1 files changed, 10 insertions, 2 deletions
diff --git a/block/nbd.c b/block/nbd.c
index 1b0e384c39..e0af5b4725 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -151,10 +151,18 @@ static void nbd_reply_ready(void *opaque)
 {
     BDRVNBDState *s = opaque;
     uint64_t i;
+    int ret;
 
     if (s->reply.handle == 0) {
-        /* No reply already in flight.  Fetch a header.  */
-        if (nbd_receive_reply(s->sock, &s->reply) < 0) {
+        /* No reply already in flight.  Fetch a header.  It is possible
+         * that another thread has done the same thing in parallel, so
+         * the socket is not readable anymore.
+         */
+        ret = nbd_receive_reply(s->sock, &s->reply);
+        if (ret == -EAGAIN) {
+            return;
+        }
+        if (ret < 0) {
             s->reply.handle = 0;
             goto fail;
         }