[PATCH] tests/qtest/libqtest: Do not overwrite child coredump

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

We are interested by the coredump of the child, not the qtest
parent. If the child generated a coredump, simply call
exit(EXIT_FAILURE) in the parent to avoid overwriting the
child coredump.

Fixes: 71a268a5fd ("tests/libqtest: Improve kill_qemu()")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 tests/qtest/libqtest.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 49075b55a1..bd85d01145 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -173,7 +173,12 @@ static void kill_qemu(QTestState *s)
         fprintf(stderr, "%s:%d: kill_qemu() detected QEMU death "
                 "from signal %d (%s)%s\n",
                 __FILE__, __LINE__, sig, signame, dump);
-        abort();
+        if (WCOREDUMP(wstatus)) {
+            /* Preserve child coredump */
+            exit(1);
+        } else {
+            abort();
+        }
     }
 }
 
-- 
2.21.3