[LLVMbugs] [Bug 18042] New: clang crashes on valid code at -Os and -O2 on x86_64-linux-gnu
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Sat Nov 23 08:38:27 PST 2013
http://llvm.org/bugs/show_bug.cgi?id=18042
Bug ID: 18042
Summary: clang crashes on valid code at -Os and -O2 on
x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangbugs at nondot.org
Reporter: su at cs.ucdavis.edu
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
The current clang trunk crashes when compiling the following testcase at -Os
and -O2 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
This is a regression from clang 3.3.
$ clang-trunk -v
clang version 3.5 (trunk 195545)
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 -O1 small.c; a.out
$ clang-3.3 -Os small.c; a.out
$
$ gcc-trunk -Os small.c; a.out
$ icc -Os small.c; a.out
$
$ clang-trunk -Os small.c; a.out
clang: /tmp/llvm/lib/Transforms/Utils/LCSSA.cpp:159: virtual bool <anonymous
namespace>::LCSSA::runOnLoop(llvm::Loop *, llvm::LPPassManager &): Assertion
`L->isLCSSAForm(*DT)' failed.
0 clang 0x00000000021c1215 llvm::sys::PrintStackTrace(_IO_FILE*) +
37
1 clang 0x00000000021c1653
2 libpthread.so.0 0x00007f83d0ab4cb0
3 libc.so.6 0x00007f83cf8d6425 gsignal + 53
4 libc.so.6 0x00007f83cf8d9b8b abort + 379
5 libc.so.6 0x00007f83cf8cf0ee
6 libc.so.6 0x00007f83cf8cf192
7 clang 0x0000000001ed4716
8 clang 0x0000000001fa29a0
llvm::LPPassManager::runOnFunction(llvm::Function&) + 944
9 clang 0x000000000215656a
llvm::FPPassManager::runOnFunction(llvm::Function&) + 362
10 clang 0x0000000001f1f4aa
11 clang 0x0000000002156d97
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 999
12 clang 0x000000000084eb03
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 5955
13 clang 0x000000000084c7c6
14 clang 0x00000000009bd6e3 clang::ParseAST(clang::Sema&, bool, bool)
+ 515
15 clang 0x000000000084ba42 clang::CodeGenAction::ExecuteAction() +
514
16 clang 0x00000000006c1740 clang::FrontendAction::Execute() + 112
17 clang 0x000000000069eaad
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 925
18 clang 0x0000000000685fc0
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2880
19 clang 0x000000000067e23f cc1_main(char const**, char const**, char
const*, void*) + 687
20 clang 0x0000000000684220 main + 9184
21 libc.so.6 0x00007f83cf8c176d __libc_start_main + 237
22 clang 0x000000000067dec9
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 -Os -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/20131123-clang-m32-m64-O2-Os-build-test258680
-ferror-limit 19 -fmessage-length 103 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o /tmp/small-c06d46.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 '@bar'
5. Running pass 'Loop-Closed SSA Form Pass' on basic block
'%for.condthread-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 195545)
Target: x86_64-unknown-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ 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-87fe25.c
clang: note: diagnostic msg: /tmp/small-87fe25.sh
clang: note: diagnostic msg:
********************
$
------------------------------------------------
int a, b, c, d, e, f, g, h;
int
foo (int p)
{
return p;
}
void
bar ()
{
int *i = &h, *j = 0;
l1:
for (; d;)
;
l2:
e = 0;
if (foo (1))
a = 0;
for (; a >= 0; a--)
{
for (f = 1; f; f--)
{
*i = 0;
j = &d;
}
for (g = 0; g < 1; g++)
{
*i ^= 1;
*j = 0;
if (b)
goto l2;
}
if (c)
goto l1;
}
}
int
main ()
{
bar ();
return 0;
}
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