syzbot

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BUG: KCSAN: data-race in rxrpc_send_data / rxrpc_send_data_packet

write to 0xffff88810d458800 of 8 bytes by task 4488 on cpu 1:
 rxrpc_alloc_txqueue net/rxrpc/sendmsg.c:-1 [inline]
 rxrpc_send_data+0x8c5/0x1560 net/rxrpc/sendmsg.c:398
 rxrpc_do_sendmsg+0xc16/0xcc0 net/rxrpc/sendmsg.c:771
 rxrpc_sendmsg+0x47c/0x590 net/rxrpc/af_rxrpc.c:598
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x145/0x180 net/socket.c:742
 ____sys_sendmsg+0x31e/0x4a0 net/socket.c:2592
 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2681
 x64_sys_call+0x17ba/0x3000 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810d458800 of 8 bytes by task 4496 on cpu 0:
 rxrpc_prepare_data_packet net/rxrpc/output.c:566 [inline]
 rxrpc_send_data_packet+0x465/0x1df0 net/rxrpc/output.c:664
 rxrpc_transmit_fresh_data net/rxrpc/call_event.c:255 [inline]
 rxrpc_transmit_some_data+0x63c/0x8b0 net/rxrpc/call_event.c:277
 rxrpc_input_call_event+0x8bb/0xf30 net/rxrpc/call_event.c:401
 rxrpc_io_thread+0x1c1e/0x21c0 net/rxrpc/io_thread.c:550
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

value changed: 0x0000000000000000 -> 0xffff88810d45c800

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4496 Comm: krxrpcio/0 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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