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<title>[187362] trunk/Source/bmalloc</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/187362">187362</a></dd>
<dt>Author</dt> <dd>ggaren@apple.com</dd>
<dt>Date</dt> <dd>2015-07-24 14:29:07 -0700 (Fri, 24 Jul 2015)</dd>
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<h3>Log Message</h3>
<pre>vmmap crash at JavaScriptCore: 0x31cd12f6 (the JavaScript malloc zone enumerator)
https://bugs.webkit.org/show_bug.cgi?id=147274
Reviewed by Anders Carlsson.
It's not really clear why vmmap sometimes fails to read the target
process, but we can avoid a crash when it does. This is useful because
you'll still get all the non-bmalloc data out of the target process,
and bmalloc might not even be relevant to your investigation.
* bmalloc/Zone.cpp:
(bmalloc::remoteRead): Check for failure.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourcebmallocChangeLog">trunk/Source/bmalloc/ChangeLog</a></li>
<li><a href="#trunkSourcebmallocbmallocZonecpp">trunk/Source/bmalloc/bmalloc/Zone.cpp</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunkSourcebmallocChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/ChangeLog (187361 => 187362)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/ChangeLog 2015-07-24 21:08:16 UTC (rev 187361)
+++ trunk/Source/bmalloc/ChangeLog 2015-07-24 21:29:07 UTC (rev 187362)
</span><span class="lines">@@ -1,5 +1,20 @@
</span><span class="cx"> 2015-07-24 Geoffrey Garen <ggaren@apple.com>
</span><span class="cx">
</span><ins>+ vmmap crash at JavaScriptCore: 0x31cd12f6 (the JavaScript malloc zone enumerator)
+ https://bugs.webkit.org/show_bug.cgi?id=147274
+
+ Reviewed by Anders Carlsson.
+
+ It's not really clear why vmmap sometimes fails to read the target
+ process, but we can avoid a crash when it does. This is useful because
+ you'll still get all the non-bmalloc data out of the target process,
+ and bmalloc might not even be relevant to your investigation.
+
+ * bmalloc/Zone.cpp:
+ (bmalloc::remoteRead): Check for failure.
+
+2015-07-24 Geoffrey Garen <ggaren@apple.com>
+
</ins><span class="cx"> JavaScriptCore bmalloc should not register its malloc zone more than once
</span><span class="cx"> https://bugs.webkit.org/show_bug.cgi?id=147273
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocZonecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/Zone.cpp (187361 => 187362)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/Zone.cpp 2015-07-24 21:08:16 UTC (rev 187361)
+++ trunk/Source/bmalloc/bmalloc/Zone.cpp 2015-07-24 21:29:07 UTC (rev 187362)
</span><span class="lines">@@ -30,8 +30,16 @@
</span><span class="cx">
</span><span class="cx"> template<typename T> static void remoteRead(task_t task, memory_reader_t reader, vm_address_t remotePointer, T& result)
</span><span class="cx"> {
</span><del>- void* tmp;
- (*reader)(task, remotePointer, sizeof(T), &tmp);
</del><ins>+ void* tmp = nullptr;
+ kern_return_t error = reader(task, remotePointer, sizeof(T), &tmp);
+
+ // This read sometimes fails for unknown reasons (<rdar://problem/14093757>).
+ // Avoid a crash by skipping the memcpy when this happens.
+ if (error || !tmp) {
+ fprintf(stderr, "bmalloc: error reading remote process: 0x%x\n", error);
+ return;
+ }
+
</ins><span class="cx"> memcpy(&result, tmp, sizeof(T));
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre>
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