<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - libunwind (SEH on MinGW) : segfault during unwinding"
href="https://bugs.llvm.org/show_bug.cgi?id=39935">39935</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>libunwind (SEH on MinGW) : segfault during unwinding
</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>Windows NT
</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>jeanmichael.celerier@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21209" name="attach_21209" title="code that reproduces the problem">attachment 21209</a> <a href="attachment.cgi?id=21209&action=edit" title="code that reproduces the problem">[details]</a></span>
code that reproduces the problem
Hello,
I originally posted this issue here :
<a href="https://github.com/mstorsjo/llvm-mingw/issues/25">https://github.com/mstorsjo/llvm-mingw/issues/25</a>
The attached repro gives an example which causes a segfault (with the
llvm-mingw toolchain)
The build.sh script will build a code and launch the program in the case which
causes the problem (segfault while unwinding). There are a bunch of files but
the actual stack trace is very short and only spans two files (main.cpp and
parser/sourcereader.cpp):
Thread 1 hit Catchpoint 1 (exception thrown), 0x0000000140010a90 in __cxa_throw
()
(gdb) bt
#0 0x0000000140010a90 in __cxa_throw ()
#1 0x000000014000657d in SourceReader::parseLocal (this=<optimized out>,
fname=<optimized out>) at C:/dev/repro-except/parser\sourcereader.cpp:93
#2 0x0000000140006235 in SourceReader::parseFile (this=<optimized out>,
fname=<optimized out>) at C:/dev/repro-except/parser\sourcereader.cpp:84
#3 0x000000014000c4fa in compileFaustFactory (argc=<optimized out>,
argv=0x524250, name=<optimized out>, dsp_content=<optimized out>,
error_msg=..., generate=<optimized out>)
at C:/dev/repro-except\main.cpp:21
#4 0x000000014000c668 in main (argc=<optimized out>,
argv=0x140012260 <typeinfo for faustexception>)
at C:/dev/repro-except\main.cpp:33
The smallest change to the code path, for instance changing parseLocal from :
Tree SourceReader::parseLocal(const char* fname)
{
stringstream error;
throw faustexception("blah");
return gGlobal->gResult;
}
to
Tree SourceReader::parseLocal(const char* fname)
{
throw faustexception("blah");
return gGlobal->gResult;
}
or removing the untaken if branch in sourcereader.cpp:79, makes the problem go
away.
Also, it works at -O1, it's only starting from -O2 that it fails.
The same code works fine with clang on both linux and macos.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>