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<head>
<base href="http://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 --- - clang segfaults at -O3 on x86_64-pc-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=17308">17308</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang segfaults at -O3 on x86_64-pc-linux-gnu
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>su@cs.ucdavis.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The current clang trunk segfaults when compiling the following testcase at -O3
(in both 32-bit and 64-bit modes) on x86_64-pc-linux-gnu.
This is a regression from clang 3.3.
It may be the same as or related to 17307, but 17307 also segfaults at -O2.
$ clang-trunk -v
clang version 3.4 (trunk 191074)
Target: x86_64-pc-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
$
$ clang-trunk -O2 -c small.c
$
$ clang-trunk -O3 -c small.c
0 clang 0x0000000001c5e495 llvm::sys::PrintStackTrace(_IO_FILE*) +
37
1 clang 0x0000000001c5e8e3
2 libpthread.so.0 0x00007f59d8bbdcb0
3 clang 0x00000000018f5d93
4 clang 0x0000000001c06edb
llvm::FPPassManager::runOnFunction(llvm::Function&) + 315
5 clang 0x0000000001a16a60
6 clang 0x0000000001c07336
llvm::MPPassManager::runOnModule(llvm::Module&) + 406
7 clang 0x0000000001c07bc0 llvm::PassManagerImpl::run(llvm::Module&)
+ 480
8 clang 0x0000000000806090
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 5728
9 clang 0x0000000000803d1b
10 clang 0x000000000092c143 clang::ParseAST(clang::Sema&, bool, bool)
+ 531
11 clang 0x000000000080324c clang::CodeGenAction::ExecuteAction() +
76
12 clang 0x00000000006a9477 clang::FrontendAction::Execute() + 87
13 clang 0x00000000006889bd
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 813
14 clang 0x000000000067306c
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2956
15 clang 0x000000000066bea8 cc1_main(char const**, char const**, char
const*, void*) + 680
16 clang 0x00000000006715df main + 8095
17 libc.so.6 0x00007f59d79cb76d __libc_start_main + 237
18 clang 0x000000000066bb39
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang -cc1 -triple
x86_64-pc-linux-gnu -emit-obj -disable-free -disable-llvm-verifier
-main-file-name small.c -mrelocation-model static -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version
2.22 -momit-leaf-frame-pointer -coverage-file
/data2/c-hunter-results/C/trans-bugs/20130920-clang-m32-m64-O3-build-test44601/small.o
-resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.4 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.4/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O3 -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/20130920-clang-m32-m64-O3-build-test44601
-ferror-limit 19 -fmessage-length 108 -mstackrealign -fobjc-runtime=gcc
-fobjc-default-synthesize-properties -fdiagnostics-show-option
-fcolor-diagnostics -vectorize-loops -vectorize-slp -o small.o -x c small.c
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'CallGraph Pass Manager' on module 'small.c'.
4. Running pass 'Global Value Numbering' on function '@foo'
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.4 (trunk 191074)
Target: x86_64-pc-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/small-854adf.c
clang: note: diagnostic msg: /tmp/small-854adf.sh
clang: note: diagnostic msg:
********************
$
-------------------------------------
int a, c, d;
static int *b = &a;
int foo ()
{
for (a = 0; a < 1; a++)
;
for (;;)
{
d--;
for (;;)
{
int e[3];
for (c = 0; c < 3; c++)
e[c] = 1;
if (*b)
break;
return e[0];
}
}
}</pre>
</div>
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