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BUG: KCSAN: data-race in process_one_work / process_one_work

read-write to 0xffff8881000660a0 of 8 bytes by task 1636 on cpu 0:
 process_one_work+0x45f/0x860 kernel/workqueue.c:2606
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2751
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read-write to 0xffff8881000660a0 of 8 bytes by task 25 on cpu 1:
 process_one_work+0x45f/0x860 kernel/workqueue.c:2606
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2751
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x0000000000000d32 -> 0x0000000000000d33

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25 Comm: kworker/u4:1 Not tainted 6.5.0-rc7-syzkaller-00004-gf7757129e3de #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: events_unbound macvlan_process_broadcast
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batman_adv: batadv2: No IGMP Querier present - multicast optimizations disabled
batman_adv: batadv2: No MLD Querier present - multicast optimizations disabled
batman_adv: batadv3: No IGMP Querier present - multicast optimizations disabled
batman_adv: batadv3: No MLD Querier present - multicast optimizations disabled