<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 -O3 on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=20093">20093</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -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 -O3 in
both 32-bit and 64-bit modes on x86_64-linux-gnu.
This is a regression from clang 3.4.x.
$ clang-trunk -v
clang version 3.5.0 (trunk 211267)
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 multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -O2 small.c; a.out
$ clang-3.4.2 -O3 small.c; a.out
$
$ clang-trunk -O3 small.c
clang: /tmp/llvm/include/llvm/Support/Casting.h:237: typename cast_retty<X, Y
*>::ret_type llvm::cast(Y *) [X = llvm::Instruction, Y = llvm::Value]:
Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
0 clang 0x00000000026c1cd5 llvm::sys::PrintStackTrace(_IO_FILE*) +
37
1 clang 0x00000000026c24c3
2 libpthread.so.0 0x00007f0c91318cb0
3 libc.so.6 0x00007f0c90136425 gsignal + 53
4 libc.so.6 0x00007f0c90139b8b abort + 379
5 libc.so.6 0x00007f0c9012f0ee
6 libc.so.6 0x00007f0c9012f192
7 clang 0x00000000024be145
llvm::SCEVExpander::replaceCongruentIVs(llvm::Loop*, llvm::DominatorTree
const*, llvm::SmallVectorImpl<llvm::WeakVH>&, llvm::TargetTransformInfo const*)
+ 4597
8 clang 0x00000000022055b2
9 clang 0x000000000244fe8d
llvm::LPPassManager::runOnFunction(llvm::Function&) + 1085
10 clang 0x0000000002653f5b
llvm::FPPassManager::runOnFunction(llvm::Function&) + 539
11 clang 0x00000000023b2645
12 clang 0x0000000002654747
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 967
13 clang 0x00000000008a5bf3
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) +
7203
14 clang 0x00000000008a336a
15 clang 0x0000000000a88043 clang::ParseAST(clang::Sema&, bool, bool)
+ 467
16 clang 0x00000000006d312e clang::FrontendAction::Execute() + 62
17 clang 0x00000000006a99e3
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 851
18 clang 0x000000000068dbde
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 3102
19 clang 0x00000000006848b9 cc1_main(char const**, char const**, char
const*, void*) + 665
20 clang 0x000000000068b8b6 main + 9158
21 libc.so.6 0x00007f0c9012176d __libc_start_main + 237
22 clang 0x0000000000684539
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/3.5.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.5.0/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/REDUCED/20140620-clang-m32-m64-O3-build-test345452
-ferror-limit 19 -fmessage-length 135 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o /tmp/small-c720d5.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 '@main'
5. Running pass 'Induction Variable Simplification' on basic block
'%for.body.i.outer'
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 3.5.0 (trunk 211267)
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-e3a14d.c
clang: note: diagnostic msg: /tmp/small-e3a14d.sh
clang: note: diagnostic msg:
********************
$
-----------------------------
int a, b, **c, f, g, h;
static int ***d = &c;
int
fn1 ()
{
int i;
if (f)
{
int ***j = &c;
lbl:
for (i = 0; i < 2; i++)
{
if (**c)
continue;
b = 0;
for (;;)
if (***d)
break;
for (h = 1; h; h -= i)
**j = 0;
goto lbl;
}
if (***j)
if (a)
g = 0;
}
return 0;
}
int
main ()
{
fn1 ();
return 0;
}</pre>
</div>
</p>
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