[llvm-bugs] [Bug 25628] New: clang crashes on valid code at -O1 and above on x86_64-linux-gnu
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue Nov 24 11:59:25 PST 2015
https://llvm.org/bugs/show_bug.cgi?id=25628
Bug ID: 25628
Summary: clang crashes on valid code at -O1 and above 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: llvm-bugs at lists.llvm.org
Classification: Unclassified
The current clang trunk crashes when compiling the following test case on
x86_64-linux-gnu at -O1 and above in both 32-bit and 64-bit modes.
It also affects all earlier clang versions including 3.2 and later, thus a
regression from 3.1.
$ clang-trunk -v
clang version 3.8.0 (trunk 253909)
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/4.9.2
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.1.0
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/4.9.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.1.0
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 -O0 -c small.c
$ clang-3.1 -O1 -c small.c
$
$ clang-trunk -O1 -c small.c
clang: /tmp/llvm/lib/Transforms/Scalar/LICM.cpp:896: bool
llvm::promoteLoopAccessesToScalars(llvm::AliasSet&,
llvm::SmallVectorImpl<llvm::BasicBlock*>&,
llvm::SmallVectorImpl<llvm::Instruction*>&, llvm::PredIteratorCache&,
llvm::LoopInfo*, llvm::DominatorTree*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::LICMSafetyInfo*): Assertion `!load->isVolatile() && "AST broken"' failed.
#0 0x0000000003144075 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x3144075)
#1 0x0000000003141ae6 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang+0x3141ae6)
#2 0x0000000003141cf6 (/usr/local/clang-trunk/bin/clang+0x3141cf6)
#3 0x00007f2a52308340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x00007f2a512a3cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f2a512a70d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f2a5129cb86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#7 0x00007f2a5129cc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x0000000002aae4ec llvm::promoteLoopAccessesToScalars(llvm::AliasSet&,
llvm::SmallVectorImpl<llvm::BasicBlock*>&,
llvm::SmallVectorImpl<llvm::Instruction*>&, llvm::PredIteratorCache&,
llvm::LoopInfo*, llvm::DominatorTree*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::LICMSafetyInfo*) (/usr/local/clang-trunk/bin/clang+0x2aae4ec)
#9 0x0000000002ab2deb (/usr/local/clang-trunk/bin/clang+0x2ab2deb)
#10 0x0000000002dd450f llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2dd450f)
#11 0x00000000030b018f llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x30b018f)
#12 0x0000000002d46cca (/usr/local/clang-trunk/bin/clang+0x2d46cca)
#13 0x00000000030b1d97 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x30b1d97)
#14 0x0000000000bbf762 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+0xbbf762)
#15 0x0000000000b9beb8 (/usr/local/clang-trunk/bin/clang+0xb9beb8)
#16 0x0000000000e032e2 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xe032e2)
#17 0x0000000000b9e9d2 clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang+0xb9e9d2)
#18 0x0000000000984486 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x984486)
#19 0x00000000009596ee
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x9596ee)
#20 0x000000000093a92c
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x93a92c)
#21 0x0000000000932740 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang+0x932740)
#22 0x0000000000918968 main (/usr/local/clang-trunk/bin/clang+0x918968)
#23 0x00007f2a5128eec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#24 0x0000000000930dcd _start (/usr/local/clang-trunk/bin/clang+0x930dcd)
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 -mthread-model posix -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-target-linker-version 2.24 -momit-leaf-frame-pointer -dwarf-column-info
-coverage-file /data2/small.c -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.8.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.8.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir /data2
-ferror-limit 19 -fmessage-length 164 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -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 'Loop Invariant Code Motion' on basic block '%for.body'
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 3.8.0 (trunk 253909)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
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-f12c64.c
clang: note: diagnostic msg: /tmp/small-f12c64.sh
clang: note: diagnostic msg:
********************
$
-------------------------------------------
short a;
volatile int *b;
static volatile int **c = &b, **d = &b;
int *e, g;
void
fn1 ()
{
for (; g;)
{
*c = 0;
a = 0;
for (; a < 1; a++)
{
int **f = &e;
*e = 0;
*f = 0;
}
*e = 1;
**d;
}
}
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