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<head>
<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - libFuzzer 3.8 fails with "illegal hardware instruction""
href="https://llvm.org/bugs/show_bug.cgi?id=28890">28890</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>libFuzzer 3.8 fails with "illegal hardware instruction"
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</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>sylvestre@debian.org
</td>
</tr>
<tr>
<th>CC</th>
<td>jack.lloyd@gmail.com, llvm-bugs@lists.llvm.org, vonosmas@gmail.com
</td>
</tr>
<tr>
<th>Depends on</th>
<td>25991
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Trying the example with llvm 3.8:
<a href="http://llvm.org/docs/LibFuzzer.html">http://llvm.org/docs/LibFuzzer.html</a>
$ apt-get install libfuzzer-3.8-dev clang-3.8
[..]
$ cat << EOF > test_fuzzer.cc
#include <stdint.h>
#include <stddef.h>
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
if (size > 0 && data[0] == 'H')
if (size > 1 && data[1] == 'I')
if (size > 2 && data[2] == '!')
__builtin_trap();
return 0;
}
EOF
$ clang++-3.8 -fsanitize=address -fsanitize-coverage=edge test_fuzzer.cc
/usr/lib/llvm-3.8/lib/libFuzzer.a
$ ./a.out
Seed: 2980367726
PreferSmall: 1
#0 READ units: 1 exec/s: 0
#1 INITED cov: 2 units: 1 exec/s: 0
#2 NEW cov: 3 units: 2 exec/s: 0 L: 64 MS: 0
#657 NEW cov: 4 units: 3 exec/s: 0 L: 64 MS: 0
#1070 NEW cov: 5 units: 4 exec/s: 0 L: 1 MS: 4
ShuffleBytes-ChangeByte-EraseByte-CrossOver-
#4893 NEW cov: 6 units: 5 exec/s: 0 L: 2 MS: 2 CrossOver-ChangeBit-
#5577 NEW cov: 7 units: 6 exec/s: 0 L: 50 MS: 1 CrossOver-
zsh: illegal hardware instruction ./a.out
reported here:
<a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=833563">https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=833563</a></pre>
</div>
</p>
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