rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2661 jiffies s: 19345 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 17186 Comm: syz.1.5863 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2a/0x60 kernel/kcov.c:216
Code: 48 8b 04 24 65 48 8b 0d 44 a0 81 7e 65 8b 15 45 a0 81 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 <74> 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b
RSP: 0018:ffffc900001e0550 EFLAGS: 00000046
RAX: ffffffff81a39a1d RBX: ffff888023cb5a00 RCX: ffff888055f95940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff888023cb5a00
RBP: ffffc900001e0828 R08: dffffc0000000000 R09: ffffed100abf2b29
R10: ffffed100abf2b29 R11: 1ffff1100abf2b28 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880b8f355a0 R15: dffffc0000000000
FS:  00007fb983bb36c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 000000005acbe000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __perf_event_overflow+0x2d/0x610 kernel/events/core.c:9434
 perf_tp_event+0x335/0xb60 kernel/events/core.c:10029
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10002
 perf_trace_preemptirq_template+0x287/0x330 include/trace/events/preemptirq.h:14
 trace_irq_disable include/trace/events/preemptirq.h:36 [inline]
 trace_hardirqs_off_finish+0x13f/0x180 kernel/trace/trace_preemptirq.c:67
 irqentry_enter+0x33/0x50 kernel/entry/common.c:382
 sysvec_irq_work+0xa/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:get_random_u32_below include/linux/random.h:87 [inline]
RIP: 0010:prandom_u32_max include/linux/prandom.h:29 [inline]
RIP: 0010:rfc3315_s14_backoff_update+0x16/0xc0 net/ipv6/addrconf.c:115
Code: fb e9 96 fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 41 57 41 56 53 89 f3 89 fd e8 31 86 a2 f8 e8 ac ce 9b fb 89 c0 <48> 69 c8 41 0d 03 00 81 f9 9d 39 02 00 77 07 e8 16 86 a2 f8 eb e3
RSP: 0018:ffffc900001e0a78 EFLAGS: 00000246
RAX: 00000000852d437e RBX: 0000000000057e40 RCX: 0ce334dad8d59800
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000006a8 R08: dffffc0000000000 R09: fffffbfff215c45a
R10: fffffbfff215c45a R11: 1ffffffff215c459 R12: ffff888055a77750
R13: dffffc0000000000 R14: ffff888055a77604 R15: 1ffff1100ab4eeea
 addrconf_rs_timer+0x2ff/0x600 net/ipv6/addrconf.c:3985
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x9d/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:preempt_schedule_irq+0xac/0x150 kernel/sched/core.c:6873
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 70 bf 01 00 00 00 e8 af 7f 37 f7 e8 0a f6 66 f7 fb bf 01 00 00 00 <e8> df b9 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90003af7da0 EFLAGS: 00000286
RAX: 0ce334dad8d59800 RBX: 0000000000000000 RCX: 0ce334dad8d59800
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: 0000000000000001
RBP: ffffc90003af7e50 R08: ffffffff8f9f7048 R09: ffffffff8f9f7058
R10: ffffffff8f9f7050 R11: ffffffff8f9f7043 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200075efb4
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:syscall_exit_to_user_mode+0x0/0x40 kernel/entry/common.c:301
Code: d6 22 4b f7 66 90 e8 5f da ff ff 48 8b 3c 24 e9 d6 f8 ff ff bf 02 00 00 00 e8 ec 0a 00 00 eb e6 66 2e 0f 1f 84 00 00 00 00 00 <53> 48 89 fb e8 37 3d 56 f7 e8 f2 3d 56 f7 48 89 df e8 ea 38 56 f7
RSP: 0018:ffffc90003af7f18 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc90003af7f20 RCX: 0ce334dad8d59800
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90003af7f58
RBP: ffffc90003af7f48 R08: dffffc0000000000 R09: ffffed100e9f63be
R10: ffffed100e9f63be R11: 1ffff1100e9f63bd R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003af7f58 R15: 00000000000000ca
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb982d8eec9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb983bb30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fb982fe5fa8 RCX: 00007fb982d8eec9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb982fe5fac
RBP: 00007fb982fe5fa0 R08: 00015e7f2c3afbb0 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb982fe6038 R14: 00007fff50f9aec0 R15: 00007fff50f9afa8
 </TASK>