File abort-fork-lock-init.patch of Package glibc

From fd18059c0fcf5568db3688da47403b663cf91c5e Mon Sep 17 00:00:00 2001
From: Davide Cavalca <davide@cavalca.name>
Date: Thu, 31 Jul 2025 17:32:58 +0200
Subject: [PATCH] stdlib: resolve a double lock init issue after fork [BZ
 #32994]

The __abort_fork_reset_child (introduced in
d40ac01cbbc66e6d9dbd8e3485605c63b2178251) call resets the lock after the
fork. This causes a DRD regression in valgrind
(https://bugs.kde.org/show_bug.cgi?id=503668), as it's effectively a
double initialization, despite it being actually ok in this case. As
suggested in https://sourceware.org/bugzilla/show_bug.cgi?id=32994#c2
we replace it here with a memcpy of another initialized lock instead,
which makes valgrind happy.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit d9a348d0927c7a1aec5caf3df3fcd36956b3eb23)
---
 NEWS           | 2 +-
 stdlib/abort.c | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/stdlib/abort.c b/stdlib/abort.c
index caa9e6dc04..904244a2fb 100644
--- a/stdlib/abort.c
+++ b/stdlib/abort.c
@@ -19,6 +19,7 @@
 #include <internal-signals.h>
 #include <libc-lock.h>
 #include <pthreadP.h>
+#include <string.h>
 #include <unistd.h>
 
 /* Try to get a machine dependent instruction which will make the
@@ -42,7 +43,10 @@ __libc_rwlock_define_initialized (static, lock);
 void
 __abort_fork_reset_child (void)
 {
-  __libc_rwlock_init (lock);
+  /* Reinitialize lock without calling pthread_rwlock_init, to
+     avoid a valgrind DRD false positive.  */
+  __libc_rwlock_define_initialized (, reset_lock);
+  memcpy (&lock, &reset_lock, sizeof (lock));
 }
 
 void
-- 
2.51.0