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rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=2cd/1/0x4000000000000000 softirq=87574/87575 fqs=4506 (t=10500 jiffies g=129669 q=1995) NMI backtrace for cpu 0 CPU: 0 PID: 28997 Comm: syz.9.7056 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: <IRQ> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349 print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline] rcu_pending kernel/rcu/tree.c:3936 [inline] rcu_sched_clock_irq+0x6ea/0x1120 kernel/rcu/tree.c:2619 update_process_times+0x193/0x200 kernel/time/timer.c:2021 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4ad/0xb70 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline] __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:kasan_quarantine_put+0x84/0x220 mm/kasan/quarantine.c:234 Code: e8 41 18 c1 ff 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 0f 85 83 00 00 00 41 f7 c7 00 02 00 00 74 01 fb 31 c0 <48> 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f c3 48 8d 80 40 62 03 00 45 RSP: 0018:ffffc90000007a40 EFLAGS: 00000206 RAX: 1e1d1dfde2f14101 RBX: ffff8880614153c0 RCX: 1e1d1dfde2f14100 RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f800 RBP: ffffc90000007ad8 R08: ffffffff901d3197 R09: 1ffffffff203a632 R10: dffffc0000000000 R11: fffffbfff203a633 R12: ffff88801bbe5140 R13: ffff8880614153c0 R14: 00000000000cb9f8 R15: 0000000000000286 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3520 neigh_probe net/core/neighbour.c:1019 [inline] neigh_timer_handler+0xaca/0xfe0 net/core/neighbour.c:1099 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 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6799 Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 85 ee 8d f7 e8 f0 db ba f7 fb bf 01 00 00 00 <e8> 65 b5 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f RSP: 0018:ffffc90003a5f220 EFLAGS: 00000282 RAX: 1e1d1dfde2f14100 RBX: 0000000000000000 RCX: 1e1d1dfde2f14100 RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: 0000000000000001 RBP: ffffc90003a5f2d0 R08: ffff8880b903b30b R09: 1ffff11017207661 R10: dffffc0000000000 R11: ffffed1017207662 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200074be44 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:__nr_to_section include/linux/mmzone.h:1383 [inline] RIP: 0010:__pfn_to_section include/linux/mmzone.h:1468 [inline] RIP: 0010:get_pageblock_bitmap mm/page_alloc.c:470 [inline] RIP: 0010:__get_pfnblock_flags_mask mm/page_alloc.c:495 [inline] RIP: 0010:get_pfnblock_migratetype mm/page_alloc.c:521 [inline] RIP: 0010:free_unref_page_prepare+0x2a8/0x6c0 mm/page_alloc.c:3320 Code: c1 e8 22 75 65 48 c7 c0 80 2b 33 96 48 c1 e8 03 42 80 3c 20 00 74 0c 48 c7 c7 80 2b 33 96 e8 af 23 0a 00 48 8b 05 08 21 7f 14 <48> 85 c0 74 3b 4c 89 f1 48 c1 e9 16 4c 8d 3c c8 4c 89 f8 48 c1 e8 RSP: 0018:ffffc90003a5f398 EFLAGS: 00000246 RAX: ffff88823fff0000 RBX: ffffea00008e6800 RCX: 0000000000000000 RDX: 0000000000001000 RSI: 00000000000000ff RDI: ffffed1004735000 RBP: 0000000000000003 R08: dffffc0000000000 R09: ffffed1004734000 R10: dffffc0000000000 R11: ffffed1017207662 R12: dffffc0000000000 R13: 0000000000008001 R14: 00000000000239a0 R15: 0000000000000003 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396 free_slab mm/slub.c:2020 [inline] discard_slab mm/slub.c:2026 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2512 put_cpu_partial+0x12d/0x190 mm/slub.c:2592 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3261 alloc_vmap_area+0x1a2/0x1a10 mm/vmalloc.c:1538 __get_vm_area_node+0x14f/0x2d0 mm/vmalloc.c:2430 __vmalloc_node_range+0xef/0x8b0 mm/vmalloc.c:3027 __vmalloc_node mm/vmalloc.c:3087 [inline] __vmalloc+0x76/0x80 mm/vmalloc.c:3101 bpf_prog_alloc_no_stats+0x36/0x2c0 kernel/bpf/core.c:90 bpf_prog_alloc+0x1a/0x1e0 kernel/bpf/core.c:124 bpf_prog_load+0x7c6/0x1510 kernel/bpf/syscall.c:2301 __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: 0033:0x7fcde3250629 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:00007fcde14aa028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fcde34c9fa0 RCX: 00007fcde3250629 RDX: 000000000000006d RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007fcde32e6b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcde34ca038 R14: 00007fcde34c9fa0 R15: 00007ffce23741e8 </TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026/02/24 18:04 | linux-5.15.y | 3330a8d33e08 | 96b1aa46 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in neigh_timer_handler | ||
| 2026/02/22 22:34 | linux-5.15.y | 3330a8d33e08 | 6e7b5511 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in neigh_timer_handler |