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BUG: KCSAN: data-race in bcm_connect / bcm_sendmsg

write to 0xffff8881345ee700 of 4 bytes by task 20201 on cpu 0:
 bcm_connect+0x203/0x2b0 net/can/bcm.c:1621
 __sys_connect_file net/socket.c:1979 [inline]
 __sys_connect+0x197/0x1b0 net/socket.c:1996
 __do_sys_connect net/socket.c:2006 [inline]
 __se_sys_connect net/socket.c:2003 [inline]
 __x64_sys_connect+0x3d/0x50 net/socket.c:2003
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff8881345ee700 of 4 bytes by task 20203 on cpu 1:
 bcm_sendmsg+0x67/0x400 net/can/bcm.c:1283
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x38f/0x500 net/socket.c:2492
 ___sys_sendmsg net/socket.c:2546 [inline]
 __sys_sendmsg+0x197/0x230 net/socket.c:2575
 __do_sys_sendmsg net/socket.c:2584 [inline]
 __se_sys_sendmsg net/socket.c:2582 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2582
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20203 Comm: syz-executor.2 Not tainted 5.19.0-rc3-syzkaller-00048-gde5c208d533a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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