Better SIGCHLD handling for #2897 debugging.waitpid-fix

2 files changed, 3 insertions, 1 deletions

diff --git a/src/bio.c b/src/bio.c
index 4bd5a17c6..66e1afd7f 100644
--- a/src/bio.c
+++ b/src/bio.c
@@ -152,6 +152,7 @@ void *bioProcessBackgroundJobs(void *arg) {
      * receive the watchdog signal. */
     sigemptyset(&sigset);
     sigaddset(&sigset, SIGALRM);
+    sigaddset(&sigset, SIGCHLD);
     if (pthread_sigmask(SIG_BLOCK, &sigset, NULL))
         redisLog(REDIS_WARNING,
             "Warning: can't mask SIGALRM in bio.c thread: %s", strerror(errno));
diff --git a/src/redis.c b/src/redis.c
index 3afe1601d..203d8d780 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -1761,7 +1761,8 @@ void initServer(void) {
     int j;
 
     signal(SIGHUP, SIG_IGN);
-    signal(SIGPIPE, SIG_IGN);
+    signal(SIGPIPE, SIG_IGN); /* No write(2) generated signals. */
+    signal(SIGCHLD, SIG_DFL); /* We want zombies to queue for waitpid(). */
     setupSignalHandlers();
 
     if (server.syslog_enabled) {