syzbot

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BUG: KCSAN: data-race in can_receive / can_receive

read-write to 0xffff888108c8e208 of 8 bytes by interrupt on cpu 0:
 can_receive+0x4e/0x1f0 net/can/af_can.c:650
 canfd_rcv+0xe7/0x180 net/can/af_can.c:703
 __netif_receive_skb_one_core net/core/dev.c:5896 [inline]
 __netif_receive_skb+0x123/0x280 net/core/dev.c:6009
 process_backlog+0x22e/0x440 net/core/dev.c:6357
 __napi_poll+0x63/0x3c0 net/core/dev.c:7191
 napi_poll net/core/dev.c:7260 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:7382
 handle_softirqs+0xbf/0x280 kernel/softirq.c:561
 run_ksoftirqd+0x1c/0x30 kernel/softirq.c:950
 smpboot_thread_fn+0x31c/0x4c0 kernel/smpboot.c:164
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read-write to 0xffff888108c8e208 of 8 bytes by interrupt on cpu 1:
 can_receive+0x4e/0x1f0 net/can/af_can.c:650
 canfd_rcv+0xe7/0x180 net/can/af_can.c:703
 __netif_receive_skb_one_core net/core/dev.c:5896 [inline]
 __netif_receive_skb+0x123/0x280 net/core/dev.c:6009
 process_backlog+0x22e/0x440 net/core/dev.c:6357
 __napi_poll+0x63/0x3c0 net/core/dev.c:7191
 napi_poll net/core/dev.c:7260 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:7382
 handle_softirqs+0xbf/0x280 kernel/softirq.c:561
 do_softirq+0x5e/0x90 kernel/softirq.c:462
 __local_bh_enable_ip+0x6e/0x70 kernel/softirq.c:389
 __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:820 [inline]
 nsim_dev_trap_report_work+0x522/0x620 drivers/net/netdevsim/dev.c:851
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3319
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3400
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00000000000007c0 -> 0x00000000000007c1

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 29 Comm: kworker/u8:1 Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound nsim_dev_trap_report_work
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