From 077a196501e8e84cbfe5965c3bc99a173c680187 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Mon, 30 Nov 2015 12:05:59 +0100
Subject: Better SIGCHLD handling for #2897 debugging.

---
 src/bio.c   | 1 +
 src/redis.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

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) {
-- 
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