<html>
<head>
<base href="http://llvm.org/bugs/" />
</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 --- - clang crashes on valid code at -O1 and above on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=18615">18615</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O1 and above on x86_64-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>-New Bugs
</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 crashes when compiling the following testcase at -O1
and above in both 32-bit and 64-bit modes on x86_64-linux-gnu.
This is a regression from clang 3.4.
$ clang-trunk -v
clang version 3.5 (trunk 199196)
Target: x86_64-unknown-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 -O0 small.c
$ clang-3.4 -O1 small.c
$
$ clang-trunk -O1 small.c
clang: /tmp/llvm/include/llvm/ADT/SmallVector.h:140: reference
llvm::SmallVectorTemplateCommon<<anonymous>::Slice, void>::operator[](unsigned
int) [T = <anonymous>::Slice]: Assertion `begin() + idx < end()' failed.
0 clang 0x000000000231e755 llvm::sys::PrintStackTrace(_IO_FILE*) +
37
1 clang 0x000000000231ef43
2 libpthread.so.0 0x00007f0dff446cb0
3 libc.so.6 0x00007f0dfe268425 gsignal + 53
4 libc.so.6 0x00007f0dfe26bb8b abort + 379
5 libc.so.6 0x00007f0dfe2610ee
6 libc.so.6 0x00007f0dfe261192
7 clang 0x0000000001f62b4f
8 clang 0x0000000001f53280
9 clang 0x0000000001f50070
10 clang 0x00000000022365da
llvm::FPPassManager::runOnFunction(llvm::Function&) + 362
11 clang 0x0000000002067c8a
12 clang 0x0000000002236e07
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 999
13 clang 0x00000000008638c3
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) +
6211
14 clang 0x00000000008613d1
15 clang 0x00000000009ebbc3 clang::ParseAST(clang::Sema&, bool, bool)
+ 515
16 clang 0x000000000086022e clang::CodeGenAction::ExecuteAction() +
142
17 clang 0x00000000006cac50 clang::FrontendAction::Execute() + 112
18 clang 0x00000000006a7e4d
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 925
19 clang 0x000000000068eb50
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2880
20 clang 0x0000000000686dc4 cc1_main(char const**, char const**, char
const*, void*) + 692
21 clang 0x000000000068cdb0 main + 9184
22 libc.so.6 0x00007f0dfe25376d __libc_start_main + 237
23 clang 0x0000000000686a49
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -disable-free -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 -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.5 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.5/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/20140124-clang-m32-m64-O2-O3-build-test151153
-ferror-limit 19 -fmessage-length 104 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-slp -o
/tmp/small-dc936b.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 'SROA' on function '@fn1'
clang: error: unable to execute command: Aborted (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.5 (trunk 199196)
Target: x86_64-unknown-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-9eeb1c.c
clang: note: diagnostic msg: /tmp/small-9eeb1c.sh
clang: note: diagnostic msg:
********************
$
--------------------------
int a;
struct S0
{
int f0;
int f1;
int f2;
};
void
fn1 ()
{
int b = -1;
struct S0 f[1];
if (a)
f[0] = f[b];
}
int
main ()
{
fn1 ();
return 0;
}</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>