0001-Fix-the-seg-fault-during-proc-exit.patch

From b6fd0117202dc141abc7fc28a2574ea5934c91fb Mon Sep 17 00:00:00 2001
From: Rahila Syed <rahilasyed.90@gmail.com>
Date: Fri, 21 Nov 2025 15:37:19 +0530
Subject: [PATCH] Fix the seg fault during proc exit

If a process encounters a FATAL error after
acquiring a dshash lock but before releasing it,
and it is not within a transaction, it can lead
to a segmentation fault.
Call LWLockReleaseAll() from shmem_exit()
---
 src/backend/storage/ipc/ipc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/backend/storage/ipc/ipc.c b/src/backend/storage/ipc/ipc.c
index 2704e80b3a7..68cf096514c 100644
--- a/src/backend/storage/ipc/ipc.c
+++ b/src/backend/storage/ipc/ipc.c
@@ -29,6 +29,7 @@
 #endif
 #include "storage/dsm.h"
 #include "storage/ipc.h"
+#include "storage/lwlock.h"
 #include "tcop/tcopprot.h"
 
 
@@ -229,6 +230,14 @@ shmem_exit(int code)
 {
 	shmem_exit_inprogress = true;
 
+	/*
+	 * Make sure we release any pending locks so that any callbacks called
+	 * subsequently do not fail to acquire any locks. This also fixes a seg
+	 * fault due to releasing a dshash lock after the dsm segment containing
+	 * the lock has been detached by dsm_backend_shutdown().
+	 */
+	LWLockReleaseAll();
+
 	/*
 	 * Call before_shmem_exit callbacks.
 	 *
-- 
2.34.1