rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 6230 jiffies s: 7709 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: 6004 Comm: syz.5.485 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x84/0x290 mm/kasan/generic.c:189 Code: 49 c1 e9 03 4b 8d 1c 21 49 89 df 4d 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 41 80 3b 00 <0f> 85 86 01 00 00 49 ff c3 48 ff c3 75 ee e9 18 01 00 00 44 89 dd RSP: 0018:ffffc900001df710 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff8163fef5 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90b10240 RBP: ffffc900001df970 R08: ffffffff90b10247 R09: 1ffffffff2162048 R10: dffffc0000000000 R11: fffffbfff2162048 R12: dffffc0000000001 R13: ffff888052f8da00 R14: 1ffffffff2162048 R15: 0000000000000001 FS: 00007fe10dc996c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3051aff8 CR3: 000000007772b000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: instrument_atomic_read include/linux/instrumented.h:72 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] hlock_class kernel/locking/lockdep.c:228 [inline] check_wait_context kernel/locking/lockdep.c:4729 [inline] __lock_acquire+0x5f5/0x7c40 kernel/locking/lockdep.c:5013 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 rcu_lock_acquire include/linux/rcupdate.h:350 [inline] rcu_read_lock include/linux/rcupdate.h:791 [inline] __perf_output_begin kernel/events/ring_buffer.c:163 [inline] perf_output_begin_forward+0xc3/0xa70 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+0x457/0x630 kernel/events/core.c:9496 perf_event_overflow kernel/events/core.c:9517 [inline] perf_swevent_hrtimer+0x472/0x630 kernel/events/core.c:10967 __run_hrtimer kernel/time/hrtimer.c:1751 [inline] __hrtimer_run_queues+0x4e7/0xc90 kernel/time/hrtimer.c:1815 hrtimer_interrupt+0x399/0x980 kernel/time/hrtimer.c:1877 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194 Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 4f 57 1e f7 65 8b 05 50 08 c8 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc900001e0340 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 7d5262c12664d300 RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: 0000000000000001 RBP: ffffc900001e03c0 R08: ffffffff90b10337 R09: 1ffffffff2162066 R10: dffffc0000000000 R11: fffffbfff2162067 R12: dffffc0000000000 R13: ffff8880590d9730 R14: ffffffff96f3bf50 R15: 1ffff9200003c068 __debug_check_no_obj_freed lib/debugobjects.c:1037 [inline] debug_check_no_obj_freed+0x471/0x520 lib/debugobjects.c:1058 slab_free_hook mm/slub.c:1704 [inline] slab_free_freelist_hook+0xd2/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] kmem_cache_free+0xf7/0x2a0 mm/slub.c:3709 kfree_skb_list_reason+0x43/0x70 net/core/skbuff.c:903 __dev_xmit_skb net/core/dev.c:4001 [inline] __dev_queue_xmit+0x2158/0x3810 net/core/dev.c:4337 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_hh_output include/net/neighbour.h:529 [inline] neigh_output include/net/neighbour.h:543 [inline] ip6_finish_output2+0xd8f/0x15c0 net/ipv6/ip6_output.c:138 dst_output include/net/dst.h:453 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xc04/0x1520 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x367/0x640 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+0x56c/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x291/0x910 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:__sanitizer_cov_trace_pc+0x41/0x60 kernel/kcov.c:221 Code: 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 32 <48> 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 RSP: 0018:ffffc90003847718 EFLAGS: 00000246 RAX: ffffffff84145042 RBX: ffff8880b8e3be00 RCX: ffff888052f8da00 RDX: ffffc9001af13000 RSI: 000000000000381f RDI: ffff8880b8e43200 RBP: ffffc900038477d0 R08: ffff8880b8f3bdd7 R09: ffff8880b8f3bdd0 R10: dffffc0000000000 R11: ffffed10171e77bb R12: 1ffff92000708ee8 R13: dffffc0000000000 R14: ffff8880b8e43200 R15: ffff8880b8e43200 llist_add_batch+0x72/0x180 lib/llist.c:28 llist_add include/linux/llist.h:221 [inline] smp_call_function_many_cond+0x769/0x1250 kernel/smp.c:959 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1165 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1574 [inline] text_poke_bp_batch+0x5ae/0x850 arch/x86/kernel/alternative.c:1836 text_poke_flush arch/x86/kernel/alternative.c:1965 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1972 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x11f/0x240 kernel/jump_label.c:207 static_key_enable+0x16/0x20 kernel/jump_label.c:220 tracepoint_add_func+0x985/0xa10 kernel/tracepoint.c:363 tracepoint_probe_register_prio kernel/tracepoint.c:513 [inline] tracepoint_probe_register+0x5a/0x90 kernel/tracepoint.c:533 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x41e/0x940 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x234/0x2d0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x89/0x110 kernel/events/core.c:10119 perf_try_init_event+0x12b/0x3d0 kernel/events/core.c:11634 perf_init_event kernel/events/core.c:11698 [inline] perf_event_alloc+0xea0/0x21e0 kernel/events/core.c:11990 __do_sys_perf_event_open kernel/events/core.c:12526 [inline] __se_sys_perf_event_open+0x701/0x1ec0 kernel/events/core.c:12418 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: 0033:0x7fe10cd9de59 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:00007fe10dc99028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fe10d025fa0 RCX: 00007fe10cd9de59 RDX: 0000000100000000 RSI: 0000000000000000 RDI: 0000200000000100 RBP: 00007fe10ce33e6f R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe10d026038 R14: 00007fe10d025fa0 R15: 00007ffec1e1e698