rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=9c9/1/0x4000000000000000 softirq=268244/268248 fqs=5213 
	(t=10502 jiffies g=481705 q=1389)
NMI backtrace for cpu 1
CPU: 1 PID: 31691 Comm: syz-executor.4 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:htab_lock_bucket kernel/bpf/hashtab.c:168 [inline]
RIP: 0010:htab_lru_map_update_elem+0x212/0x8c0 kernel/bpf/hashtab.c:1157
Code: b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 dd 05 00 00 4a 8b 94 f3 e8 02 00 00 31 ff b8 01 00 00 00 65 0f c1 02 <89> c6 89 44 24 10 e8 53 99 ea ff 8b 44 24 10 85 c0 0f 85 c9 03 00
RSP: 0018:ffffc900039c7ac8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff888036d17000 RCX: ffffc90013897000
RDX: 0000607f46032548 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff888018b4e040 R08: 0000000000000001 R09: ffff888018b4e07f
R10: ffffed1003169c0f R11: 0000000000000000 R12: 000000005d149c32
R13: ffff88804244fb40 R14: 0000000000000002 R15: ffff888036d13090
 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+0x2751/0x5f00 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: 0033:0x7fd7a26acae9
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:00007fd79fc01188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd7a27c0020 RCX: 00007fd7a26acae9
RDX: 0000000000000038 RSI: 0000000020000100 RDI: 000000000000001a
RBP: 00007fd7a2706f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffed7249c4f R14: 00007fd79fc01300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	(bad)
   8:	df 48 c1             	fisttps -0x3f(%rax)
   b:	ea                   	(bad)
   c:	03 80 3c 02 00 0f    	add    0xf00023c(%rax),%eax
  12:	85 dd                	test   %ebx,%ebp
  14:	05 00 00 4a 8b       	add    $0x8b4a0000,%eax
  19:	94                   	xchg   %eax,%esp
  1a:	f3 e8 02 00 00 31    	repz callq 0x31000022
  20:	ff                   	(bad)
  21:	b8 01 00 00 00       	mov    $0x1,%eax
  26:	65 0f c1 02          	xadd   %eax,%gs:(%rdx)
* 2a:	89 c6                	mov    %eax,%esi <-- trapping instruction
  2c:	89 44 24 10          	mov    %eax,0x10(%rsp)
  30:	e8 53 99 ea ff       	callq  0xffea9988
  35:	8b 44 24 10          	mov    0x10(%rsp),%eax
  39:	85 c0                	test   %eax,%eax
  3b:	0f                   	.byte 0xf
  3c:	85 c9                	test   %ecx,%ecx
  3e:	03 00                	add    (%rax),%eax