https://llvm.org/bugs/show_bug.cgi?id=26524
Bug ID: 26524
Summary: clang crashes on valid code at -O2 and -O3 on
x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The current clang trunk crashes when compiling the following test case on
x86_64-linux-gnu at -O2 and -O3 in both 32-bit and 64-bit modes.
This is a regression from 3.7.x.
$ clang-trunk -v
clang version 3.9.0 (trunk 260022)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/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/4.8.4
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
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 -Os -c small.c
$ clang-3.7 -O2 -c small.c
$
$ clang-trunk -O2 -c small.c
clang-3.9: /tmp/llvm/lib/Transforms/Utils/LoopUnroll.cpp:604: 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 0x0000000002c9accd llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c9accd)
#1 0x0000000002c9afe2 PrintStackTraceSignalHandler(void*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c9afe2)
#2 0x0000000002c9962f llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-3.9+0x2c9962f)
#3 0x0000000002c9a743 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c9a743)
#4 0x00007f0ac43a9340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#5 0x00007f0ac35c7cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#6 0x00007f0ac35cb0d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#7 0x00007f0ac35c0b86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#8 0x00007f0ac35c0c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#9 0x0000000002cf0b97 llvm::UnrollLoop(llvm::Loop*, unsigned int, unsigned int,
bool, bool, unsigned int, llvm::LoopInfo*, llvm::ScalarEvolution*,
llvm::DominatorTree*, llvm::AssumptionCache*, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x2cf0b97)
#10 0x0000000002b4f92f tryToUnrollLoop(llvm::Loop*, llvm::DominatorTree&,
llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::TargetTransformInfo const&,
llvm::AssumptionCache&, bool, llvm::Optional<unsigned int>,
llvm::Optional<unsigned int>, llvm::Optional<bool>, llvm::Optional<bool>)
(/usr/local/clang-trunk/bin/clang-3.9+0x2b4f92f)
#11 0x0000000002b4fbf5 (anonymous
namespace)::LoopUnroll::runOnLoop(llvm::Loop*, llvm::LPPassManager&)
(/usr/local/clang-trunk/bin/clang-3.9+0x2b4fbf5)
#12 0x000000000382eed1 llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-3.9+0x382eed1)
#13 0x00000000027ebf58 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-3.9+0x27ebf58)
#14 0x000000000380a819 (anonymous
namespace)::CGPassManager::RunPassOnSCC(llvm::Pass*, llvm::CallGraphSCC&,
llvm::CallGraph&, bool&, bool&)
(/usr/local/clang-trunk/bin/clang-3.9+0x380a819)
#15 0x000000000380b915 (anonymous
namespace)::CGPassManager::RunAllPassesOnSCC(llvm::CallGraphSCC&,
llvm::CallGraph&, bool&) (/usr/local/clang-trunk/bin/clang-3.9+0x380b915)
#16 0x000000000380bc38 (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-3.9+0x380bc38)
#17 0x00000000027ec486 (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-3.9+0x27ec486)
#18 0x00000000027ecbf0 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-3.9+0x27ecbf0)
#19 0x00000000027ece31 llvm::legacy::PassManager::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-3.9+0x27ece31)
#20 0x0000000002e89374 (anonymous
namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction,
llvm::raw_pwrite_stream*) (/usr/local/clang-trunk/bin/clang-3.9+0x2e89374)
#21 0x0000000002e894bb clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::StringRef, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*) (/usr/local/clang-trunk/bin/clang-3.9+0x2e894bb)
#22 0x00000000036bfe4f
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/usr/local/clang-trunk/bin/clang-3.9+0x36bfe4f)
#23 0x0000000003ef2148 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x3ef2148)
#24 0x000000000332976a clang::ASTFrontendAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-3.9+0x332976a)
#25 0x00000000036c2cb8 clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-3.9+0x36c2cb8)
#26 0x000000000332922f clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-3.9+0x332922f)
#27 0x00000000032e40f8
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-3.9+0x32e40f8)
#28 0x000000000341cca6
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-3.9+0x341cca6)
#29 0x000000000157e726 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-3.9+0x157e726)
#30 0x00000000015758c3 ExecuteCC1Tool(llvm::ArrayRef<char const*>,
llvm::StringRef) (/usr/local/clang-trunk/bin/clang-3.9+0x15758c3)
#31 0x0000000001576391 main (/usr/local/clang-trunk/bin/clang-3.9+0x1576391)
#32 0x00007f0ac35b2ec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#33 0x0000000001571cf9 _start (/usr/local/clang-trunk/bin/clang-3.9+0x1571cf9)
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
-coverage-file /data2/small.c -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 -fdebug-compilation-dir /data2
-ferror-limit 19 -fmessage-length 144 -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 'Unroll loops' on basic block '%while.cond'
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 260022)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/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-63a9dd.c
clang-3.9: note: diagnostic msg: /tmp/small-63a9dd.sh
clang-3.9: note: diagnostic msg:
********************
$
------------------------------
short a;
int b, *c = &b, d;
int
fn1 ()
{
int j = 0;
for (; d;)
for (; j < 1; j++)
while (b)
{
*c = 4;
for (; *c;)
return a;
}
return 0;
}
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