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<base href="https://bugs.webkit.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion failure when redefining array length"
href="https://bugs.webkit.org/show_bug.cgi?id=158791">158791</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Assertion failure when redefining array length
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>WebKit Local Build
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>OS</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>Normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P2
</td>
</tr>
<tr>
<th>Component</th>
<td>JavaScriptCore
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>andre.bargull@gmail.com
</td>
</tr></table>
<p>
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<pre>SVN: rev202088
Build with: perl Tools/Scripts/build-jsc --gtk --debug
The following test case triggers this assertion error:
---
ASSERTION FAILED: isLengthWritable() || !writable
---
Test case:
---
var a = [];
Object.defineProperty(a, "length", {
writable: true,
value: {
valueOf() {
Object.defineProperty(a, "length", {writable: false});
return 0;
}
}
});
---
Stack trace:
---
#0 0x00007ffff6de7098 in WTFCrash () at ../../Source/WTF/wtf/Assertions.cpp:317
#1 0x00007ffff6b8f827 in JSC::JSArray::setLengthWritable (this=0x7fffaf1c7ed0, exec=0x7fffffffcb20, writable=true)
at ../../Source/JavaScriptCore/runtime/JSArray.cpp:65
#2 0x00007ffff6b8fc31 in JSC::JSArray::defineOwnProperty (object=0x7fffaf1c7ed0, exec=0x7fffffffcb20, propertyName=..., descriptor=..., throwException=true)
at ../../Source/JavaScriptCore/runtime/JSArray.cpp:118
#3 0x00007ffff6c8d2f2 in JSC::objectConstructorDefineProperty (exec=0x7fffffffcb20) at ../../Source/JavaScriptCore/runtime/ObjectConstructor.cpp:433
#4 0x00007fffb0bff028 in ?? ()
#5 0x00007fffffffcba0 in ?? ()
#6 0x00007ffff69f26a1 in llint_entry () at ../../Source/JavaScriptCore/runtime/JSCJSValueInlines.h:1054
---</pre>
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