fix-parallel-worker-hang-v5.patch

diff --git a/src/backend/postmaster/bgworker.c b/src/backend/postmaster/bgworker.c
index beb5e85434..dd22241600 100644
--- a/src/backend/postmaster/bgworker.c
+++ b/src/backend/postmaster/bgworker.c
@@ -753,7 +753,14 @@ StartBackgroundWorker(void)
 		/* Prevent interrupts while cleaning up */
 		HOLD_INTERRUPTS();
 
-		/* Report the error to the server log */
+		/*
+		 * sigsetjmp will have blocked all signals, but we may need to accept
+		 * signals while communicating with our parallel leader.  Once we've
+		 * done HOLD_INTERRUPTS() it should be safe to unblock signals.
+		 */
+		BackgroundWorkerUnblockSignals();
+
+		/* Report the error to the parallel leader and the server log */
 		EmitErrorReport();
 
 		/*