[LLVMbugs] [Bug 19884] New: clang crashes on valid code at -O3 on x86_64-linux-gnu
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Wed May 28 20:30:15 PDT 2014
http://llvm.org/bugs/show_bug.cgi?id=19884
Bug ID: 19884
Summary: clang crashes on valid code at -O3 on x86_64-linux-gnu
Product: clang
Version: unspecified
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 -O3 on
x86_64-linux-gnu in both 32-bit and 64-bit modes.
This is a regression from clang 3.4.
Possibly related to 18861 (but 18861 also fails at -O2).
$ clang-trunk -v
clang version 3.5.0 (trunk 209730)
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 -c small.c
$ clang-3.4 -O3 -c small.c
$
$ clang-trunk -O3 -c small.c
clang: /tmp/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:1898: 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 0x00000000026b3452 llvm::sys::PrintStackTrace(_IO_FILE*) +
34
1 clang 0x00000000026b3039
2 libpthread.so.0 0x00007fbf3f797cb0
3 libc.so.6 0x00007fbf3e7bd425 gsignal + 53
4 libc.so.6 0x00007fbf3e7c0b8b abort + 379
5 libc.so.6 0x00007fbf3e7b60ee
6 libc.so.6 0x00007fbf3e7b6192
7 clang 0x00000000021dd862
8 clang 0x000000000241a647
llvm::LPPassManager::runOnFunction(llvm::Function&) + 1735
9 clang 0x000000000264287f
llvm::FPPassManager::runOnFunction(llvm::Function&) + 639
10 clang 0x000000000237db14
11 clang 0x0000000002643f0f
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 863
12 clang 0x00000000008d68e8
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) +
3080
13 clang 0x00000000008d0bbf
14 clang 0x0000000000a9243a clang::ParseAST(clang::Sema&, bool, bool)
+ 490
15 clang 0x00000000008d3061 clang::CodeGenAction::ExecuteAction() +
97
16 clang 0x0000000000713966 clang::FrontendAction::Execute() + 182
17 clang 0x00000000006f3c7d
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 349
18 clang 0x00000000006d6c4c
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1564
19 clang 0x00000000006ce2a8 cc1_main(char const**, char const**, char
const*, void*) + 1240
20 clang 0x00000000006d4bad main + 797
21 libc.so.6 0x00007fbf3e7a876d __libc_start_main + 237
22 clang 0x00000000006ccf79
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 -coverage-file
/data2/c-hunter-results/C/trans-bugs/REDUCED/20140527-clang-m32-m64-O3-build-test25871/small.o
-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/20140527-clang-m32-m64-O3-build-test25871
-ferror-limit 19 -fmessage-length 180 -mstackrealign -fobjc-runtime=gcc
-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 'Loop Pass Manager' on function '@fn1'
5. Running pass 'Induction Variable Simplification' 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 3.5.0 (trunk 209730)
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-b0ad75.c
clang: note: diagnostic msg: /tmp/small-b0ad75.sh
clang: note: diagnostic msg:
********************
$
-----------------------------
int a, b, c, d, f, g, h, i;
void
fn1 ()
{
int k[1] = { 0 };
l1:
for (; b; b++)
;
l2:
for (f = 0; f < 1; f++)
for (; g;)
i = k[0];
if (i)
goto l1;
for (; c; c++)
{
if (a)
goto l2;
if (h)
k[0] = b || d;
}
}
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