https://llvm.org/bugs/show_bug.cgi?id=27838
Bug ID: 27838
Summary: crash at -O2 on x86_64-linxu-gnu in both 32-bit and
64-bit modes (Loops should be in LCSSA form after
loop-unroll.)
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: chengnian...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following code crashes the trunk at -O2 in 32-bit and 64-bit modes on
x86_64-linux-gnu.
$: clang-trunk -v
clang version 3.9.0 (trunk 270354)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
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/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.3
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.7.4
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.2
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$:
$: clang-trunk -O2 -w small.c
clang-3.9:
/tmp/llvm-builder/llvm-source-trunk/lib/Transforms/Utils/LoopUnroll.cpp:676:
bool llvm::UnrollLoop(llvm::Loop*, unsigned int, unsigned int, bool, bool,
unsigned int, llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::DominatorTree*,
llvm::AssumptionCache*, bool): Assertion `OuterL->isLCSSAForm(*DT) && "Loops
should be in LCSSA form after loop-unroll."' failed.
0 clang-3.9 0x0000000001de6ac5
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1 clang-3.9 0x0000000001de4a56 llvm::sys::RunSignalHandlers() + 54
2 clang-3.9 0x0000000001de4c74
3 libpthread.so.0 0x00007faaf3cdc340
4 libc.so.6 0x00007faaf2efacc9 gsignal + 57
5 libc.so.6 0x00007faaf2efe0d8 abort + 328
6 libc.so.6 0x00007faaf2ef3b86
7 libc.so.6 0x00007faaf2ef3c32
8 clang-3.9 0x0000000001e43f98 llvm::UnrollLoop(llvm::Loop*, unsigned
int, unsigned int, bool, bool, unsigned int, llvm::LoopInfo*,
llvm::ScalarEvolution*, llvm::DominatorTree*, llvm::AssumptionCache*, bool) +
11752
9 clang-3.9 0x0000000001ce340e
10 clang-3.9 0x0000000001ce492c
11 clang-3.9 0x00000000026a5b3b
llvm::LPPassManager::runOnFunction(llvm::Function&) + 2011
12 clang-3.9 0x0000000001a51a63
llvm::FPPassManager::runOnFunction(llvm::Function&) + 643
13 clang-3.9 0x00000000026837f7
14 clang-3.9 0x0000000001a521a8
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 872
15 clang-3.9 0x0000000001f34368
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::DataLayout const&, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*) + 4184
16 clang-3.9 0x000000000257487d
17 clang-3.9 0x00000000028d543d clang::ParseAST(clang::Sema&, bool, bool)
+ 845
18 clang-3.9 0x0000000002574bde clang::CodeGenAction::ExecuteAction() +
78
19 clang-3.9 0x000000000225330e clang::FrontendAction::Execute() + 286
20 clang-3.9 0x0000000002228fa6
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 310
21 clang-3.9 0x00000000022e1342
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2370
22 clang-3.9 0x0000000000ad91b8 cc1_main(llvm::ArrayRef<char const*>,
char const*, void*) + 3272
23 clang-3.9 0x0000000000a92d0e main + 6350
24 libc.so.6 0x00007faaf2ee5ec5 __libc_start_main + 245
25 clang-3.9 0x0000000000ad5224
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-3.9 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c
-mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-momit-leaf-frame-pointer -dwarf-column-info -debugger-tuning=gdb -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.9.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.9.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O2 -w -fdebug-compilation-dir
/data2/c-hunter-results/C/instrument-bugs/REDUCED/20160522-clang-trunk-m64-g-O3-build-171343/delta
-ferror-limit 19 -fmessage-length 220 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o /tmp/small-aba209.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 'Unroll loops' on basic block '%for.cond5.preheader'
clang-3.9: error: unable to execute command: Aborted (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 270354)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-3.9: 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-3.9: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/small-2588f1.c
clang-3.9: note: diagnostic msg: /tmp/small-2588f1.sh
clang-3.9: note: diagnostic msg:
********************
$:
$: cat small.c
int *a;
char b = 3;
void fn1() {
char c;
for (; c - 2; c = c - 6) {
b--;
c = 6;
for (; c >= 0; c--)
for (; a; *a = 1)
;
if (a)
break;
}
}
int main() {}
$:
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