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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 --- - c++11 static thread_local members may cause a segfault when accessed via 'this->'"
href="http://llvm.org/bugs/show_bug.cgi?id=19254">19254</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>c++11 static thread_local members may cause a segfault when accessed via 'this->'
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.4
</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>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>michael@ensslin.cc
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In the following minimal example, f() causes a segfault in the compiled
program, while g() and h() don't.
Note that the error also occurs in g++.
mic@mic-nb $ cat test.cpp
#include <string>
struct A{
static thread_local std::string s;
void f() {
this->s = "segv";
}
void g() {
A::s = "no segv";
}
void h() {
s = "no segv";
}
};
thread_local std::string A::s;
int main() {
A{}.f();
return 0;
}
mic@mic-nb $ g++ -std=c++11 -lpthread test.cpp
mic@mic-nb $ ./a.out
[1] 11729 segmentation fault (core dumped) ./a.out
mic@mic-nb $ clang++ -std=c++11 -lpthread test.cpp
mic@mic-nb $ ./a.out
[1] 11764 segmentation fault (core dumped) ./a.out
Precise versions of installed software:
mic@mic-nb $ g++ --version
g++ (GCC) 4.8.2 20140206 (prerelease)
Copyright (C) 2013 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.
mic@mic-nb $ clang++ --version
clang version 3.4 (tags/RELEASE_34/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
mic@mic-nb $ uname -a
Linux mic-nb 3.13.6-1-ARCH #1 SMP PREEMPT Fri Mar 7 22:47:48 CET 2014 x86_64
GNU/Linux</pre>
</div>
</p>
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