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BUG: KCSAN: data-race in br_handle_frame_finish / br_handle_frame_finish

read-write to 0xffff88813818c170 of 8 bytes by interrupt on cpu 1:
 br_handle_frame_finish+0xd4f/0xee0 net/bridge/br_input.c:189
 br_nf_hook_thresh+0x1ed/0x220
 br_nf_pre_routing_finish_ipv6+0x511/0x540
 NF_HOOK include/linux/netfilter.h:302 [inline]
 br_nf_pre_routing_ipv6+0x1e3/0x2a0 net/bridge/br_netfilter_ipv6.c:237
 br_nf_pre_routing+0x526/0xba0 net/bridge/br_netfilter_hooks.c:507
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:272 [inline]
 br_handle_frame+0x4ca/0x8e0 net/bridge/br_input.c:416
 __netif_receive_skb_core+0x9fb/0x1ec0 net/core/dev.c:5376
 __netif_receive_skb_one_core net/core/dev.c:5480 [inline]
 __netif_receive_skb+0x57/0x1b0 net/core/dev.c:5596
 process_backlog+0x21f/0x380 net/core/dev.c:5924
 __napi_poll+0x60/0x3b0 net/core/dev.c:6485
 napi_poll net/core/dev.c:6552 [inline]
 net_rx_action+0x328/0x6c0 net/core/dev.c:6663
 __do_softirq+0xe4/0x2b0 kernel/softirq.c:571
 run_ksoftirqd+0x23/0x30 kernel/softirq.c:934
 smpboot_thread_fn+0x2f8/0x490 kernel/smpboot.c:164
 kthread+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read-write to 0xffff88813818c170 of 8 bytes by interrupt on cpu 0:
 br_handle_frame_finish+0xd4f/0xee0 net/bridge/br_input.c:189
 br_nf_hook_thresh+0x1ed/0x220
 br_nf_pre_routing_finish_ipv6+0x511/0x540
 NF_HOOK include/linux/netfilter.h:302 [inline]
 br_nf_pre_routing_ipv6+0x1e3/0x2a0 net/bridge/br_netfilter_ipv6.c:237
 br_nf_pre_routing+0x526/0xba0 net/bridge/br_netfilter_hooks.c:507
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:272 [inline]
 br_handle_frame+0x4ca/0x8e0 net/bridge/br_input.c:416
 __netif_receive_skb_core+0x9fb/0x1ec0 net/core/dev.c:5376
 __netif_receive_skb_one_core net/core/dev.c:5480 [inline]
 __netif_receive_skb+0x57/0x1b0 net/core/dev.c:5596
 process_backlog+0x21f/0x380 net/core/dev.c:5924
 __napi_poll+0x60/0x3b0 net/core/dev.c:6485
 napi_poll net/core/dev.c:6552 [inline]
 net_rx_action+0x328/0x6c0 net/core/dev.c:6663
 __do_softirq+0xe4/0x2b0 kernel/softirq.c:571
 do_softirq+0xb5/0xf0 kernel/softirq.c:472
 __local_bh_enable_ip+0x73/0x80 kernel/softirq.c:396
 __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:395 [inline]
 batadv_nc_purge_paths+0x21c/0x260 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x3db/0xac0 net/batman-adv/network-coding.c:720
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2289
 worker_thread+0x5ef/0xa10 kernel/workqueue.c:2436
 kthread+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x0000000000013509 -> 0x000000000001350a

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25 Comm: kworker/u4:1 Not tainted 6.2.0-rc8-syzkaller-00015-gf6feea56f66d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Workqueue: bat_events batadv_nc_worker
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