rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=507/1/0x4000000000000000 softirq=274262/274262 fqs=5241 
	(t=10502 jiffies g=454257 q=666)
NMI backtrace for cpu 1
CPU: 1 PID: 28115 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __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:memcpy_erms+0x8/0x10 arch/x86/lib/memcpy_64.S:56
Code: cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4 <c3> 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c 35
RSP: 0018:ffffc9000462fa50 EFLAGS: 00000202
RAX: ffff88807591d4b0 RBX: ffff88807591d4b0 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffff88807d99225f RDI: ffff88807591d4b7
RBP: ffff88804e6ea000 R08: 0000000000000001 R09: ffff88807591d4b6
R10: ffffed100eb23a96 R11: 0000000000000000 R12: ffff88807d992258
R13: ffff88807591d480 R14: 0000000000000007 R15: ffff88804e6ed9b0
 memcpy include/linux/fortify-string.h:225 [inline]
 prealloc_lru_pop+0x80/0x1c0 kernel/bpf/hashtab.c:297
 htab_lru_map_update_elem+0x15a/0x8c0 kernel/bpf/hashtab.c:1151
 bpf_map_update_value.isra.0+0x2e8/0x910 kernel/bpf/syscall.c:207
 generic_map_update_batch+0x3f2/0x5b0 kernel/bpf/syscall.c:1396
 bpf_map_do_batch+0x3d5/0x510 kernel/bpf/syscall.c:4207
 __sys_bpf+0x2761/0x5f10 kernel/bpf/syscall.c:4682
 __do_sys_bpf kernel/bpf/syscall.c:4722 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4720 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4720
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f18defe7af9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f18ddf5d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f18df0faf60 RCX: 00007f18defe7af9
RDX: 0000000000000038 RSI: 0000000020000480 RDI: 000000000000001a
RBP: 00007f18df041ff7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdd9cd67cf R14: 00007f18ddf5d300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	cc                   	int3
   1:	cc                   	int3
   2:	eb 1e                	jmp    0x22
   4:	0f 1f 00             	nopl   (%rax)
   7:	48 89 f8             	mov    %rdi,%rax
   a:	48 89 d1             	mov    %rdx,%rcx
   d:	48 c1 e9 03          	shr    $0x3,%rcx
  11:	83 e2 07             	and    $0x7,%edx
  14:	f3 48 a5             	rep movsq %ds:(%rsi),%es:(%rdi)
  17:	89 d1                	mov    %edx,%ecx
  19:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi)
  1b:	c3                   	retq
  1c:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
  22:	48 89 f8             	mov    %rdi,%rax
  25:	48 89 d1             	mov    %rdx,%rcx
  28:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi)
* 2a:	c3                   	retq <-- trapping instruction
  2b:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  32:	48 89 f8             	mov    %rdi,%rax
  35:	48 83 fa 20          	cmp    $0x20,%rdx
  39:	72 7e                	jb     0xb9
  3b:	40 38 fe             	cmp    %dil,%sil
  3e:	7c 35                	jl     0x75