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BUG: KCSAN: data-race in br_fdb_update / br_fdb_update

write to 0xffff88812c347ac0 of 8 bytes by interrupt on cpu 0:
 br_fdb_update+0x145/0x3e0 net/bridge/br_fdb.c:867
 br_handle_frame_finish+0x2d3/0xbc0 net/bridge/br_input.c:121
 nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
 br_handle_frame+0x54e/0x7d0 net/bridge/br_input.c:399
 __netif_receive_skb_core+0xa4e/0x1cc0 net/core/dev.c:5372
 __netif_receive_skb_one_core net/core/dev.c:5476 [inline]
 __netif_receive_skb+0x52/0x1b0 net/core/dev.c:5592
 process_backlog+0x23f/0x3b0 net/core/dev.c:5920
 __napi_poll+0x65/0x390 net/core/dev.c:6486
 napi_poll net/core/dev.c:6553 [inline]
 net_rx_action+0x37e/0x730 net/core/dev.c:6664
 __do_softirq+0x158/0x2e3 kernel/softirq.c:571
 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:934
 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff88812c347ac0 of 8 bytes by interrupt on cpu 1:
 br_fdb_update+0x110/0x3e0 net/bridge/br_fdb.c:866
 br_handle_frame_finish+0x2d3/0xbc0 net/bridge/br_input.c:121
 nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
 br_handle_frame+0x54e/0x7d0 net/bridge/br_input.c:399
 __netif_receive_skb_core+0xa4e/0x1cc0 net/core/dev.c:5372
 __netif_receive_skb_one_core net/core/dev.c:5476 [inline]
 __netif_receive_skb+0x52/0x1b0 net/core/dev.c:5592
 process_backlog+0x23f/0x3b0 net/core/dev.c:5920
 __napi_poll+0x65/0x390 net/core/dev.c:6486
 napi_poll net/core/dev.c:6553 [inline]
 net_rx_action+0x37e/0x730 net/core/dev.c:6664
 __do_softirq+0x158/0x2e3 kernel/softirq.c:571
 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:934
 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x000000010004bbcf -> 0x000000010004bbd0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20 Comm: ksoftirqd/1 Not tainted 5.19.0-rc3-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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