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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 --- - cfl-aa with -O1 segfaults binary"
href="https://llvm.org/bugs/show_bug.cgi?id=28401">28401</a>
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</tr>
<tr>
<th>Summary</th>
<td>cfl-aa with -O1 segfaults binary
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>matthias.krueger@famsik.de
</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>Created <span class=""><a href="attachment.cgi?id=16683" name="attach_16683" title="code snippet">attachment 16683</a> <a href="attachment.cgi?id=16683&action=edit" title="code snippet">[details]</a></span>
code snippet
This original code I found this bug with is
<a href="https://github.com/danmar/cppcheck/blob/e795eef4651ea3db8b60498da2e3608bf5b44aeb/tools/dmake.cpp">https://github.com/danmar/cppcheck/blob/e795eef4651ea3db8b60498da2e3608bf5b44aeb/tools/dmake.cpp</a>
I tried to reduce this (code attached).
llvm was at bafbf2b643f118fd2ea402ed6cd204281c7e9e94
clang was at 0cf7afc057e83969413f10f3817eb107ac8a0933
(using the github llvm-mirror repos)
I compiled with
clang++ -std=c++0x -mllvm -use-cfl-aa -mllvm -use-cfl-aa-in-codegen -O1 -o
crash code.cpp
which will cause the binary to crash.
Omitting -O1 will prevent the crash.
A debug build
clang++ -std=c++0x -mllvm -use-cfl-aa -mllvm -use-cfl-aa-in-codegen
-fsanitize=address -g3 -O1 -o crash code.cpp
revealed this trace:
ASAN:DEADLYSIGNAL
=================================================================
==12120==ERROR: AddressSanitizer: SEGV on unknown address 0x000077000001 (pc
0x7f7ec82d05b3 bp 0x7ffd8fd55fe0 sp 0x7ffd8fd55e78 T0)
==12120==The signal is caused by a READ memory access.
#0 0x7f7ec82d05b2 in std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >::~basic_string()
(/lib64/libstdc++.so.6+0x1235b2)
#1 0x4e95af in void
std::_Destroy_aux<false>::__destroy<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char>
<span class="quote">>*>(std::__cxx11::basic_string<char, std::char_traits<char>,</span >
std::allocator<char> >*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)
/usr/lib/gcc/x86_64-redhat-linux/6.1.1/../../../../include/c++/6.1.1/bits/stl_construct.h:103:6
#2 0x4e91d8 in std::vector<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > > >::~vector()
/usr/lib/gcc/x86_64-redhat-linux/6.1.1/../../../../include/c++/6.1.1/bits/stl_vector.h:426:9
#3 0x4e909e in main /tmp/code.cpp:11:1
#4 0x7f7ec72c2730 in __libc_start_main (/lib64/libc.so.6+0x20730)
#5 0x41a828 in _start (/tmp/crash+0x41a828)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib64/libstdc++.so.6+0x1235b2) in
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>
<span class="quote">>::~basic_string()</span >
==12120==ABORTING
I'm using a fedora 24 system with glibc 2.23.1-8.fc24 and gcc 6.1.1-3.fc24
Kind regards
Matthias Krüger</pre>
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