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BUG: KCSAN: data-race in br_handle_frame_finish / br_handle_frame_finish

read-write to 0xffff88812db7a148 of 8 bytes by interrupt on cpu 1:
 br_handle_frame_finish+0x97b/0xa50 net/bridge/br_input.c:142
 br_nf_hook_thresh+0x184/0x1c0 net/bridge/br_netfilter_hooks.c:1024
 br_nf_pre_routing_finish_ipv6+0x473/0x490 net/bridge/br_netfilter_ipv6.c:187
 NF_HOOK include/linux/netfilter.h:301 [inline]
 br_nf_pre_routing_ipv6+0x1ed/0x280 net/bridge/br_netfilter_ipv6.c:236
 br_nf_pre_routing+0x4c0/0xb20 net/bridge/br_netfilter_hooks.c:505
 nf_hook_entry_hookfn include/linux/netfilter.h:136 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:224 [inline]
 br_handle_frame+0x483/0xb90 net/bridge/br_input.c:367
 __netif_receive_skb_core+0xa5c/0x1de0 net/core/dev.c:5217
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0x52/0x1b0 net/core/dev.c:5437
 process_backlog+0x23f/0x3d0 net/core/dev.c:6327
 napi_poll+0x181/0x630 net/core/dev.c:6805
 net_rx_action+0x17a/0x480 net/core/dev.c:6888
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:650
 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read-write to 0xffff88812db7a148 of 8 bytes by interrupt on cpu 0:
 br_handle_frame_finish+0x97b/0xa50 net/bridge/br_input.c:142
 br_nf_hook_thresh+0x184/0x1c0 net/bridge/br_netfilter_hooks.c:1024
 br_nf_pre_routing_finish_ipv6+0x473/0x490 net/bridge/br_netfilter_ipv6.c:187
 NF_HOOK include/linux/netfilter.h:301 [inline]
 br_nf_pre_routing_ipv6+0x1ed/0x280 net/bridge/br_netfilter_ipv6.c:236
 br_nf_pre_routing+0x4c0/0xb20 net/bridge/br_netfilter_hooks.c:505
 nf_hook_entry_hookfn include/linux/netfilter.h:136 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:224 [inline]
 br_handle_frame+0x483/0xb90 net/bridge/br_input.c:367
 __netif_receive_skb_core+0xa5c/0x1de0 net/core/dev.c:5217
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0x52/0x1b0 net/core/dev.c:5437
 process_backlog+0x23f/0x3d0 net/core/dev.c:6327
 napi_poll+0x181/0x630 net/core/dev.c:6805
 net_rx_action+0x17a/0x480 net/core/dev.c:6888
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:650
 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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