==================================================================
BUG: KCSAN: data-race in can_receive / can_receive

read-write to 0xffff8881168cc408 of 8 bytes by interrupt on cpu 1:
 can_receive+0x4e/0x1f0 net/can/af_can.c:649
 canfd_rcv+0xe7/0x180 net/can/af_can.c:702
 __netif_receive_skb_one_core net/core/dev.c:5670 [inline]
 __netif_receive_skb+0x123/0x280 net/core/dev.c:5783
 process_backlog+0x22e/0x440 net/core/dev.c:6115
 __napi_poll+0x63/0x3c0 net/core/dev.c:6779
 napi_poll net/core/dev.c:6848 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:6970
 handle_softirqs+0xbf/0x280 kernel/softirq.c:554
 run_ksoftirqd+0x1c/0x30 kernel/softirq.c:927
 smpboot_thread_fn+0x31c/0x4c0 kernel/smpboot.c:164
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read-write to 0xffff8881168cc408 of 8 bytes by interrupt on cpu 0:
 can_receive+0x4e/0x1f0 net/can/af_can.c:649
 canfd_rcv+0xe7/0x180 net/can/af_can.c:702
 __netif_receive_skb_one_core net/core/dev.c:5670 [inline]
 __netif_receive_skb+0x123/0x280 net/core/dev.c:5783
 process_backlog+0x22e/0x440 net/core/dev.c:6115
 __napi_poll+0x63/0x3c0 net/core/dev.c:6779
 napi_poll net/core/dev.c:6848 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:6970
 handle_softirqs+0xbf/0x280 kernel/softirq.c:554
 do_softirq+0x5e/0x90 kernel/softirq.c:455
 __local_bh_enable_ip+0x6e/0x70 kernel/softirq.c:382
 __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:396 [inline]
 batadv_nc_purge_paths+0x220/0x270 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x402/0xad0 net/batman-adv/network-coding.c:722
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000000983 -> 0x0000000000000984

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 28 Comm: kworker/u8:1 Tainted: G        W          6.12.0-syzkaller #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: bat_events batadv_nc_worker
==================================================================