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BUG: KCSAN: data-race in bcm_connect / bcm_sendmsg

write to 0xffff888120fcbf00 of 4 bytes by task 24239 on cpu 0:
 bcm_connect+0x205/0x2b0 net/can/bcm.c:1683
 __sys_connect_file net/socket.c:2048 [inline]
 __sys_connect+0x1a9/0x1c0 net/socket.c:2065
 __do_sys_connect net/socket.c:2075 [inline]
 __se_sys_connect net/socket.c:2072 [inline]
 __x64_sys_connect+0x41/0x50 net/socket.c:2072
 x64_sys_call+0x2929/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888120fcbf00 of 4 bytes by task 24241 on cpu 1:
 bcm_sendmsg+0x6b/0x470 net/can/bcm.c:1345
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:745
 ____sys_sendmsg+0x312/0x410 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x1e9/0x280 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674
 x64_sys_call+0xae9/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24241 Comm: syz-executor.3 Tainted: G        W          6.9.0-rc3-syzkaller-00286-g5939d45155bb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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