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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Strange false positive with address sanitizer"
href="http://llvm.org/bugs/show_bug.cgi?id=19938">19938</a>
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<th>Summary</th>
<td>Strange false positive with address sanitizer
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.4
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>sstewartgallus00@mylangara.bc.ca
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12601" name="attach_12601" title="A very strange testcase that gives a false positive">attachment 12601</a> <a href="attachment.cgi?id=12601&action=edit" title="A very strange testcase that gives a false positive">[details]</a></span>
A very strange testcase that gives a false positive
So this might be some bug with X11 or GLibc but anyways attached is a very
strange case that generates a false positive for address sanitizer.
I really wish I could reduce this testcase past using X11.
Annoyingly, Valgrind doesn't seem to complain so there's not an obvious error.
To build it compile as clang -g -fsanitize=address-full clang-sanitizer.c -lX11
-pthread
Some system information:
<span class="quote">> uname -a</span >
Linux alonzo 3.13.0-24-generic #1trisquel1 SMP Tue May 13 15:17:50 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
<span class="quote">> /lib/x86_64-linux-gnu/libc.so.6</span >
GNU C Library (Ubuntu EGLIBC 2.15-0ubuntu10.5) stable release version 2.15, by
Roland McGrath et al.
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.6.3.
Compiled on a Linux 3.2.50 system on 2013-09-30.
Available extensions:
crypt add-on version 2.1 by Michael Glad and others
GNU Libidn by Simon Josefsson
Native POSIX Threads Library by Ulrich Drepper et al
BIND-8.2.3-T5B
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
<<a href="http://www.debian.org/Bugs/">http://www.debian.org/Bugs/</a>>.
The version of X11 is 2:1.4.99.1-0ub.</pre>
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