bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P31/1:b..l rcu: (detected by 1, t=10503 jiffies, g=134329, q=1411 ncpus=2) task:khungtaskd state:R running task stack:28744 pid:31 tgid:31 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1821/0x5740 kernel/sched/core.c:7189 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline] irqentry_exit+0x14f/0x760 kernel/entry/common.c:164 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:check_hung_uninterruptible_tasks kernel/hung_task.c:319 [inline] RIP: 0010:watchdog+0x314/0x1030 kernel/hung_task.c:561 Code: 00 48 8b 4c 24 30 4c 8b 33 49 83 c6 10 4c 89 f0 48 c1 e8 03 80 3c 28 00 74 0d 4c 89 f7 e8 64 16 6b 00 48 8b 4c 24 30 4d 8b 2e <4d> 39 f5 0f 84 3e 0b 00 00 48 8d 81 b8 fa ff ff 48 89 44 24 38 48 RSP: 0018:ffffc90000a77d60 EFLAGS: 00000246 RAX: 1ffff110061eb2ba RBX: ffff888034f42840 RCX: ffff888034f42430 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffff88802dd2002b R09: 1ffff11005ba4005 R10: dffffc0000000000 R11: ffffed1005ba4006 R12: 00000000003ffef5 R13: ffff888034f425a8 R14: ffff888030f595d0 R15: 1ffffffff1cc1e50 kthread+0x389/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: rcu_preempt kthread starved for 3612 jiffies! g134329 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:27968 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1821/0x5740 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0x164/0x360 kernel/sched/core.c:7283 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+0x389/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 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: 10154 Comm: kworker/u8:11 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: bat_events batadv_dat_purge RIP: 0010:rcu_lockdep_current_cpu_online+0x32/0x120 kernel/rcu/tree.c:4040 Code: 53 65 8b 0d 40 3d 8e 11 b0 01 f7 c1 00 00 f0 00 0f 85 d5 00 00 00 83 3d ff 9a 85 0e 00 0f 84 c8 00 00 00 65 ff 05 1e 3d 8e 11 59 cd fd 09 89 c3 83 f8 08 0f 83 c7 00 00 00 49 be 00 00 00 00 RSP: 0018:ffffc900000067e8 EFLAGS: 00000282 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000101 RDX: ffff88802984dc40 RSI: ffffffff8c28af40 RDI: ffffffff8c28af00 RBP: 0000000000000001 R08: ffffc90000006b40 R09: ffffc90000006b50 R10: ffffc900000069a0 R11: fffff52000000d36 R12: 0000000000000003 R13: ffff8880500680c8 R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88812528a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f343d200020 CR3: 0000000079638000 CR4: 00000000003526f0 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:113 [inline] rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349 __in6_dev_get include/net/addrconf.h:348 [inline] ip6_ignore_linkdown+0x66/0x140 include/net/addrconf.h:449 find_match+0x9c/0xb40 net/ipv6/route.c:780 __find_rr_leaf+0x248/0x760 net/ipv6/route.c:868 find_rr_leaf net/ipv6/route.c:889 [inline] rt6_select net/ipv6/route.c:933 [inline] fib6_table_lookup+0x3b4/0xa80 net/ipv6/route.c:2251 ip6_pol_route+0x228/0x13d0 net/ipv6/route.c:2287 pol_lookup_func include/net/ip6_fib.h:667 [inline] fib6_rule_lookup+0x556/0x730 net/ipv6/fib6_rules.c:123 ip6_route_input_lookup net/ipv6/route.c:2356 [inline] ip6_route_input+0x730/0xad0 net/ipv6/route.c:2659 ip6_rcv_finish+0x141/0x280 net/ipv6/ip6_input.c:117 ip_sabotage_in+0x1e1/0x270 net/bridge/br_netfilter_hooks.c:984 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316 __netif_receive_skb_one_core net/core/dev.c:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] netif_receive_skb_internal net/core/dev.c:6401 [inline] netif_receive_skb+0x278/0xbf0 net/core/dev.c:6460 NF_HOOK+0xa4/0x3a0 include/linux/netfilter.h:318 br_handle_frame_finish+0x1541/0x1c80 net/bridge/br_input.c:-1 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1 br_nf_pre_routing_finish_ipv6+0x91f/0xc30 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:183 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442 __netif_receive_skb_core+0x98f/0x3170 net/core/dev.c:6089 __netif_receive_skb_one_core net/core/dev.c:6200 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] process_backlog+0x76d/0x1950 net/core/dev.c:6666 __napi_poll+0xae/0x340 net/core/dev.c:7733 napi_poll net/core/dev.c:7796 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7953 handle_softirqs+0x22a/0x840 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:396 [inline] __batadv_dat_purge net/batman-adv/distributed-arp-table.c:185 [inline] batadv_dat_purge+0x2da/0x3c0 net/batman-adv/distributed-arp-table.c:204 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478 kthread+0x389/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 net_ratelimit: 10296 callbacks suppressed bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0) net_ratelimit: 13102 callbacks suppressed bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ae:f5:29:b1:32:0b, vlan:0)