[LLVMbugs] [Bug 23353] New: clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Sun Apr 26 10:06:36 PDT 2015
https://llvm.org/bugs/show_bug.cgi?id=23353
Bug ID: 23353
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: 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 test case on
x86_64-linux-gnu at -O2 and -O3 in both 32-bit and 64-bit modes.
It also affects 3.5.0 and 3.6.0, but not 3.4.x.
$ clang-trunk -v
clang version 3.7.0 (trunk 235803)
Target: x86_64-unknown-linux-gnu
Thread model: posix
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/5.0.0
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/4.8.2
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/5.0.0
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-3.4.2 -O2 -c small.c
$
$ clang-trunk -O2 -c small.c
clang: /tmp/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:6324: unsigned int
llvm::SelectionDAG::AssignTopologicalOrder(): Assertion
`AllNodes.back().use_empty() && "Last node in topologic sort has users!"'
failed.
#0 0x2af9faa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2af9faa)
#1 0x2afb43b (/usr/local/clang-trunk/bin/clang+0x2afb43b)
#2 0x7fd88429d340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#3 0x7fd88323bcc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#4 0x7fd88323f0d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#5 0x7fd883234b86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#6 0x7fd883234c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#7 0x21909c1 llvm::SelectionDAG::AssignTopologicalOrder()
(/usr/local/clang-trunk/bin/clang+0x21909c1)
#8 0x21e51de llvm::SelectionDAGISel::DoInstructionSelection()
(/usr/local/clang-trunk/bin/clang+0x21e51de)
#9 0x21e4418 llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/usr/local/clang-trunk/bin/clang+0x21e4418)
#10 0x21e2d98 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function
const&) (/usr/local/clang-trunk/bin/clang+0x21e2d98)
#11 0x21df864
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/usr/local/clang-trunk/bin/clang+0x21df864)
#12 0x1fef321 (/usr/local/clang-trunk/bin/clang+0x1fef321)
#13 0x237e76c llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x237e76c)
#14 0x2a59e24 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2a59e24)
#15 0x2a5a05b llvm::FPPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2a5a05b)
#16 0x2a5a545 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2a5a545)
#17 0x95a69d 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+0x95a69d)
#18 0x94c5e5 (/usr/local/clang-trunk/bin/clang+0x94c5e5)
#19 0xb67403 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xb67403)
#20 0x740ebe clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x740ebe)
#21 0x712b0c clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x712b0c)
#22 0x6f4dc8 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x6f4dc8)
#23 0x6ebfa2 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x6ebfa2)
#24 0x6f3550 main (/usr/local/clang-trunk/bin/clang+0x6f3550)
#25 0x7fd883226ec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#26 0x6ebc19 _start (/usr/local/clang-trunk/bin/clang+0x6ebc19)
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
-fno-unique-section-names -coverage-file
/data2/c-hunter-results/C/instrument-bugs/CSMITH/20150424-clang-trunk-m64-g-O3-build-064506/small.c
-resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.7.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.7.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir
/data2/c-hunter-results/C/instrument-bugs/CSMITH/20150424-clang-trunk-m64-g-O3-build-064506
-ferror-limit 19 -fmessage-length 140 -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. Code generation
3. Running pass 'Function Pass Manager' on module 'small.c'.
4. Running pass 'X86 DAG->DAG Instruction Selection' on function '@fn2'
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 3.7.0 (trunk 235803)
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-a82618.c
clang: note: diagnostic msg: /tmp/small-a82618.sh
clang: note: diagnostic msg:
********************
$
-----------------------------
int a;
volatile int b;
char c;
char
fn1 (char p1, char p2)
{
return p1 * p2;
}
void
fn2 ()
{
for (c = -2; c < 3; c++)
b = fn1 (c, a) && 1;
}
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