bridge0: received packet on veth0_to_bridge with own address as source address (addr:66:13:66:31:b9:eb, vlan:0)
==================================================================
BUG: KCSAN: data-race in br_fdb_update / br_fdb_update

read to 0xffff888103e41d40 of 8 bytes by interrupt on cpu 0:
 br_fdb_update+0x10e/0x480 net/bridge/br_fdb.c:903
 br_handle_frame_finish+0x32e/0xe70 net/bridge/br_input.c:141
 br_nf_hook_thresh+0x1e5/0x220
 br_nf_pre_routing_finish_ipv6+0x575/0x5a0
 NF_HOOK include/linux/netfilter.h:314 [inline]
 br_nf_pre_routing_ipv6+0x1f6/0x2a0 net/bridge/br_netfilter_ipv6.c:184
 br_nf_pre_routing+0x517/0xbc0 net/bridge/br_netfilter_hooks.c:536
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
 br_handle_frame+0x4dd/0x9a0 net/bridge/br_input.c:424
 __netif_receive_skb_core+0xba7/0x2400 net/core/dev.c:5598
 __netif_receive_skb_one_core net/core/dev.c:5702 [inline]
 __netif_receive_skb+0x5a/0x280 net/core/dev.c:5817
 process_backlog+0x22e/0x440 net/core/dev.c:6149
 __napi_poll+0x63/0x3c0 net/core/dev.c:6902
 napi_poll net/core/dev.c:6971 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:7093
 handle_softirqs+0xbf/0x280 kernel/softirq.c:561
 do_softirq+0x5e/0x90 kernel/softirq.c:462
 __local_bh_enable_ip+0x6e/0x70 kernel/softirq.c:389
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 update_defense_level+0x575/0x5b0 net/netfilter/ipvs/ip_vs_ctl.c:210
 defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3317
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3398
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

write to 0xffff888103e41d40 of 8 bytes by interrupt on cpu 1:
 br_fdb_update+0x142/0x480 net/bridge/br_fdb.c:904
 br_handle_frame_finish+0x32e/0xe70 net/bridge/br_input.c:141
 br_nf_hook_thresh+0x1e5/0x220
 br_nf_pre_routing_finish_ipv6+0x575/0x5a0
 NF_HOOK include/linux/netfilter.h:314 [inline]
 br_nf_pre_routing_ipv6+0x1f6/0x2a0 net/bridge/br_netfilter_ipv6.c:184
 br_nf_pre_routing+0x517/0xbc0 net/bridge/br_netfilter_hooks.c:536
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
 br_handle_frame+0x4dd/0x9a0 net/bridge/br_input.c:424
 __netif_receive_skb_core+0xba7/0x2400 net/core/dev.c:5598
 __netif_receive_skb_one_core net/core/dev.c:5702 [inline]
 __netif_receive_skb+0x5a/0x280 net/core/dev.c:5817
 process_backlog+0x22e/0x440 net/core/dev.c:6149
 __napi_poll+0x63/0x3c0 net/core/dev.c:6902
 napi_poll net/core/dev.c:6971 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:7093
 handle_softirqs+0xbf/0x280 kernel/softirq.c:561
 do_softirq+0x5e/0x90 kernel/softirq.c:462
 __local_bh_enable_ip+0x6e/0x70 kernel/softirq.c:389
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x36/0x40 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 __batadv_dat_purge net/batman-adv/distributed-arp-table.c:186 [inline]
 batadv_dat_purge+0x1e0/0x260 net/batman-adv/distributed-arp-table.c:205
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3317
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3398
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00000000ffffcc13 -> 0x00000000ffffcc14

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4760 Comm: kworker/u8:8 Not tainted 6.13.0-syzkaller-00918-g95ec54a420b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: bat_events batadv_dat_purge
==================================================================
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 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:aa:aa:aa:aa:0c, 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:66:13:66:31:b9:eb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:66:13:66:31:b9:eb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:66:13:66:31:b9:eb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:66:13:66:31:b9:eb, 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)