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BUG: KCSAN: data-race in rxrpc_send_data / rxrpc_transmit_some_data

write to 0xffff88813e871474 of 4 bytes by task 12767 on cpu 1:
 rxrpc_decant_prepared_tx net/rxrpc/call_event.c:320 [inline]
 rxrpc_transmit_some_data+0x37d/0x600 net/rxrpc/call_event.c:350
 rxrpc_input_call_event+0x564/0x1220 net/rxrpc/call_event.c:464
 rxrpc_io_thread+0x307/0x1d80 net/rxrpc/io_thread.c:461
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

read to 0xffff88813e871474 of 4 bytes by task 12764 on cpu 0:
 rxrpc_send_data+0x951/0x1960 net/rxrpc/sendmsg.c:401
 rxrpc_do_sendmsg+0xba8/0xc40 net/rxrpc/sendmsg.c:726
 rxrpc_sendmsg+0x413/0x520 net/rxrpc/af_rxrpc.c:581
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x1e9/0x270 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
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12764 Comm: syz-executor.4 Not tainted 6.7.0-rc4-syzkaller-00358-gf2e8a57ee903 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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