rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2651 jiffies s: 953 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: 4388 Comm: syz.4.9 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:check_preemption_disabled+0x26/0x110 lib/smp_processor_id.c:16 Code: df 8a eb 00 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 05 51 ff d4 75 65 8b 0d f2 54 d5 75 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 08 RSP: 0018:ffffc900001e0048 EFLAGS: 00000086 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000010102 RDX: 0000000000000000 RSI: ffffffff8a8c23a0 RDI: ffffffff8adf0f60 RBP: ffffc900001e0188 R08: dffffc0000000000 R09: 1ffffffff215ec49 R10: dffffc0000000000 R11: fffffbfff215ec4a R12: 0000000000000001 R13: 1ffff9200003c01c R14: 0000000000000046 R15: dffffc0000000000 FS: 00007f51f5c286c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fb1bff8 CR3: 0000000072bac000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline] lock_acquire+0x1cb/0x4a0 kernel/locking/lockdep.c:5664 seqcount_lockdep_reader_access+0xcd/0x1d0 include/linux/seqlock.h:102 timekeeping_get_delta kernel/time/timekeeping.c:254 [inline] timekeeping_get_ns kernel/time/timekeeping.c:388 [inline] ktime_get+0x7b/0x270 kernel/time/timekeeping.c:848 clockevents_program_event+0xe2/0x310 kernel/time/clockevents.c:326 hrtimer_interrupt+0x59d/0x9c0 kernel/time/hrtimer.c:1886 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:perf_trace_buf_alloc+0x1d4/0x300 kernel/trace/trace_event_perf.c:423 Code: 00 74 08 4c 89 f7 e8 8b d2 48 00 4c 89 f8 49 03 06 48 63 cb 48 8d 5c 01 f8 4c 8d 74 01 ff 48 89 d9 48 c1 e9 03 42 0f b6 0c 29 <84> c9 0f 85 9f 00 00 00 4c 89 f1 48 c1 e9 03 42 0f b6 0c 29 84 c9 RSP: 0018:ffffc900001e0500 EFLAGS: 00000a03 RAX: ffffe8ffffd86000 RBX: ffffe8ffffd86024 RCX: 0000000000000000 RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000008 RBP: 0000000000000001 R08: ffffffff8e1fd76f R09: 1ffffffff1c3faed R10: dffffc0000000000 R11: fffffbfff1c3faee R12: ffffffff8c650988 R13: dffffc0000000000 R14: ffffe8ffffd8602b R15: 0000607f46e86000 perf_trace_lock+0x197/0x390 include/trace/events/lock.h:50 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x8ad/0x920 kernel/locking/lockdep.c:5673 rcu_lock_release include/linux/rcupdate.h:355 [inline] rcu_read_unlock include/linux/rcupdate.h:824 [inline] ip6_finish_output2+0xea3/0x15d0 net/ipv6/ip6_output.c:139 dst_output include/net/dst.h:453 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xbf1/0x14e0 net/ipv6/ndisc.c:513 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_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x9d/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728 RIP: 0010:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6874 Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 f5 42 23 f7 e8 b0 35 53 f7 fb bf 01 00 00 00 75 b9 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f RSP: 0018:ffffc90004567860 EFLAGS: 00000286 RAX: c2c4eb6cceefe200 RBX: 0000000000000000 RCX: c2c4eb6cceefe200 RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: 0000000000000001 RBP: ffffc90004567910 R08: ffffffff8fa0b048 R09: ffffffff8fa0b058 R10: ffffffff8fa0b050 R11: ffffffff8fa0b043 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920008acf0c 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:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:50 Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 90 90 90 90 90 90 90 b9 00 10 00 00 31 c0 aa c3 90 90 90 90 90 90 89 c8 48 c1 e9 03 74 18 0f 1f 84 00 00 RSP: 0018:ffffc900045679d8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000180 RDX: ffff8880292fe000 RSI: 0000000000000001 RDI: ffff8880292fee80 RBP: 0000000000506dc0 R08: ffffea0000a4bfb7 R09: ffffed100525fc00 R10: dffffc0000000000 R11: fffff940001497f7 R12: 0000000000000001 R13: 0000000000000000 R14: ffffea0000a4bf80 R15: 0000000000000001 clear_page arch/x86/include/asm/page_64.h:58 [inline] clear_highpage include/linux/highmem.h:242 [inline] clear_highpage_kasan_tagged include/linux/highmem.h:252 [inline] kernel_init_pages mm/page_alloc.c:1408 [inline] post_alloc_hook+0x12c/0x1a0 mm/page_alloc.c:2554 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657 __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_pages_node include/linux/gfp.h:260 [inline] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:132 [inline] bpf_ringbuf_alloc+0x251/0x560 kernel/bpf/ringbuf.c:169 ringbuf_map_alloc+0x1ac/0x2d0 kernel/bpf/ringbuf.c:210 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x534/0x1000 kernel/bpf/syscall.c:1149 __sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5012 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 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: 0033:0x7f51f4d9c799 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:00007f51f5c28028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f51f5015fa0 RCX: 00007f51f4d9c799 RDX: 0000000000000050 RSI: 0000200000000180 RDI: 0000000000000000 RBP: 00007f51f4e32c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f51f5016038 R14: 00007f51f5015fa0 R15: 00007ffe38156d58