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BUG: KCSAN: data-race in can_receive / can_receive

read-write to 0xffff888116addc68 of 8 bytes by interrupt on cpu 1:
 can_receive+0x62/0x1f0 net/can/af_can.c:651
 canfd_rcv+0xe7/0x180 net/can/af_can.c:703
 __netif_receive_skb_one_core net/core/dev.c:5893 [inline]
 __netif_receive_skb+0x123/0x280 net/core/dev.c:6006
 process_backlog+0x22e/0x440 net/core/dev.c:6354
 __napi_poll+0x63/0x3c0 net/core/dev.c:7188
 napi_poll net/core/dev.c:7257 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:7379
 handle_softirqs+0xbf/0x280 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:662
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x73/0x80 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 __cond_resched+0x0/0x90
 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 0xffff888116addc68 of 8 bytes by interrupt on cpu 0:
 can_receive+0x62/0x1f0 net/can/af_can.c:651
 canfd_rcv+0xe7/0x180 net/can/af_can.c:703
 __netif_receive_skb_one_core net/core/dev.c:5893 [inline]
 __netif_receive_skb+0x123/0x280 net/core/dev.c:6006
 process_backlog+0x22e/0x440 net/core/dev.c:6354
 __napi_poll+0x63/0x3c0 net/core/dev.c:7188
 napi_poll net/core/dev.c:7257 [inline]
 net_rx_action+0x3a1/0x7f0 net/core/dev.c:7379
 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
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline]
 copy_fpstate_to_sigframe+0x31d/0x7e0 arch/x86/kernel/fpu/signal.c:234
 get_sigframe+0x2f3/0x430 arch/x86/kernel/signal.c:163
 x64_setup_rt_frame+0xad/0x590 arch/x86/kernel/signal_64.c:175
 setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
 handle_signal arch/x86/kernel/signal.c:294 [inline]
 arch_do_signal_or_restart+0x287/0x4b0 arch/x86/kernel/signal.c:339
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x62/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000000000083d -> 0x000000000000083e

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3308 Comm: syz-executor Not tainted 6.14.0-rc5-syzkaller-00016-g48a5eed9ad58 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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