rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (14 ticks this GP) idle=797/1/0x4000000000000000 softirq=18800/18801 fqs=2100 (detected by 1, t=10505 jiffies, g=25761, q=928) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8269 Comm: syz.1.1147 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:native_apic_msr_eoi_write+0xb/0x10 arch/x86/include/asm/apic.h:214 Code: 8b 06 bf f0 03 00 00 89 de 5b 41 5e 41 5f ff e0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b9 0b 08 00 00 31 c0 31 d2 0f 30 0f 1f 40 00 81 ff cf 00 00 00 7f 0c 83 ff 20 74 2a 83 ff 30 74 RSP: 0018:ffffc900000076e0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff8be339c8 RCX: 000000000000080b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000b0 RBP: 0000000000000000 R08: ffffffff8f0ea008 R09: ffffffff8f0ea018 R10: ffffffff8f0ea010 R11: ffffffff8f0ea003 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f3f1a6e56c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3f1a6a2ff8 CR3: 000000007b7ec000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: apic_eoi arch/x86/include/asm/apic.h:400 [inline] ack_APIC_irq arch/x86/include/asm/apic.h:446 [inline] __sysvec_irq_work+0x51/0x240 arch/x86/kernel/irq_work.c:19 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x4a/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 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 32 e1 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc900000077c0 EFLAGS: 00000206 RAX: d7ae58efe44b3e00 RBX: 1ffff92000000efc RCX: d7ae58efe44b3e00 RDX: dffffc0000000000 RSI: ffffffff8a2b2800 RDI: ffffffff8a79fe00 RBP: ffffc900000078a0 R08: ffffffff901d51c7 R09: 1ffffffff203aa38 R10: dffffc0000000000 R11: fffffbfff203aa39 R12: ffffffff8c323000 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] ndisc_send_skb+0xde0/0x1500 net/ipv6/ndisc.c:521 addrconf_rs_timer+0x2d1/0x630 net/ipv6/addrconf.c:3956 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x53e/0x800 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x339/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x80 kernel/kcov.c:294 Code: 28 4d 39 ca 77 22 89 ff 89 f6 4a c7 44 02 08 03 00 00 00 4a 89 7c 02 10 4a 89 74 02 18 4a 89 44 02 20 48 ff c1 48 89 0a c3 90 <48> 8b 04 24 65 48 8b 0d c4 37 89 7e 65 8b 15 c5 37 89 7e 81 e2 00 RSP: 0018:ffffc9000328ecd8 EFLAGS: 00000287 RAX: ffffffff81810e28 RBX: 000000000000002c RCX: 0000000000080000 RDX: ffffc90005971000 RSI: 000000000000002c RDI: 0000000000002000 RBP: ffffc9000328ee10 R08: ffffffff8d89f02f R09: 1ffffffff1b13e05 R10: dffffc0000000000 R11: fffffbfff1b13e06 R12: dffffc0000000000 R13: 1ffff92000651dac R14: ffffc9000328ed80 R15: ffffc9000328eda0 perf_trace_buf_alloc+0x24/0x300 kernel/trace/trace_event_perf.c:409 perf_trace_lock+0x197/0x390 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x84a/0x8a0 kernel/locking/lockdep.c:5634 rcu_read_unlock include/linux/rcupdate.h:773 [inline] pfn_valid include/linux/mmzone.h:-1 [inline] __virt_addr_valid+0x3bd/0x470 arch/x86/mm/physaddr.c:65 check_heap_object mm/usercopy.c:228 [inline] __check_object_size+0xa8/0x410 mm/usercopy.c:286 check_object_size include/linux/thread_info.h:199 [inline] check_copy_size include/linux/thread_info.h:232 [inline] copy_to_user include/linux/uaccess.h:199 [inline] bpf_verifier_vlog+0x1a7/0x350 kernel/bpf/verifier.c:303 verbose+0x1f2/0x2b0 kernel/bpf/verifier.c:348 print_bpf_insn+0xed7/0x1980 kernel/bpf/disasm.c:-1 do_check+0x4867/0xeb00 kernel/bpf/verifier.c:11273 do_check_common+0xe82/0x16e0 kernel/bpf/verifier.c:13512 do_check_main kernel/bpf/verifier.c:13575 [inline] bpf_check+0x9c84/0xf270 kernel/bpf/verifier.c:14146 bpf_prog_load+0xfec/0x1510 kernel/bpf/syscall.c:2354 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f3f1c48be59 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:00007f3f1a6e5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f3f1c704fa0 RCX: 00007f3f1c48be59 RDX: 0000000000000048 RSI: 0000200000000080 RDI: 0000000000000005 RBP: 00007f3f1c521d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3f1c705038 R14: 00007f3f1c704fa0 R15: 00007ffcb246fbb8