    %rax,%rdx
  1c:	48 89 c1             	mov    %rax,%rcx
  1f:	48 c1 ea 03          	shr    $0x3,%rdx
  23:	83 e1 07             	and    $0x7,%ecx
  26:	0f b6 14 1a          	movzbl (%rdx,%rbx,1),%edx
* 2a:	38 ca                	cmp    %cl,%dl <-- trapping instruction
  2c:	7f 04                	jg     0x32
  2e:	84 d2                	test   %dl,%dl
  30:	75 1f                	jne    0x51
  32:	80 38 00             	cmpb   $0x0,(%rax)
  35:	75 de                	jne    0x15
  37:	48 83 c4 08          	add    $0x8,%rsp
  3b:	48 29 e8             	sub    %rbp,%rax
  3e:	5b                   	pop    %rbx
  3f:	5d                   	pop    %rbp