[llvm-bugs] [Bug 51275] New: clang crashes on valid code at -Os and above: Assertion `!empty()' failed

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Jul 29 14:26:46 PDT 2021 

https://bugs.llvm.org/show_bug.cgi?id=51275

            Bug ID: 51275
           Summary: clang crashes on valid code at -Os and above:
                    Assertion `!empty()' failed
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: zhendong.su at inf.ethz.ch
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

It appears to be a recent regression.

[633] % clangtk -v
clang version 14.0.0 (https://github.com/llvm/llvm-project.git
26be7fe27c66a4db21ca2290ade10b171513177f)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/suz-local/opfuzz/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
[634] % 
[634] % clangtk -O1 small.c
[635] % 
[635] % clangtk -Os small.c
clang-14:
/local/suz-local/software/clangbuild/llvm-project/llvm/include/llvm/ADT/ArrayRef.h:169:
const T& llvm::ArrayRef<T>::front() const [with T = llvm::Value*]: Assertion
`!empty()' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments:
/local/suz-local/software/local/clang-trunk/bin/clang-14 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj --mrelax-relocations -disable-free
-main-file-name small.c -mrelocation-model static -mframe-pointer=none
-fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases
-munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb
-fcoverage-compilation-dir=/home/suz -resource-dir
/local/suz-local/software/local/clang-trunk/lib/clang/14.0.0 -I
/usr/local/include/csmith -I /local/suz-local/software/local/include
-internal-isystem
/local/suz-local/software/local/clang-trunk/lib/clang/14.0.0/include
-internal-isystem /usr/local/include -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../x86_64-linux-gnu/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include -Os
-fdebug-compilation-dir=/home/suz -ferror-limit 19 -fgnuc-version=4.2.1
-fcolor-diagnostics -vectorize-loops -vectorize-slp -faddrsig
-D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/small-374d0a.o -x c small.c
1.      <eof> parser at end of file
2.      Optimizer
 #0 0x0000558218505c4f PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #1 0x00005582185033fd SignalHandler(int) Signals.cpp:0:0
 #2 0x00007ff0f83bb8a0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x128a0)
 #3 0x00007ff0f706cf47 raise
/build/glibc-2ORdQG/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #4 0x00007ff0f706e8b1 abort /build/glibc-2ORdQG/glibc-2.27/stdlib/abort.c:81:0
 #5 0x00007ff0f705e42a __assert_fail_base
/build/glibc-2ORdQG/glibc-2.27/assert/assert.c:89:0
 #6 0x00007ff0f705e4a2 (/lib/x86_64-linux-gnu/libc.so.6+0x304a2)
 #7 0x0000558218740306
llvm::slpvectorizer::BoUpSLP::getEntryCost(llvm::slpvectorizer::BoUpSLP::TreeEntry
const*, llvm::ArrayRef<llvm::Value*>)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3c03306)
 #8 0x000055821875b1e2
llvm::slpvectorizer::BoUpSLP::getTreeCost(llvm::ArrayRef<llvm::Value*>)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3c1e1e2)
 #9 0x000055821875d111
llvm::SLPVectorizerPass::tryToVectorizeList(llvm::ArrayRef<llvm::Value*>,
llvm::slpvectorizer::BoUpSLP&, bool)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3c20111)
#10 0x0000558218762b30
llvm::SLPVectorizerPass::vectorizeChainsInBlock(llvm::BasicBlock*,
llvm::slpvectorizer::BoUpSLP&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3c25b30)
#11 0x00005582187659bc llvm::SLPVectorizerPass::runImpl(llvm::Function&,
llvm::ScalarEvolution*, llvm::TargetTransformInfo*, llvm::TargetLibraryInfo*,
llvm::AAResults*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::AssumptionCache*, llvm::DemandedBits*, llvm::OptimizationRemarkEmitter*)
(.part.2032) SLPVectorizer.cpp:0:0
#12 0x00005582187669cb llvm::SLPVectorizerPass::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3c299cb)
#13 0x00005582196c4b41 llvm::detail::PassModel<llvm::Function,
llvm::SLPVectorizerPass, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::Function> >::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x4b87b41)
#14 0x0000558217cd2f2c llvm::PassManager<llvm::Function,
llvm::AnalysisManager<llvm::Function> >::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3195f2c)
#15 0x00005582162a8cf1 llvm::detail::PassModel<llvm::Function,
llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function> >,
llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Function>
>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x176bcf1)
#16 0x0000558217cd2814 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3195814)
#17 0x00005582162a96f1 llvm::detail::PassModel<llvm::Module,
llvm::ModuleToFunctionPassAdaptor, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x176c6f1)
#18 0x0000558217cd0fd4 llvm::PassManager<llvm::Module,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3193fd4)
#19 0x00005582188074b4 (anonymous
namespace)::EmitAssemblyHelper::EmitAssemblyWithNewPassManager(clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >) BackendUtil.cpp:0:0
#20 0x000055821880c3f3 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef,
llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x3ccf3f3)
#21 0x00005582194f6d4a
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x49b9d4a)
#22 0x000055821a3cf659 clang::ParseAST(clang::Sema&, bool, bool)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x5892659)
#23 0x00005582194f6ee8 clang::CodeGenAction::ExecuteAction()
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x49b9ee8)
#24 0x0000558218e440f1 clang::FrontendAction::Execute()
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x43070f1)
#25 0x0000558218de03ca
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x42a33ca)
#26 0x0000558218f1374a
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x43d674a)
#27 0x000055821601768c cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/local/suz-local/software/local/clang-trunk/bin/clang-14+0x14da68c)
#28 0x0000558216012a39 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
driver.cpp:0:0
#29 0x0000558215f406b6 main
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x14036b6)
#30 0x00007ff0f704fb97 __libc_start_main
/build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:344:0
#31 0x00005582160125aa _start
(/local/suz-local/software/local/clang-trunk/bin/clang-14+0x14d55aa)
clang-14: error: unable to execute command: Aborted
clang-14: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 14.0.0 (https://github.com/llvm/llvm-project.git
26be7fe27c66a4db21ca2290ade10b171513177f)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/suz-local/opfuzz/bin
clang-14: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-14: note: diagnostic msg: /tmp/small-e70097.c
clang-14: note: diagnostic msg: /tmp/small-e70097.sh
clang-14: note: diagnostic msg: 

********************
[636] % 
[636] % cat small.c
int printf (const char *, ...);
int a, b;
#pragma pack(1)
struct {
  int c : 4;
  volatile int d : 9;
  int : 7;
  int e : 23;
  int f : 25;
} g, h, i, j;
volatile int k;
int main() {
  while (b) {
    g.d;
    int l = h.f ^ i.e ^ j.c;
    if (a)
      printf("%d", a);
    j.f = l;
    g.f && k;
  }
  return 0;
}

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