bridge0: received packet on veth0_to_bridge with own address as source address (addr:52:89:6a:6b:b1:2a, vlan:0)
==================================================================
BUG: KCSAN: data-race in br_fdb_update / br_fdb_update

read to 0xffff88812ada82c0 of 8 bytes by interrupt on cpu 1:
 br_fdb_update+0x10e/0x480 net/bridge/br_fdb.c:903
 br_handle_frame_finish+0x338/0xe90 net/bridge/br_input.c:144
 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:508
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:282 [inline]
 br_handle_frame+0x4e0/0x9b0 net/bridge/br_input.c:433
 __netif_receive_skb_core+0xb1a/0x2350 net/core/dev.c:5722
 __netif_receive_skb_one_core net/core/dev.c:5826 [inline]
 __netif_receive_skb+0x5a/0x280 net/core/dev.c:5941
 process_backlog+0x22e/0x440 net/core/dev.c:6289
 __napi_poll+0x63/0x3c0 net/core/dev.c:7106
 napi_poll net/core/dev.c:7175 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:7297
 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:185 [inline]
 batadv_dat_purge+0x1e0/0x260 net/batman-adv/distributed-arp-table.c:204
 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+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

write to 0xffff88812ada82c0 of 8 bytes by interrupt on cpu 0:
 br_fdb_update+0x142/0x480 net/bridge/br_fdb.c:904
 br_handle_frame_finish+0x338/0xe90 net/bridge/br_input.c:144
 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:508
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:282 [inline]
 br_handle_frame+0x4e0/0x9b0 net/bridge/br_input.c:433
 __netif_receive_skb_core+0xb1a/0x2350 net/core/dev.c:5722
 __netif_receive_skb_one_core net/core/dev.c:5826 [inline]
 __netif_receive_skb+0x5a/0x280 net/core/dev.c:5941
 process_backlog+0x22e/0x440 net/core/dev.c:6289
 __napi_poll+0x63/0x3c0 net/core/dev.c:7106
 napi_poll net/core/dev.c:7175 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:7297
 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_write_unlock_bh include/linux/rwlock_api_smp.h:281 [inline]
 _raw_write_unlock_bh+0x1f/0x30 kernel/locking/spinlock.c:366
 neigh_periodic_work+0x605/0x6b0 net/core/neighbour.c:968
 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+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000100009097 -> 0x0000000100009098

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 1038 Comm: kworker/0:2 Not tainted 6.14.0-rc1-syzkaller-00081-gbb066fe812d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: events_power_efficient neigh_periodic_work
==================================================================
net_ratelimit: 52830 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:52:89:6a:6b:b1:2a, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:52:89:6a:6b:b1:2a, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:52:89:6a:6b:b1:2a, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:52:89:6a:6b:b1:2a, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 56287 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:52:89:6a:6b:b1:2a, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:52:89:6a:6b:b1:2a, 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:52:89:6a:6b:b1:2a, vlan:0)