bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P21720/1:b..l rcu: (detected by 1, t=10503 jiffies, g=83173, q=1057 ncpus=2) task:syz.0.4133 state:R running task stack:26120 pid:21720 tgid:21719 ppid:18210 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 65 d5 0b 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 e1 42 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 c6 bb 0e 0a cc 48 8d 3d 9e 5c 73 RSP: 0018:ffffc90003427288 EFLAGS: 00000286 RAX: 66f9f702fd3a1800 RBX: 0000000000000246 RCX: 0000000000000046 RDX: 00000000d9196744 RSI: ffffffff8e16324d RDI: ffffffff8c27aa00 RBP: 0000000000000000 R08: ffffffff823be48a R09: ffffffff8e7602e0 R10: dffffc0000000000 R11: ffffed100b24ed24 R12: 0000000000000002 R13: ffffffff8e7602e0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] __page_table_check_zero+0x87/0x3e0 mm/page_table_check.c:138 page_table_check_free include/linux/page_table_check.h:46 [inline] __free_pages_prepare mm/page_alloc.c:1434 [inline] __free_frozen_pages+0xc3b/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5532 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4501 [inline] slab_alloc_node mm/slub.c:4830 [inline] __do_kmalloc_node mm/slub.c:5218 [inline] __kvmalloc_node_noprof+0x4d7/0x8a0 mm/slub.c:6711 compute_postorder+0x7f/0x970 kernel/bpf/verifier.c:18956 bpf_check+0x2164/0x1ce00 kernel/bpf/verifier.c:25972 bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3089 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6228 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb36d79c799 RSP: 002b:00007fb36e726028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fb36da15fa0 RCX: 00007fb36d79c799 RDX: 0000000000000094 RSI: 0000200000000180 RDI: 0000000000000005 RBP: 00007fb36d832bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb36da16038 R14: 00007fb36da15fa0 R15: 00007ffe17d93c48 rcu: rcu_preempt kthread starved for 1400 jiffies! g83173 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:28128 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_power_efficient neigh_periodic_work RIP: 0010:skb_dst include/linux/skbuff.h:1165 [inline] RIP: 0010:skb_tunnel_info include/net/dst_metadata.h:63 [inline] RIP: 0010:ip6_route_input+0x42b/0xad0 net/ipv6/route.c:2645 Code: 1f e8 29 c2 55 f7 41 89 c6 31 ff 89 c6 e8 9d 93 71 f7 45 85 f6 0f 84 10 05 00 00 e8 4f 8f 71 f7 48 8b 44 24 10 42 80 3c 28 00 <74> 08 4c 89 ff e8 8b b4 db f7 4d 8b 37 4c 89 f6 48 83 e6 fe 31 ff RSP: 0018:ffffc900000078e0 EFLAGS: 00000246 RAX: 1ffff11012410573 RBX: 1ffff92000000f24 RCX: ffff88801d2e3c80 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000007a98 R08: ffffc90000007a0f R09: 0000000000000000 R10: ffffc900000079c0 R11: fffff52000000f42 R12: ffffc90000007940 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888092082b98 FS: 0000000000000000(0000) GS:ffff888125464000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb36e6e4d58 CR3: 000000000e54c000 CR4: 00000000003526f0 Call Trace: ip6_rcv_finish+0x141/0x280 net/ipv6/ip6_input.c:77 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6167 [inline] __netif_receive_skb net/core/dev.c:6280 [inline] process_backlog+0x7dd/0x1950 net/core/dev.c:6631 __napi_poll+0xae/0x340 net/core/dev.c:7695 napi_poll net/core/dev.c:7758 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7915 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:395 [inline] neigh_periodic_work+0xc28/0xe50 net/core/neighbour.c:1038 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 net_ratelimit: 17816 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) net_ratelimit: 20589 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:8e:54:e4:8e:f2, vlan:0)