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

write to 0xffff888107b53800 of 8 bytes by task 6466 on cpu 1:
 rxrpc_alloc_txqueue net/rxrpc/sendmsg.c:295 [inline]
 rxrpc_send_data+0x797/0x1570 net/rxrpc/sendmsg.c:398
 rxrpc_do_sendmsg+0xc1b/0xcd0 net/rxrpc/sendmsg.c:769
 rxrpc_sendmsg+0x417/0x520 net/rxrpc/af_rxrpc.c:627
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:733
 ____sys_sendmsg+0x326/0x4b0 net/socket.c:2573
 ___sys_sendmsg net/socket.c:2627 [inline]
 __sys_sendmsg+0x19d/0x230 net/socket.c:2659
 __do_sys_sendmsg net/socket.c:2664 [inline]
 __se_sys_sendmsg net/socket.c:2662 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2662
 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

read to 0xffff888107b53800 of 8 bytes by task 6468 on cpu 0:
 rxrpc_prepare_data_packet net/rxrpc/output.c:566 [inline]
 rxrpc_send_data_packet+0x473/0x2030 net/rxrpc/output.c:664
 rxrpc_transmit_fresh_data net/rxrpc/call_event.c:255 [inline]
 rxrpc_transmit_some_data+0x658/0x920 net/rxrpc/call_event.c:277
 rxrpc_input_call_event+0x90b/0x1360 net/rxrpc/call_event.c:401
 rxrpc_io_thread+0x1d33/0x22c0 net/rxrpc/io_thread.c:534
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000000000 -> 0xffff888107b57800

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 6468 Comm: krxrpcio/0 Not tainted 6.14.0-rc5-syzkaller-00016-g48a5eed9ad58 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================