rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (9876 ticks this GP) idle=bdcc/1/0x4000000000000000 softirq=34577/34577 fqs=3729 rcu: hardirqs softirqs csw/system rcu: number: 1255600 0 0 rcu: cputime: 16279 36210 64 ==> 52490(ms) rcu: (t=10500 jiffies g=51433 q=1058 ncpus=2) CPU: 0 PID: 9282 Comm: syz.0.1095 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x82/0x90 kernel/kcov.c:315 Code: 8d 52 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 05 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 48 8b 04 24 RSP: 0018:ffffc90000006ad0 EFLAGS: 00000246 RAX: ffffffff813b4520 RBX: ffffc90000000000 RCX: 0000000000000100 RDX: ffff88807dcd0000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000002 R08: ffff88807dcd0000 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000100 R12: 1ffff92000000d76 R13: 1ffff92000000d77 R14: ffffc900000078f8 R15: ffffc90000008000 FS: 00007f83192e86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559c1a1454b0 CR3: 000000005df7e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_stack arch/x86/include/asm/stacktrace.h:58 [inline] stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline] deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline] unwind_next_frame+0xf00/0x2970 arch/x86/kernel/unwind_orc.c:585 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 __call_rcu_common kernel/rcu/tree.c:2721 [inline] call_rcu+0x153/0x950 kernel/rcu/tree.c:2837 refdst_drop include/net/dst.h:270 [inline] skb_dst_drop include/net/dst.h:282 [inline] __dev_queue_xmit+0x983/0x36b0 net/core/dev.c:4419 dev_queue_xmit_accel include/linux/netdevice.h:3119 [inline] macvlan_queue_xmit drivers/net/macvlan.c:562 [inline] macvlan_start_xmit+0x2ff/0x670 drivers/net/macvlan.c:586 __netdev_start_xmit include/linux/netdevice.h:4943 [inline] netdev_start_xmit include/linux/netdevice.h:4957 [inline] xmit_one net/core/dev.c:3658 [inline] dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3674 sch_direct_xmit+0x25e/0x4c0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3895 [inline] __dev_queue_xmit+0x179c/0x36b0 net/core/dev.c:4430 neigh_output include/net/neighbour.h:543 [inline] ip6_finish_output2+0xe3d/0x1630 net/ipv6/ip6_output.c:141 dst_output include/net/dst.h:467 [inline] NF_HOOK include/linux/netfilter.h:304 [inline] ndisc_send_skb+0xc26/0x14f0 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x542/0x800 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+0xd3/0x190 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:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010 Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 11 fc cf f6 e8 1c 03 01 f7 fb bf 01 00 00 00 f1 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f RSP: 0018:ffffc9000470f880 EFLAGS: 00000282 RAX: 678e695fa57bce00 RBX: 0000000000000000 RCX: 678e695fa57bce00 RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: 0000000000000001 RBP: ffffc9000470f920 R08: ffffffff911bf5ff R09: 1ffffffff2237ebf R10: dffffc0000000000 R11: fffffbfff2237ec0 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920008e1f10 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:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:239 [inline] RIP: 0010:tif_need_resched include/linux/thread_info.h:184 [inline] RIP: 0010:need_resched include/linux/sched.h:2260 [inline] RIP: 0010:preempt_schedule_common+0xa4/0xc0 kernel/sched/core.c:6875 Code: 00 00 00 e8 fe b6 ff ff 65 8b 05 7f 36 77 75 65 ff 0d 78 36 77 75 65 48 8b 1d 68 36 77 75 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <0f> 84 67 ff ff ff 48 89 df e8 8e bc 52 f7 e9 5a ff ff ff 5b 41 5e RSP: 0018:ffffc9000470f9e0 EFLAGS: 00000246 RAX: 1ffff1100fb9a000 RBX: ffff88807dcd0000 RCX: ffffffff815d61a6 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807f222600 RBP: ffffc9000470fa78 R08: ffff88807f222603 R09: 1ffff1100fe444c0 R10: dffffc0000000000 R11: ffffed100fe444c1 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88807dcd14c8 R15: dffffc0000000000 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45 smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652 task_function_call kernel/events/core.c:120 [inline] perf_install_in_context+0x5be/0x920 kernel/events/core.c:2948 __do_sys_perf_event_open kernel/events/core.c:12915 [inline] __se_sys_perf_event_open+0x1836/0x1c50 kernel/events/core.c:12567 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f831839aeb9 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:00007f83192e8028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f8318615fa0 RCX: 00007f831839aeb9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000080 RBP: 00007f8318408c1f R08: 0000000000000002 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8318616038 R14: 00007f8318615fa0 R15: 00007ffe62806728