syzbot

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

write to 0xffff88813c3ebcf4 of 4 bytes by task 20475 on cpu 0:
 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+0x55d/0x1220 net/rxrpc/call_event.c:462
 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:243

read to 0xffff88813c3ebcf4 of 4 bytes by task 20472 on cpu 1:
 rxrpc_send_data+0x951/0x1960 net/rxrpc/sendmsg.c:401
 rxrpc_do_sendmsg+0xbf0/0xc80 net/rxrpc/sendmsg.c:735
 rxrpc_sendmsg+0x413/0x520 net/rxrpc/af_rxrpc.c:627
 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+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000000 -> 0x00000003

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20472 Comm: syz-executor.2 Not tainted 6.8.0-rc6-syzkaller-00194-g17ba56605bfd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================