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BUG: KCSAN: data-race in rxrpc_input_call_event / rxrpc_send_data

write to 0xffff88811a345474 of 4 bytes by task 9303 on cpu 1:
 rxrpc_decant_prepared_tx net/rxrpc/call_event.c:265 [inline]
 rxrpc_transmit_some_data net/rxrpc/call_event.c:295 [inline]
 rxrpc_input_call_event+0x8ef/0x12e0 net/rxrpc/call_event.c:401
 rxrpc_io_thread+0x30e/0x1fb0 net/rxrpc/io_thread.c:478
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff88811a345474 of 4 bytes by task 9302 on cpu 0:
 rxrpc_send_data+0x889/0x1820 net/rxrpc/sendmsg.c:388
 rxrpc_do_sendmsg+0xb92/0xc30 net/rxrpc/sendmsg.c:719
 rxrpc_sendmsg+0x417/0x520 net/rxrpc/af_rxrpc.c:627
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:726
 ____sys_sendmsg+0x312/0x410 net/socket.c:2583
 ___sys_sendmsg net/socket.c:2637 [inline]
 __sys_sendmsg+0x19d/0x230 net/socket.c:2669
 __do_sys_sendmsg net/socket.c:2674 [inline]
 __se_sys_sendmsg net/socket.c:2672 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2672
 x64_sys_call+0x2734/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9302 Comm: syz.0.2017 Not tainted 6.13.0-rc7-syzkaller-00043-g619f0b6fad52 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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