igt/gem_ctx_thread/processes: Serialise after forking children

Play nice, especially with the subtest, and wait for the children to
exit before finishing the test. If we don't we end up with a fork bomb
for some unknown reason...

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/gem_ctx_thrash.c b/tests/gem_ctx_thrash.c
index aecbc567..a351bb9d 100644
--- a/tests/gem_ctx_thrash.c
+++ b/tests/gem_ctx_thrash.c
@@ -219,6 +219,7 @@ processes(void)
 			drm_intel_bufmgr_destroy(bufmgr);
 		}
 	}
+	igt_waitchildren();
 
 	for (n = 0; n < num_ctx; n++)
 		close(all_fds[n]);