rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-....: (1 GPs behind) idle=249c/1/0x4000000000000000 softirq=20934/20936 fqs=5250 rcu: hardirqs softirqs csw/system rcu: number: 15605291 0 0 rcu: cputime: 6186 46341 0 ==> 52510(ms) rcu: (detected by 0, t=10502 jiffies, g=23305, q=1366 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8346 Comm: syz.1.943 Not tainted 6.6.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:user_mode arch/x86/include/asm/ptrace.h:214 [inline] RIP: 0010:instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] RIP: 0010:sysvec_irq_work+0x24/0xc0 arch/x86/kernel/irq_work.c:17 Code: cc cc cc cc cc cc 66 0f 1f 00 55 53 48 89 fb e8 72 2e 00 00 89 c5 48 c7 c7 40 3e a5 8a e8 34 3c 00 00 65 c6 05 bc 96 96 75 01 83 88 00 00 00 03 75 17 48 c7 c7 60 3e a5 8a e8 17 3c 00 00 65 RSP: 0018:ffffc900001f06e0 EFLAGS: 00000086 RAX: 0000000000000001 RBX: ffffc900001f06f8 RCX: 8132f56f8d422e00 RDX: 0000000000000000 RSI: ffffffff8aa53e40 RDI: ffffffff8afc66c0 RBP: 0000000000000000 R08: ffffffff8e4a882f R09: 1ffffffff1c95105 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007efc6fb6e6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c31cb3d CR3: 0000000068056000 CR4: 00000000003506e0 DR0: 0000200000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 39 58 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc900001f07a0 EFLAGS: 00000206 RAX: 8132f56f8d422e00 RBX: 1ffff9200003e0fc RCX: 8132f56f8d422e00 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0 RBP: ffffc900001f08a0 R08: ffffffff90da35ff R09: 1ffffffff21b46bf R10: dffffc0000000000 R11: fffffbfff21b46c0 R12: ffffffff8cd35400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:818 [inline] ndisc_send_skb+0xd9d/0x14b0 net/ipv6/ndisc.c:521 addrconf_rs_timer+0x2bc/0x600 net/ipv6/addrconf.c:4007 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x52d/0x7d0 kernel/time/timer.c:2022 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035 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:put_cpu_partial+0x1b0/0x250 mm/slub.c:2737 Code: 3b 44 24 18 0f 85 b4 00 00 00 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 ec e1 90 08 f7 c5 00 02 00 00 74 c0 fb 4d 85 e4 <75> bf eb c8 e8 c7 90 3e 02 85 c0 0f 84 e9 fe ff ff 83 3d 78 56 6e RSP: 0018:ffffc90003657760 EFLAGS: 00000286 RAX: 8132f56f8d422e00 RBX: ffff888017841640 RCX: 8132f56f8d422e00 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0 RBP: 0000000000000286 R08: ffffffff90da352f R09: 1ffffffff21b46a5 R10: dffffc0000000000 R11: fffffbfff21b46a6 R12: ffffea0000854f00 R13: 0000000000000001 R14: ffff88802ef10000 R15: ffff8880b8f403c0 __slab_free+0x31d/0x410 mm/slub.c:3686 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x13e/0x260 mm/slub.c:3524 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] bpf_int_jit_compile+0x1bb/0x1130 arch/x86/net/bpf_jit_comp.c:2845 bpf_prog_select_runtime+0x490/0x7e0 kernel/bpf/core.c:2389 bpf_prog_load+0x11f6/0x16d0 kernel/bpf/syscall.c:2748 __sys_bpf+0x55a/0x800 kernel/bpf/syscall.c:5467 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline] __se_sys_bpf kernel/bpf/syscall.c:5569 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569 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: 0033:0x7efc6ed8ebe9 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:00007efc6fb6e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007efc6efb5fa0 RCX: 00007efc6ed8ebe9 RDX: 0000000000000090 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007efc6ee11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc6efb6038 R14: 00007efc6efb5fa0 R15: 00007fffee6520d8