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

read-write to 0xffff8881045031f0 of 8 bytes by interrupt on cpu 0:
 can_send+0x576/0x5d0 net/can/af_can.c:290
 bcm_can_tx+0x314/0x420 net/can/bcm.c:314
 bcm_tx_timeout_handler+0xdb/0x260
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1755
 hrtimer_run_softirq+0xe4/0x2c0 kernel/time/hrtimer.c:1772
 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 0xffff8881045031f0 of 8 bytes by interrupt on cpu 1:
 can_send+0x576/0x5d0 net/can/af_can.c:290
 bcm_can_tx+0x314/0x420 net/can/bcm.c:314
 bcm_tx_timeout_handler+0xdb/0x260
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1755
 hrtimer_run_softirq+0xe4/0x2c0 kernel/time/hrtimer.c:1772
 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]
 lock_sock_nested+0x10f/0x140 net/core/sock.c:3624
 lock_sock include/net/sock.h:1611 [inline]
 sockopt_lock_sock+0x42/0x50 net/core/sock.c:1131
 do_ip_getsockopt+0xb57/0x11a0 net/ipv4/ip_sockglue.c:1703
 ip_getsockopt+0x5c/0x170 net/ipv4/ip_sockglue.c:1765
 tcp_getsockopt+0xaa/0xe0 net/ipv4/tcp.c:4670
 sock_common_getsockopt+0x5b/0x70 net/core/sock.c:3782
 do_sock_getsockopt+0x1ca/0x260 net/socket.c:2396
 __sys_getsockopt+0x18a/0x200 net/socket.c:2425
 __do_sys_getsockopt net/socket.c:2435 [inline]
 __se_sys_getsockopt net/socket.c:2432 [inline]
 __x64_sys_getsockopt+0x66/0x80 net/socket.c:2432
 x64_sys_call+0x11cd/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:56
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000000004f1 -> 0x00000000000004f2

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4321 Comm: syz-executor 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
==================================================================