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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __cxa_demangle consumes 6.5Gb on "___Z2i_D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D""
href="https://llvm.org/bugs/show_bug.cgi?id=31031">31031</a>
</td>
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<tr>
<th>Summary</th>
<td>__cxa_demangle consumes 6.5Gb on "___Z2i_D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D"
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kcc@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Feed "___Z2i_D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D"
into __cxa_demangle and watch it consume 6.5 Gb of RAM:
#include <stddef.h>
extern "C" char *
__cxa_demangle(const char *mangled_name, char *buf, size_t *n, int *status);
int main() {
__cxa_demangle("___Z2i_D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D",
0, 0, 0);
}
clang++ -std=c++11 -g cxa_demangle.cpp -I../include repro.cc -o repro
/usr/bin/time ./repro
8.55user 2.41system 0:10.98elapsed 99%CPU (0avgtext+0avgdata
6557996maxresident)k
(found by libFuzzer, see also
<a href="https://bugs.chromium.org/p/chromium/issues/detail?id=606626">https://bugs.chromium.org/p/chromium/issues/detail?id=606626</a>)</pre>
</div>
</p>
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