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

read-write to 0xffff88811af36ff0 of 8 bytes by interrupt on cpu 1:
 can_send+0x5b6/0x6d0 net/can/af_can.c:291
 bcm_can_tx+0x314/0x420 net/can/bcm.c:314
 bcm_tx_timeout_handler+0xea/0x280
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1865
 hrtimer_run_softirq+0xe4/0x2c0 kernel/time/hrtimer.c:1882
 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]
 release_sock+0x117/0x150 net/core/sock.c:3686
 sockopt_release_sock+0x42/0x50 net/core/sock.c:1142
 do_ip_getsockopt+0xd4a/0x1270 net/ipv4/ip_sockglue.c:1732
 ip_getsockopt+0x5c/0x170 net/ipv4/ip_sockglue.c:1765
 tcp_getsockopt+0xaa/0xe0 net/ipv4/tcp.c:4684
 sock_common_getsockopt+0x5b/0x70 net/core/sock.c:3827
 do_sock_getsockopt+0x1ca/0x260 net/socket.c:2364
 __sys_getsockopt net/socket.c:2393 [inline]
 __do_sys_getsockopt net/socket.c:2400 [inline]
 __se_sys_getsockopt net/socket.c:2397 [inline]
 __x64_sys_getsockopt+0x18c/0x200 net/socket.c:2397
 x64_sys_call+0x1288/0x2dc0 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

read-write to 0xffff88811af36ff0 of 8 bytes by interrupt on cpu 0:
 can_send+0x5b6/0x6d0 net/can/af_can.c:291
 bcm_can_tx+0x314/0x420 net/can/bcm.c:314
 bcm_tx_timeout_handler+0xea/0x280
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1865
 hrtimer_run_softirq+0xe4/0x2c0 kernel/time/hrtimer.c:1882
 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]
 batadv_nc_purge_paths+0x220/0x270 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x3db/0xad0 net/batman-adv/network-coding.c:720
 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: 0x00000000000023da -> 0x00000000000023db

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 10386 Comm: kworker/u8:33 Not tainted 6.14.0-rc4-syzkaller-00199-g76544811c850 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: bat_events batadv_nc_worker
==================================================================