Otherwise the error is just

    error: Failed to create domain from test1.xml
    error: failed to retrieve file descriptor for interface: Transport endpoint 
is not connected

since we don't get a sensible error after the fork.
---
 src/qemu/qemu_command.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 5a92ad4..bddc955 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -295,6 +295,12 @@ static int 
qemuCreateInBridgePortWithHelper(virQEMUDriverConfigPtr cfg,
         return -1;
     }
 
+    if (!virFileIsExecutable(cfg->bridgeHelperName)) {
+        virReportSystemError(errno, _("'%s' not a suitable bridge helper"),
+                             cfg->bridgeHelperName);
+        return -1;
+    }
+
     cmd = virCommandNew(cfg->bridgeHelperName);
     if (flags & VIR_NETDEV_TAP_CREATE_VNET_HDR)
         virCommandAddArgFormat(cmd, "--use-vnet");
-- 
2.1.4

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