rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10500 ticks this GP) idle=aa64/1/0x4000000000000000 softirq=49410/49410 fqs=4551 rcu: hardirqs softirqs csw/system rcu: number: 1451734 0 0 rcu: cputime: 16946 35533 35 ==> 52510(ms) rcu: (t=10503 jiffies g=51965 q=1168 ncpus=2) CPU: 1 PID: 9674 Comm: syz.1.855 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212 Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 9c 92 c4 0c 48 89 de 5b e9 43 9d 56 00 cc cc cc 0f 1e fa 48 8b 04 24 65 48 8b 0d f0 24 7e 7e 65 8b 15 f1 24 7e RSP: 0018:ffffc900001f03d0 EFLAGS: 00000287 RAX: ffffffff885cf3e1 RBX: 0000000000000000 RCX: 0000000000000100 RDX: ffff88802495da00 RSI: 0000000000000180 RDI: 000000000000001c RBP: 000000000000001c R08: 000000000000000c R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100c9e2b75 R12: 0000000000000180 R13: 000000000000001c R14: ffff88805d7cb8c0 R15: ffff888064f15a00 FS: 00007f928ca906c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000023c0 CR3: 0000000068909000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: skb_tail_pointer include/linux/skbuff.h:2530 [inline] skb_put+0x11b/0x210 net/core/skbuff.c:2437 __nlmsg_put+0x44/0x1a0 net/netlink/af_netlink.c:2146 nlmsg_put include/net/netlink.h:956 [inline] neigh_fill_info+0x1c2/0xbd0 net/core/neighbour.c:2578 __neigh_notify+0x17d/0x300 net/core/neighbour.c:3528 neigh_cleanup_and_release+0xa0/0x260 net/core/neighbour.c:102 neigh_del net/core/neighbour.c:226 [inline] neigh_remove_one+0x5f1/0x700 net/core/neighbour.c:247 neigh_forced_gc net/core/neighbour.c:280 [inline] neigh_alloc net/core/neighbour.c:486 [inline] ___neigh_create+0x467/0x2440 net/core/neighbour.c:649 ip6_finish_output2+0x159e/0x1650 net/ipv6/ip6_output.c:132 dst_output include/net/dst.h:467 [inline] NF_HOOK include/linux/netfilter.h:304 [inline] ndisc_send_skb+0xbed/0x14b0 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x2bc/0x600 net/ipv6/addrconf.c:4006 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x52d/0x7d0 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:finish_task_switch+0x26a/0x920 kernel/sched/core.c:5254 Code: 0f 84 37 01 00 00 48 85 db 0f 85 56 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 80 ca 14 09 e8 4b a4 2f 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc900039b7738 EFLAGS: 00000282 RAX: c81d8619ff167000 RBX: 0000000000000000 RCX: c81d8619ff167000 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc6f80 RBP: ffffc900039b7790 R08: ffffffff90d94607 R09: 1ffffffff21b28c0 R10: dffffc0000000000 R11: fffffbfff21b28c1 R12: ffff88802495da00 R13: dffffc0000000000 R14: ffff88802d529e00 R15: ffff8880b8f3cac8 context_switch kernel/sched/core.c:5383 [inline] __schedule+0x14da/0x44d0 kernel/sched/core.c:6699 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:kasan_check_range+0x1c4/0x290 mm/kasan/generic.c:-1 Code: 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 12 41 80 3b 00 0f 85 a6 00 00 00 49 ff c3 49 ff cc 75 ee 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 45 84 ff 75 61 41 f7 c7 00 ff 00 00 75 5d 41 f7 c7 00 RSP: 0018:ffffc900039b7b08 EFLAGS: 00000256 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81677b7b RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e4a2128 RBP: ffffc900039b7c30 R08: ffffffff8e4a212f R09: 1ffffffff1c94425 R10: dffffc0000000000 R11: fffffbfff1c94426 R12: ffffffff81ad331c R13: dffffc0000000000 R14: ffff8880273f1840 R15: 1ffffffff1c94425 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] cpumask_test_cpu include/linux/cpumask.h:504 [inline] cpu_online include/linux/cpumask.h:1082 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0xab/0x8b0 kernel/locking/lockdep.c:5765 __mutex_unlock_slowpath+0xb7/0x6a0 kernel/locking/mutex.c:907 __do_sys_perf_event_open kernel/events/core.c:12918 [inline] __se_sys_perf_event_open+0x180c/0x1c20 kernel/events/core.c:12567 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f928bb8f749 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:00007f928ca90038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f928bde5fa0 RCX: 00007f928bb8f749 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140 RBP: 00007f928bc13f91 R08: 0000000000000002 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f928bde6038 R14: 00007f928bde5fa0 R15: 00007ffc41d5a278