==================================================================
BUG: KCSAN: data-race in rxrpc_send_data / rxrpc_transmit_some_data

write to 0xffff88810529d8ac of 4 bytes by task 19642 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+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88810529d8ac of 4 bytes by task 19637 on cpu 0:
 rxrpc_send_data+0x93f/0x1950 net/rxrpc/sendmsg.c:405
 rxrpc_do_sendmsg+0xb7a/0xc20 net/rxrpc/sendmsg.c:726
 rxrpc_sendmsg+0x413/0x520 net/rxrpc/af_rxrpc.c:565
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 ____sys_sendmsg+0x375/0x4c0 net/socket.c:2501
 ___sys_sendmsg net/socket.c:2555 [inline]
 __sys_sendmsg+0x1e3/0x270 net/socket.c:2584
 __do_sys_sendmsg net/socket.c:2593 [inline]
 __se_sys_sendmsg net/socket.c:2591 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2591
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x00000003

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19637 Comm: syz-executor.3 Not tainted 6.3.0-rc4-syzkaller-00195-g5a57b48fdfcb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
==================================================================