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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 crashes on valid code at -O2 and -O3 on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=18861">18861</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O2 and -O3 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 -O2
and -O3 in both 32-bit and 64-bit modes on x86_64-linux-gnu.
This is a regression from clang 3.4.
Perhaps related to the recently fixed 18361?
$ clang-trunk -v
clang version 3.5 (trunk 201494)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
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/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multiilb: .;@m64
Candidate multiilb: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -Os small.c; a.out
$ clang-3.4 -O2 small.c; a.out
$
$ clang-trunk -O2 small.c
clang: /tmp/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:1901: virtual bool
{anonymous}::IndVarSimplify::runOnLoop(llvm::Loop*, llvm::LPPassManager&):
Assertion `L->isLCSSAForm(*DT) && "Indvars did not leave the loop in lcssa
form!"' failed.
0 clang 0x00000000025afbe2 llvm::sys::PrintStackTrace(_IO_FILE*) +
34
1 clang 0x00000000025af749
2 libpthread.so.0 0x00007f4683dfdcb0
3 libc.so.6 0x00007f4682e23425 gsignal + 53
4 libc.so.6 0x00007f4682e26b8b abort + 379
5 libc.so.6 0x00007f4682e1c0ee
6 libc.so.6 0x00007f4682e1c192
7 clang 0x000000000211fc8f
8 clang 0x000000000234942f
llvm::LPPassManager::runOnFunction(llvm::Function&) + 1711
9 clang 0x000000000249a84f
llvm::FPPassManager::runOnFunction(llvm::Function&) + 639
10 clang 0x00000000022b5df6
11 clang 0x000000000249c9cf
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 863
12 clang 0x00000000008c9288
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) +
2840
13 clang 0x00000000008c46fe
14 clang 0x0000000000a6ad62 clang::ParseAST(clang::Sema&, bool, bool)
+ 514
15 clang 0x00000000008c6031 clang::CodeGenAction::ExecuteAction() +
97
16 clang 0x000000000070aa79 clang::FrontendAction::Execute() + 265
17 clang 0x00000000006e83dd
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 349
18 clang 0x00000000006cdff6
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1222
19 clang 0x00000000006c7bc8 cc1_main(char const**, char const**, char
const*, void*) + 1208
20 clang 0x00000000006b297c main + 716
21 libc.so.6 0x00007f4682e0e76d __libc_start_main + 237
22 clang 0x00000000006c68d1
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 -fuse-init-array -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 -O2 -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/REDUCED/20140211-clang-m32-m64-O2-O3-build-test217836
-ferror-limit 19 -fmessage-length 106 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o /tmp/small-ff4ea5.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 'Loop Pass Manager' on function '@fn2'
5. Running pass 'Induction Variable Simplification' on basic block
'%for.cond1thread-pre-split'
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 201494)
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-cb829b.c
clang: note: diagnostic msg: /tmp/small-cb829b.sh
clang: note: diagnostic msg:
********************
$
-----------------------
int a, b, c, d, e, f;
int
fn1 ()
{
f = b;
for (e = 0; e < 2; e++)
{
d = 0;
if (e)
return 0;
}
for (;;)
;
}
void
fn2 ()
{
for (; b; b++)
for (; c; c++)
{
a = 0;
fn1 ();
}
}
int
main ()
{
fn2 ();
return 0;
}</pre>
</div>
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