From 27aa2e5841d5b617b1e81fc6a8b9cec897295289 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Thu, 16 Jul 2020 20:55:41 +0200
Subject: [PATCH] UserspaceEmulator: Reset malloc backtrace on mallocation
 reuse

If a previously-freed malloc chunk is reused, forget any old backtraces
and save a new malloc backtrace.
---
 DevTools/UserspaceEmulator/MallocTracer.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/DevTools/UserspaceEmulator/MallocTracer.cpp b/DevTools/UserspaceEmulator/MallocTracer.cpp
index 72c183d99a..6d5ffdbcc7 100644
--- a/DevTools/UserspaceEmulator/MallocTracer.cpp
+++ b/DevTools/UserspaceEmulator/MallocTracer.cpp
@@ -45,6 +45,8 @@ void MallocTracer::target_did_malloc(Badge<SoftCPU>, FlatPtr address, size_t siz
         ASSERT(existing_mallocation->freed);
         existing_mallocation->size = size;
         existing_mallocation->freed = false;
+        existing_mallocation->malloc_backtrace = Emulator::the().raw_backtrace();
+        existing_mallocation->free_backtrace.clear();
         return;
     }
     m_mallocations.append({ address, size, false, Emulator::the().raw_backtrace(), Vector<FlatPtr>() });