<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang crashes on valid code at -O3 running pass 'Aggressive Dead Code Elimination'"
href="https://bugs.llvm.org/show_bug.cgi?id=34258">34258</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O3 running pass 'Aggressive Dead Code Elimination'
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>su@cs.ucdavis.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ clang -v
clang version 6.0.0 (trunk 311306)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
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/4.9.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
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 -O2 small.c; ./a.out
$
$ clang -O3 small.c
clang-6.0:
/tmp/llvm-builder/llvm-source-trunk/include/llvm/Support/GenericDomTreeConstruction.h:1030:
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::DeleteUnreachable(DomTreeT&,
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::BatchUpdatePtr,
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::TreeNodePtr)::<lambda(llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::NodePtr,
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::NodePtr)> [with DomTreeT =
llvm::DominatorTreeBase<llvm::BasicBlock, false>;
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::NodePtr = llvm::BasicBlock*]:
Assertion `TN' failed.
#0 0x00000000022a130a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-6.0+0x22a130a)
#1 0x000000000229f49e llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-6.0+0x229f49e)
#2 0x000000000229f600 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-6.0+0x229f600)
#3 0x00007f1b70198330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007f1b6ef80c37 gsignal
/build/eglibc-SvCtMH/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f1b6ef84028 abort
/build/eglibc-SvCtMH/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f1b6ef79bf6 __assert_fail_base
/build/eglibc-SvCtMH/eglibc-2.19/assert/assert.c:92:0
#7 0x00007f1b6ef79ca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#8 0x0000000001dd2627 unsigned int
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::runDFS<false,
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::DeleteUnreachable(llvm::DominatorTreeBase<llvm::BasicBlock, false>&,
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::BatchUpdateInfo*,
llvm::DomTreeNodeBase<llvm::BasicBlock>*)::{lambda(llvm::BasicBlock*,
llvm::BasicBlock*)#1}>(llvm::BasicBlock*, unsigned int,
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::DeleteUnreachable(llvm::DominatorTreeBase<llvm::BasicBlock, false>&,
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::BatchUpdateInfo*,
llvm::DomTreeNodeBase<llvm::BasicBlock>*)::{lambda(llvm::BasicBlock*,
llvm::BasicBlock*)#1}, unsigned int)
(/usr/local/clang-trunk/bin/clang-6.0+0x1dd2627)
#9 0x0000000001dd43cf
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::DeleteUnreachable(llvm::DominatorTreeBase<llvm::BasicBlock, false>&,
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::BatchUpdateInfo*, llvm::DomTreeNodeBase<llvm::BasicBlock>*)
(/usr/local/clang-trunk/bin/clang-6.0+0x1dd43cf)
#10 0x0000000001dd4faa
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::DeleteEdge(llvm::DominatorTreeBase<llvm::BasicBlock, false>&,
llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::BasicBlock,
false> >::BatchUpdateInfo*, llvm::BasicBlock*, llvm::BasicBlock*) [clone
.constprop.601] (/usr/local/clang-trunk/bin/clang-6.0+0x1dd4faa)
#11 0x000000000208873d (anonymous
namespace)::AggressiveDeadCodeElimination::removeDeadInstructions()
(/usr/local/clang-trunk/bin/clang-6.0+0x208873d)
#12 0x0000000002089efa (anonymous
namespace)::ADCELegacyPass::runOnFunction(llvm::Function&) [clone .part.391]
(/usr/local/clang-trunk/bin/clang-6.0+0x2089efa)
#13 0x0000000001e229c3 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-6.0+0x1e229c3)
#14 0x00000000018c04f6 (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-6.0+0x18c04f6)
#15 0x0000000001e2370a llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-6.0+0x1e2370a)
#16 0x00000000024387a5 (anonymous
namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/usr/local/clang-trunk/bin/clang-6.0+0x24387a5)
#17 0x0000000002439b82 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/usr/local/clang-trunk/bin/clang-6.0+0x2439b82)
#18 0x0000000002b5af6f
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/usr/local/clang-trunk/bin/clang-6.0+0x2b5af6f)
#19 0x0000000002f6fb3c clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-6.0+0x2f6fb3c)
#20 0x0000000002b5a410 clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-6.0+0x2b5a410)
#21 0x00000000027ee37e clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-6.0+0x27ee37e)
#22 0x00000000027c1796
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-6.0+0x27c1796)
#23 0x000000000288a442
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-6.0+0x288a442)
#24 0x0000000000cbaee8 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-6.0+0xcbaee8)
#25 0x0000000000c52e52 main (/usr/local/clang-trunk/bin/clang-6.0+0xc52e52)
#26 0x00007f1b6ef6bf45 __libc_start_main
/build/eglibc-SvCtMH/eglibc-2.19/csu/libc-start.c:321:0
#27 0x0000000000cb68c9 _start (/usr/local/clang-trunk/bin/clang-6.0+0xcb68c9)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-6.0 -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/lib/clang/6.0.0 -internal-isystem /usr/local/include
-internal-isystem /usr/local/clang-trunk/lib/clang/6.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O3
-fdebug-compilation-dir /data2 -ferror-limit 19 -fmessage-length 116
-fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics
-vectorize-loops -vectorize-slp -o /tmp/small-2be141.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 'Aggressive Dead Code Elimination' on function '@fn1'
clang-6.0: error: unable to execute command: Aborted (core dumped)
clang-6.0: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 6.0.0 (trunk 311306)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
clang-6.0: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang-6.0: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-6.0: note: diagnostic msg: /tmp/small-480bef.c
clang-6.0: note: diagnostic msg: /tmp/small-480bef.sh
clang-6.0: note: diagnostic msg:
********************
$
---------------------------------------
int a, b;
void fn1 ()
{
int d, e;
while (b)
{
int f;
b += d++;
if (b)
for (f = 3; f; f--)
{
{
char g = !g || g == -g;
if (a)
continue;
if (d)
break;
}
e++;
}
}
}
int main ()
{
fn1 ();
return 0;
}</pre>
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