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BUG: KCSAN: data-race in rxrpc_send_data / rxrpc_transmit_some_data

write to 0xffff888103165c1c of 4 bytes by task 12664 on cpu 1:
 rxrpc_decant_prepared_tx net/rxrpc/call_event.c:283 [inline]
 rxrpc_transmit_some_data+0x2f1/0x410 net/rxrpc/call_event.c:311
 rxrpc_input_call_event+0x417/0xf70 net/rxrpc/call_event.c:415
 rxrpc_io_thread+0x3e6/0x810 net/rxrpc/io_thread.c:448
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff888103165c1c of 4 bytes by task 12663 on cpu 0:
 rxrpc_send_data+0x6dd/0xbb0 net/rxrpc/sendmsg.c:342
 rxrpc_do_sendmsg+0xb5d/0xc00 net/rxrpc/sendmsg.c:672
 rxrpc_sendmsg+0x3f6/0x500 net/rxrpc/af_rxrpc.c:562
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x38f/0x500 net/socket.c:2476
 ___sys_sendmsg net/socket.c:2530 [inline]
 __sys_sendmsg+0x19a/0x230 net/socket.c:2559
 __do_sys_sendmsg net/socket.c:2568 [inline]
 __se_sys_sendmsg net/socket.c:2566 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2566
 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+0x63/0xcd

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12663 Comm: syz-executor.3 Tainted: G        W          6.1.0-syzkaller-14321-g0a924817d2ed-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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