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

read-write to 0xffff888101f842e8 of 8 bytes by interrupt on cpu 1:
 deliver net/can/af_can.c:576 [inline]
 can_rcv_filter+0x242/0x4f0 net/can/af_can.c:609
 can_receive+0x163/0x1c0 net/can/af_can.c:666
 can_rcv+0xed/0x190 net/can/af_can.c:690
 __netif_receive_skb_one_core net/core/dev.c:6079 [inline]
 __netif_receive_skb+0x120/0x270 net/core/dev.c:6192
 process_backlog+0x229/0x420 net/core/dev.c:6544
 __napi_poll+0x66/0x310 net/core/dev.c:7594
 napi_poll net/core/dev.c:7657 [inline]
 net_rx_action+0x423/0x8c0 net/core/dev.c:7784
 handle_softirqs+0xba/0x290 kernel/softirq.c:622
 do_softirq+0x5d/0x90 kernel/softirq.c:523
 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:450
 __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]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:835 [inline]
 nsim_dev_trap_report_work+0x52b/0x630 drivers/net/netdevsim/dev.c:866
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3346
 worker_thread+0x582/0x770 kernel/workqueue.c:3427
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read-write to 0xffff888101f842e8 of 8 bytes by interrupt on cpu 0:
 deliver net/can/af_can.c:576 [inline]
 can_rcv_filter+0x242/0x4f0 net/can/af_can.c:609
 can_receive+0x163/0x1c0 net/can/af_can.c:666
 can_rcv+0xed/0x190 net/can/af_can.c:690
 __netif_receive_skb_one_core net/core/dev.c:6079 [inline]
 __netif_receive_skb+0x120/0x270 net/core/dev.c:6192
 process_backlog+0x229/0x420 net/core/dev.c:6544
 __napi_poll+0x66/0x310 net/core/dev.c:7594
 napi_poll net/core/dev.c:7657 [inline]
 net_rx_action+0x423/0x8c0 net/core/dev.c:7784
 handle_softirqs+0xba/0x290 kernel/softirq.c:622
 do_softirq+0x5d/0x90 kernel/softirq.c:523
 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:450
 __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]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:835 [inline]
 nsim_dev_trap_report_work+0x52b/0x630 drivers/net/netdevsim/dev.c:866
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3346
 worker_thread+0x582/0x770 kernel/workqueue.c:3427
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x0000000000001277 -> 0x0000000000001278

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3443 Comm: kworker/u8:7 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events_unbound nsim_dev_trap_report_work
==================================================================
vcan0: j1939_xtp_rx_dat: no tx connection found
vcan0: j1939_tp_rxtimer: 0xffff88811a6fde00: rx timeout, send abort
vcan0: j1939_tp_rxtimer: 0xffff88811a6fde00: abort rx timeout. Force session deactivation
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog