[BUG] When Server's io-threads > 1 and large data is transferred over RDMA, the server gets stuck in an endless loop

[fengquyoumo]

Describe the bug

When Server's io-threads > 1 and large data is transferred over RDMA, the server gets stuck in an endless loop

To reproduce

Run Server

./src/valkey-server \
    --port 6379 \
    --protected-mode no \
    --appendonly no \
    --loglevel notice \
    --loadmodule src/valkey-rdma.so bind=<your host> port=6380 \
    --server_cpulist 0-31:2 \
    --bgsave_cpulist 96-127:2 \
    --io-threads 8

Run redis-benchmark with rdma (provided by @pizhenwei)
You may need to modify the code before running it

diff --git a/src/redis-benchmark.c b/src/redis-benchmark.c
index a77565526..390d33b6b 100644
--- a/src/redis-benchmark.c
+++ b/src/redis-benchmark.c
@@ -636,6 +636,9 @@ static void writeHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
                         fprintf(stderr, "Error writing to the server: %s\n", strerror(errno));
                     freeClient(c);
                     return;
+                } else if (nwritten > 0) {
+                    c->written += nwritten;
+                    return;
                 }
             } else {
                 aeDeleteFileEvent(el,c->context->fd,AE_WRITABLE);

and then run

./src/redis-benchmark \
    -h <your host> \
    -n 10000000 \
    -r 100 \
    -t set \
    -p 6380 \
    -d 10485760  \
    -c 50 \
    --threads 16 \
    --rdma

Expected behavior

Get a benchmark report as usual

Actual behavior

Main thread of Server run 100% cpu, and redis-benchmark waits

Additional information

I am a newcomer, please bear with me for my English level and description ability