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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - include/c++/v1/__debug:259 : ubsan reports an error with _LIBCPP_DEBUG=1."
href="https://bugs.llvm.org/show_bug.cgi?id=39203">39203</a>
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<tr>
<th>Summary</th>
<td>include/c++/v1/__debug:259 : ubsan reports an error with _LIBCPP_DEBUG=1.
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>7.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
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<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pawel_sikora@zoho.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>#include <vector>
int main()
{
std::vector< int > v;
return 0;
}
$ clang++ -Wall -g2 -fsanitize=undefined -D_LIBCPP_DEBUG=1 -stdlib=libc++ t.cpp
-o t
$ ./t
(...)/include/c++/v1/__debug:259:40: runtime error: member access within
address 0x0000028a02b0 which does not point to an object of type
'std::__1::__c_node'
0x0000028a02b0: note: object has invalid vptr
00 00 00 00 00 00 00 00 00 00 00 00 08 27 31 f7 fc 7f 00 00 00 00 00 00 00
00 00 00 00 00 00 00
^~~~~~~~~~~~~~~~~~~~~~~
invalid vptr
(...)/include/c++/v1/__debug:259:51: runtime error: member access within
address 0x0000028a02b0 which does not point to an object of type
'std::__1::__c_node'
0x0000028a02b0: note: object has invalid vptr
00 00 00 00 00 00 00 00 00 00 00 00 08 27 31 f7 fc 7f 00 00 00 00 00 00 00
00 00 00 00 00 00 00
^~~~~~~~~~~~~~~~~~~~~~~
invalid vptr</pre>
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