rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2681 jiffies s: 42769 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: 12659 Comm: syz.1.2509 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:-1 Code: 83 3e 00 75 20 43 0f b6 04 3c 84 c0 75 3a 8b 03 3d 00 00 00 40 73 0a 5b 41 5c 41 5d 41 5e 41 5f c3 0f 0b eb f2 e8 58 00 00 00 d9 89 d9 80 e1 07 80 c1 03 38 c1 7c ac 49 89 fe 48 89 df e8 df RSP: 0018:ffffc900001e0030 EFLAGS: 00000046 RAX: fa4354a72ddb0f00 RBX: ffff88801934043c RCX: ffff888019340000 RDX: 0000000000000100 RSI: 0000000000000304 RDI: 0000000000000000 RBP: ffffc900001e0158 R08: ffffc900001dfe47 R09: 1ffff9200003bfc8 R10: dffffc0000000000 R11: fffff5200003bfc9 R12: 1ffff11003268087 R13: 1ffff9200003c018 R14: ffff888019340440 R15: dffffc0000000000 FS: 00007fc1fb1f66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f35b0fed158 CR3: 000000003fbf1000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_read_unlock include/linux/rcupdate.h:823 [inline] trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027 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 a2 7c 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:ffffc900001e0380 EFLAGS: 00000206 RAX: fa4354a72ddb0f00 RBX: 1ffff9200003c078 RCX: fa4354a72ddb0f00 RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0 RBP: ffffc900001e0480 R08: ffffffff90b102cf R09: 1ffffffff2162059 R10: dffffc0000000000 R11: fffffbfff216205a R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] ip6_dst_lookup_tail+0x1010/0x1600 net/ipv6/ip6_output.c:1140 icmpv6_route_lookup+0xfe/0x5a0 net/ipv6/icmp.c:366 icmp6_send+0x1091/0x1a60 net/ipv6/icmp.c:603 __icmpv6_send include/linux/icmpv6.h:28 [inline] icmpv6_send include/linux/icmpv6.h:49 [inline] ip6_link_failure+0x37/0x4c0 net/ipv6/route.c:2831 dst_link_failure include/net/dst.h:423 [inline] ndisc_error_report+0x10e/0x160 net/ipv6/ndisc.c:733 neigh_invalidate+0x23b/0x460 net/core/neighbour.c:1064 neigh_timer_handler+0x929/0x1090 net/core/neighbour.c:1151 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_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:__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 3f 89 1e f7 65 8b 05 b0 3a c8 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc90010257ae0 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: fa4354a72ddb0f00 RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: 0000000000000001 RBP: ffffc90010257b70 R08: ffff8880b8f3580b R09: 1ffff110171e6b01 R10: dffffc0000000000 R11: ffffed10171e6b02 R12: dffffc0000000000 R13: ffff8880b8f3ba58 R14: ffff88802b2a6400 R15: 1ffff9200204af5c try_to_wake_up+0x660/0x10b0 kernel/sched/core.c:4230 wake_up_process kernel/sched/core.c:4362 [inline] wake_up_q+0x78/0xc0 kernel/sched/core.c:1010 futex_wake+0x426/0x4f0 kernel/futex/waitwake.c:184 do_futex+0x2e2/0x320 kernel/futex/syscalls.c:139 __do_sys_futex kernel/futex/syscalls.c:211 [inline] __se_sys_futex+0x381/0x410 kernel/futex/syscalls.c:192 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: 0033:0x7fc1fcf9e0d9 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:00007fc1fb1f60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fc1fd225fa8 RCX: 00007fc1fcf9e0d9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc1fd225fac RBP: 00007fc1fd225fa0 R08: 001d8f02f2e64d40 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc1fd226038 R14: 00007fff79747450 R15: 00007fff79747538