[Qemu-devel] [PATCH V2 1/2] tests/libqtest: Fix possible deadlock in qtest initialization

[Marcel Apfelbaum <marcel.a@redhat.com>]

'socket_accept' waits for Qemu to init its unix socket.
If Qemu encounters an error during command line parsing,
it can exit before initializing the communication channel.

Using a timeout for sockets fixes the issue.

Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
---
 tests/libqtest.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/tests/libqtest.c b/tests/libqtest.c
index f587d36..f1ba254 100644
--- a/tests/libqtest.c
+++ b/tests/libqtest.c
@@ -34,6 +34,7 @@
 #include "qapi/qmp/json-parser.h"
 
 #define MAX_IRQ 256
+#define SOCKET_TIMEOUT 5
 
 QTestState *global_qtest;
 
@@ -78,12 +79,16 @@ static int socket_accept(int sock)
     struct sockaddr_un addr;
     socklen_t addrlen;
     int ret;
+    struct timeval timeout = { .tv_sec = SOCKET_TIMEOUT,
+                               .tv_usec = 0 };
+
+    setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *)&timeout,
+               sizeof(timeout));
 
     addrlen = sizeof(addr);
     do {
         ret = accept(sock, (struct sockaddr *)&addr, &addrlen);
     } while (ret == -1 && errno == EINTR);
-    g_assert_no_errno(ret);
     close(sock);
 
     return ret;
@@ -91,7 +96,7 @@ static int socket_accept(int sock)
 
 static void kill_qemu(QTestState *s)
 {
-    if (s->qemu_pid != -1) {
+    if (s && s->qemu_pid != -1) {
         kill(s->qemu_pid, SIGTERM);
         waitpid(s->qemu_pid, NULL, 0);
     }
@@ -153,6 +158,8 @@ QTestState *qtest_init(const char *extra_args)
     g_free(socket_path);
     g_free(qmp_socket_path);
 
+    g_assert(s->fd >= 0 && s->qmp_fd >= 0);
+
     s->rx = g_string_new("");
     for (i = 0; i < MAX_IRQ; i++) {
         s->irq_level[i] = false;
-- 
1.8.3.1