==================================================================
BUG: KCSAN: data-race in batadv_tt_local_add / batadv_tt_local_add
write to 0xffff8881047891c0 of 8 bytes by interrupt on cpu 1:
batadv_tt_local_add+0x16e/0x1050 net/batman-adv/translation-table.c:619
batadv_interface_tx+0x42b/0xae0 net/batman-adv/mesh-interface.c:236
__netdev_start_xmit include/linux/netdevice.h:5273 [inline]
netdev_start_xmit include/linux/netdevice.h:5282 [inline]
xmit_one net/core/dev.c:3866 [inline]
dev_hard_start_xmit+0x125/0x3e0 net/core/dev.c:3882
__dev_queue_xmit+0xdb1/0x1f20 net/core/dev.c:4832
dev_queue_xmit include/linux/netdevice.h:3381 [inline]
br_dev_queue_push_xmit+0x42d/0x4e0 net/bridge/br_forward.c:53
NF_HOOK include/linux/netfilter.h:318 [inline]
br_forward_finish+0x89/0x190 net/bridge/br_forward.c:66
br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:-1 [inline]
br_nf_forward_finish+0x6ff/0x780 net/bridge/br_netfilter_hooks.c:662
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_forward_arp net/bridge/br_netfilter_hooks.c:752 [inline]
br_nf_forward+0xae3/0xec0 net/bridge/br_netfilter_hooks.c:775
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0x78/0x180 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK include/linux/netfilter.h:316 [inline]
__br_forward+0x282/0x360 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0x1b8/0x280 net/bridge/br_forward.c:191
br_flood+0x21f/0x460 net/bridge/br_forward.c:238
br_handle_frame_finish+0xd96/0xfc0 net/bridge/br_input.c:229
nf_hook_bridge_pre net/bridge/br_input.c:313 [inline]
br_handle_frame+0x5f5/0xa30 net/bridge/br_input.c:442
__netif_receive_skb_core+0x5b1/0x1950 net/core/dev.c:6039
__netif_receive_skb_one_core net/core/dev.c:6150 [inline]
__netif_receive_skb+0x59/0x270 net/core/dev.c:6265
process_backlog+0x228/0x420 net/core/dev.c:6617
__napi_poll+0x5f/0x300 net/core/dev.c:7681
napi_poll net/core/dev.c:7744 [inline]
net_rx_action+0x452/0x930 net/core/dev.c:7896
handle_softirqs+0xb9/0x280 kernel/softirq.c:622
do_softirq+0x45/0x60 kernel/softirq.c:523
__local_bh_enable_ip+0x70/0x80 kernel/softirq.c:450
__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
_raw_spin_unlock_bh+0x18/0x20 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+0x1e3/0x270 net/batman-adv/distributed-arp-table.c:204
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0x4cd/0x9d0 kernel/workqueue.c:3340
worker_thread+0x581/0x770 kernel/workqueue.c:3421
kthread+0x488/0x510 kernel/kthread.c:463
ret_from_fork+0x148/0x280 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
write to 0xffff8881047891c0 of 8 bytes by interrupt on cpu 0:
batadv_tt_local_add+0x16e/0x1050 net/batman-adv/translation-table.c:619
batadv_interface_tx+0x42b/0xae0 net/batman-adv/mesh-interface.c:236
__netdev_start_xmit include/linux/netdevice.h:5273 [inline]
netdev_start_xmit include/linux/netdevice.h:5282 [inline]
xmit_one net/core/dev.c:3866 [inline]
dev_hard_start_xmit+0x125/0x3e0 net/core/dev.c:3882
__dev_queue_xmit+0xdb1/0x1f20 net/core/dev.c:4832
dev_queue_xmit include/linux/netdevice.h:3381 [inline]
br_dev_queue_push_xmit+0x42d/0x4e0 net/bridge/br_forward.c:53
NF_HOOK include/linux/netfilter.h:318 [inline]
br_forward_finish+0x89/0x190 net/bridge/br_forward.c:66
br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:-1 [inline]
br_nf_forward_finish+0x6ff/0x780 net/bridge/br_netfilter_hooks.c:662
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_forward_arp net/bridge/br_netfilter_hooks.c:752 [inline]
br_nf_forward+0xae3/0xec0 net/bridge/br_netfilter_hooks.c:775
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0x78/0x180 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK include/linux/netfilter.h:316 [inline]
__br_forward+0x282/0x360 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0x1b8/0x280 net/bridge/br_forward.c:191
br_flood+0x21f/0x460 net/bridge/br_forward.c:238
br_handle_frame_finish+0xd96/0xfc0 net/bridge/br_input.c:229
nf_hook_bridge_pre net/bridge/br_input.c:313 [inline]
br_handle_frame+0x5f5/0xa30 net/bridge/br_input.c:442
__netif_receive_skb_core+0x5b1/0x1950 net/core/dev.c:6039
__netif_receive_skb_one_core net/core/dev.c:6150 [inline]
__netif_receive_skb+0x59/0x270 net/core/dev.c:6265
process_backlog+0x228/0x420 net/core/dev.c:6617
__napi_poll+0x5f/0x300 net/core/dev.c:7681
napi_poll net/core/dev.c:7744 [inline]
net_rx_action+0x452/0x930 net/core/dev.c:7896
handle_softirqs+0xb9/0x280 kernel/softirq.c:622
run_ksoftirqd+0x1c/0x30 kernel/softirq.c:1063
smpboot_thread_fn+0x32a/0x510 kernel/smpboot.c:160
kthread+0x488/0x510 kernel/kthread.c:463
ret_from_fork+0x148/0x280 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
value changed: 0x00000000ffffbe11 -> 0x00000000ffffbe12
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
==================================================================
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 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 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 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 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)
net_ratelimit: 24713 callbacks suppressed
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 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 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 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 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)