Fix issue where fork process deletes the parent pidfile (#8231)

Turns out that when the fork child crashes, the crash log was deleting
the pidfile from the disk (although the parent is still running.

Now we set the pidfile of the fork process to NULL so the fork process
will never deletes it.

(cherry picked from commit 92a483bca2df734aff5caada6c23409ed6256773)

2 files changed, 5 insertions, 1 deletions

diff --git a/src/debug.c b/src/debug.c
index 1ec7c4977..351d749a8 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -1335,7 +1335,7 @@ void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
 );
 
     /* free(messages); Don't call free() with possibly corrupted memory. */
-    if (server.daemonize && server.supervised == 0) unlink(server.pidfile);
+    if (server.daemonize && server.supervised == 0 && server.pidfile) unlink(server.pidfile);
 
     /* Make sure we exit with the right signal at the end. So for instance
      * the core will be dumped if enabled. */
diff --git a/src/server.c b/src/server.c
index 68fa089ac..874b0af91 100644
--- a/src/server.c
+++ b/src/server.c
@@ -4043,6 +4043,10 @@ void closeClildUnusedResourceAfterFork() {
     closeListeningSockets(0);
     if (server.cluster_enabled && server.cluster_config_file_lock_fd != -1)
         close(server.cluster_config_file_lock_fd);  /* don't care if this fails */
+
+    /* Clear server.pidfile, this is the parent pidfile which should not
+     * be touched (or deleted) by the child (on exit / crash) */
+    server.pidfile = NULL;
 }
 
 void memtest(size_t megabytes, int passes);