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<head>
<base href="http://llvm.org/bugs/" />
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<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 -O1 and above with -g enabled on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=22294">22294</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O1 and above with -g enabled on x86_64-linux-gnu
</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>normal
</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>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The current clang trunk crashes when compiling the following test case at -O1
and above with -g enabled in both 32-bit and 64-bit modes on x86_64-linux-gnu.
This is a regression from clang 3.5.x.
$ clang-trunk -v
clang version 3.7.0 (trunk 226698)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
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/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -O1 -c small.c
$ clang-3.5.0 -O1 -g -c small.c
$
$ clang-trunk -O1 -g -c small.c
clang: /tmp/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp:1676: void
llvm::DwarfDebug::emitLocPieces(llvm::ByteStreamer&, const
DITypeIdentifierMap&, llvm::ArrayRef<llvm::DebugLocEntry::Value>): Assertion
`Offset <= PieceOffset && "overlapping or duplicate pieces"' failed.
#0 0x2a5cd42 llvm::sys::PrintStackTrace(_IO_FILE*)
(/usr/local/clang-trunk/bin/clang+0x2a5cd42)
#1 0x2a5acdb (/usr/local/clang-trunk/bin/clang+0x2a5acdb)
#2 0x7f0954822cb0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0xfcb0)
#3 0x7f09538490d5 gsignal
/build/buildd/eglibc-2.15/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:64:0
#4 0x7f095384c83b abort /build/buildd/eglibc-2.15/stdlib/abort.c:93:0
#5 0x7f0953841d9e __assert_fail_base
/build/buildd/eglibc-2.15/assert/assert.c:55:0
#6 0x7f0953841e42 (/lib/x86_64-linux-gnu/libc.so.6+0x2ee42)
#7 0x22195d0 llvm::DwarfDebug::emitLocPieces(llvm::ByteStreamer&,
llvm::DenseMap<llvm::MDString const*, llvm::MDNode*,
llvm::DenseMapInfo<llvm::MDString const*>,
llvm::detail::DenseMapPair<llvm::MDString const*, llvm::MDNode*> > const&,
llvm::ArrayRef<llvm::DebugLocEntry::Value>)
(/usr/local/clang-trunk/bin/clang+0x22195d0)
#8 0x2219746 llvm::DwarfDebug::emitDebugLocEntry(llvm::ByteStreamer&,
llvm::DebugLocEntry const&) (/usr/local/clang-trunk/bin/clang+0x2219746)
#9 0x2219867 llvm::DwarfDebug::emitDebugLocEntryLocation(llvm::DebugLocEntry
const&) (/usr/local/clang-trunk/bin/clang+0x2219867)
#10 0x2219ab2 llvm::DwarfDebug::emitDebugLoc()
(/usr/local/clang-trunk/bin/clang+0x2219ab2)
#11 0x222a279 llvm::DwarfDebug::endModule()
(/usr/local/clang-trunk/bin/clang+0x222a279)
#12 0x220b910 llvm::AsmPrinter::doFinalization(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x220b910)
#13 0x29d47ab llvm::FPPassManager::doFinalization(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x29d47ab)
#14 0x29df24f llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x29df24f)
#15 0x953055 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::StringRef, llvm::Module*, clang::BackendAction,
llvm::raw_ostream*) (/usr/local/clang-trunk/bin/clang+0x953055)
#16 0x944294 (/usr/local/clang-trunk/bin/clang+0x944294)
#17 0xb3558a clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xb3558a)
#18 0x9465a1 clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang+0x9465a1)
#19 0x760b16 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x760b16)
#20 0x73e59e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x73e59e)
#21 0x7207bc clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x7207bc)
#22 0x7171c8 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x7171c8)
#23 0x71fac1 main (/usr/local/clang-trunk/bin/clang+0x71fac1)
#24 0x7f095383476d __libc_start_main
/build/buildd/eglibc-2.15/csu/libc-start.c:258:0
#25 0x715f99 _start (/usr/local/clang-trunk/bin/clang+0x715f99)
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 2.22 -momit-leaf-frame-pointer -g -dwarf-column-info
-coverage-file
/data2/c-hunter-results/C/trans-bugs/REDUCED/20150121-clang-m32-m64-O1-O2-O3-Os-build-test18822/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 -O1 -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/REDUCED/20150121-clang-m32-m64-O1-O2-O3-Os-build-test18822
-ferror-limit 19 -fmessage-length 107 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -o small.o -x c small.c
1. <eof> parser at end of file
2. Code generation
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 226698)
Target: x86_64-unknown-linux-gnu
Thread model: posix
clang: 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: 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-8127fe.c
clang: note: diagnostic msg: /tmp/small-8127fe.sh
clang: note: diagnostic msg:
********************
$
----------------------
struct S
{
char f1;
int f2;
} a;
int e;
char f;
void
fn1 ()
{
struct S b, c, d = { 0, 0 };
e = d.f2;
a = c = b = d;
f = c.f1;
}</pre>
</div>
</p>
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