rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-....: (1 GPs behind) idle=c83/1/0x4000000000000002 softirq=273997/273998 fqs=5228 
	(detected by 0, t=10502 jiffies, g=479549, q=1479)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 28649 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:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2d/0x60 kernel/kcov.c:200
Code: 89 a9 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 a4 15 00 00 <85> c0 74 2b 8b 82 80 15 00 00 83 f8 02 75 20 48 8b 8a 88 15 00 00
RSP: 0018:ffffc90000dc0878 EFLAGS: 00000006
RAX: 0000000000000000 RBX: ffffe8ffffd32420 RCX: 0000000000000100
RDX: ffff8880227a8000 RSI: ffffffff817fa723 RDI: 0000000000000003
RBP: 0000000000000014 R08: 0000000000002000 R09: ffff8880b9d3aa53
R10: ffffffff817fa712 R11: 0000000000000000 R12: ffffc90000dc0900
R13: ffffc90000dc0910 R14: ffffffff89400d42 R15: ffffc90000dc0950
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000880 CR3: 000000000b68e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 perf_trace_buf_alloc+0x33/0x260 kernel/trace/trace_event_perf.c:407
 perf_trace_preemptirq_template+0x128/0x460 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle include/trace/events/preemptirq.h:40 [inline]
 trace_irq_enable_rcuidle include/trace/events/preemptirq.h:40 [inline]
 trace_hardirqs_on+0x156/0x1c0 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:664
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__rcu_read_unlock+0xc4/0x570 kernel/rcu/tree_plugin.h:425
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e b6 01 00 00 8b 85 40 04 00 00 85 c0 75 54 <65> 48 8b 1c 25 40 70 02 00 48 8d bb 3c 04 00 00 48 b8 00 00 00 00
RSP: 0018:ffffc90000dc0a50 EFLAGS: 00000206
RAX: 0000000000000006 RBX: ffff8880b9d3a900 RCX: 1ffffffff1fb4c8e
RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000000
RBP: ffffffff8b98c780 R08: 0000000000000001 R09: ffffffff8fd5dac7
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: ffff88801ed3ec00 R14: 0000000000000200 R15: ffff88807c5c8000
 rcu_read_unlock include/linux/rcupdate.h:720 [inline]
 ndisc_send_skb+0xd50/0x17f0 net/ipv6/ndisc.c:516
 ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:702
 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3898
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 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:4849
Code: 63 ea e9 07 85 c0 75 02 0f 0b 48 85 db 0f 85 25 01 00 00 4c 89 f7 e8 fc f7 ff ff e8 f7 43 2d 00 fb 65 48 8b 1c 25 40 70 02 00 <48> 8d bb 80 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90000e1f5f8 EFLAGS: 00000202
RAX: 0000000000001525 RBX: ffff8880227a8000 RCX: 1ffffffff1ae1711
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000e1f640 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817e0ba2 R11: 0000000000000000 R12: ffff8880b9d3a7d8
R13: ffff88807a455700 R14: ffff8880b9d39a80 R15: ffff8880b9d3a4b8
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xaa2/0x4940 kernel/sched/core.c:6250
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6416
 __cond_resched+0x13/0x20 kernel/sched/core.c:8129
 _cond_resched include/linux/sched.h:2017 [inline]
 zap_pte_range mm/memory.c:1422 [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+0x10bb/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:3170
 __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/0x2220 kernel/signal.c:2830
 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: 0033:0x7f944bd9fae9
Code: Unable to access opcode bytes at RIP 0x7f944bd9fabf.
RSP: 002b:00007f94492d3218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f944beb30e8 RCX: 00007f944bd9fae9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f944beb30ec
RBP: 00007f944beb30e0 R08: 0000000000000016 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f944beb30ec
R13: 00007ffe839924ff R14: 00007f94492d3300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 a9 8a 7e 89 c1    	mov    %ebp,-0x3e768176(%rcx)
   6:	48 8b 34 24          	mov    (%rsp),%rsi
   a:	81 e1 00 01 00 00    	and    $0x100,%ecx
  10:	65 48 8b 14 25 40 70 	mov    %gs:0x27040,%rdx
  17:	02 00
  19:	a9 00 01 ff 00       	test   $0xff0100,%eax
  1e:	74 0e                	je     0x2e
  20:	85 c9                	test   %ecx,%ecx
  22:	74 35                	je     0x59
  24:	8b 82 a4 15 00 00    	mov    0x15a4(%rdx),%eax
* 2a:	85 c0                	test   %eax,%eax <-- trapping instruction
  2c:	74 2b                	je     0x59
  2e:	8b 82 80 15 00 00    	mov    0x1580(%rdx),%eax
  34:	83 f8 02             	cmp    $0x2,%eax
  37:	75 20                	jne    0x59
  39:	48 8b 8a 88 15 00 00 	mov    0x1588(%rdx),%rcx