rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2679 jiffies s: 359389 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: 30709 Comm: syz.3.18919 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__lock_release kernel/locking/lockdep.c:5316 [inline] RIP: 0010:lock_release+0x17d/0x920 kernel/locking/lockdep.c:5682 Code: 00 00 00 48 8b 84 24 a0 00 00 00 48 89 44 24 50 43 c6 44 2f 08 f8 fa 48 c7 c7 00 1f 8c 8a e8 7a a6 c7 08 65 ff 05 c3 b5 9d 7e 44 24 5c 01 00 00 00 48 c7 c0 e4 f7 1f 8e 48 c1 e8 03 42 0f b6 RSP: 0018:ffffc900001dfee0 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffff88803a798adc RCX: 0bea2d3bdab9f200 RDX: 0000000000000000 RSI: ffffffff8a8c1f00 RDI: ffffffff8adf0c20 RBP: ffffc900001dfff0 R08: ffffffff8e1fc32f R09: 1ffffffff1c3f865 R10: dffffc0000000000 R11: fffffbfff1c3f866 R12: 1ffff9200003bfe8 R13: dffffc0000000000 R14: ffff88803a798000 R15: 1ffff9200003bfe8 FS: 00007f9158b986c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9157de8600 CR3: 000000007bdb1000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000008d24 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __perf_output_begin kernel/events/ring_buffer.c:263 [inline] perf_output_begin_forward+0x7ea/0xa80 kernel/events/ring_buffer.c:272 __perf_event_output kernel/events/core.c:7732 [inline] perf_event_output_forward+0x1ad/0x2f0 kernel/events/core.c:7750 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496 perf_tp_event+0x38c/0xc00 kernel/events/core.c:10029 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10002 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728 RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 30 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc900001e0760 EFLAGS: 00000206 RAX: 0bea2d3bdab9f200 RBX: 1ffff9200003c0f4 RCX: 0bea2d3bdab9f200 RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0c20 RBP: ffffc900001e0860 R08: ffffffff90af3337 R09: 1ffffffff215e666 R10: dffffc0000000000 R11: fffffbfff215e667 R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] ndisc_send_skb+0xd9d/0x14e0 net/ipv6/ndisc.c:521 addrconf_rs_timer+0x2d1/0x630 net/ipv6/addrconf.c:3979 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x53e/0x800 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:schedule_debug kernel/sched/core.c:5803 [inline] RIP: 0010:__schedule+0x141/0x40e0 kernel/sched/core.c:6455 Code: 74 08 48 89 df e8 cf ad 9e f7 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 b6 ad 9e f7 48 81 3b 9d 6e ac 57 <0f> 85 cb 12 00 00 45 85 f6 75 44 49 8d 5c 24 18 48 89 d8 48 c1 e8 RSP: 0018:ffffc90003287840 EFLAGS: 00000246 RAX: 1ffff92000650000 RBX: ffffc90003280000 RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90003287970 RBP: ffffc900032879d0 R08: ffffc9000328796f R09: ffffc90003287960 R10: dffffc0000000000 R11: fffff52000650f2e R12: ffff88803a798000 R13: ffff8880b8f00000 R14: 0000000000000001 R15: dffffc0000000000 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874 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:smp_call_function_single+0x429/0x5a0 kernel/smp.c:792 Code: eb db e8 2a 08 0b 00 bf 01 00 00 00 e8 30 81 e1 ff 65 8b 1d f1 04 8b 7e 31 ff 89 de e8 70 0b 0b 00 85 db 74 65 e8 07 08 0b 00 <43> c7 44 37 04 f8 f8 f8 f8 48 c7 44 24 20 0e 36 e0 45 4b c7 04 37 RSP: 0018:ffffc90003287b40 EFLAGS: 00000246 RAX: ffffffff81776ace RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc9000ef9b000 RSI: 0000000000001502 RDI: 0000000000001503 RBP: ffffc90003287c30 R08: ffffffff90af333f R09: 1ffffffff215e667 R10: dffffc0000000000 R11: fffffbfff215e668 R12: 0000000000000000 R13: 1ffff92000650f71 R14: dffffc0000000000 R15: 1ffff92000650f6c task_function_call kernel/events/core.c:120 [inline] perf_install_in_context+0x5c7/0x920 kernel/events/core.c:2941 __do_sys_perf_event_open kernel/events/core.c:12784 [inline] __se_sys_perf_event_open+0x1287/0x1ec0 kernel/events/core.c:12378 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9157d9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9158b98028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f9158016090 RCX: 00007f9157d9aeb9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000bc0 RBP: 00007f9157e08c1f R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9158016128 R14: 00007f9158016090 R15: 00007ffe82139508