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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 at -O1 and above on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=21512">21512</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes at -O1 and above 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 and 3.5.0 crash when compiling the following test case
at -O1 and above in both 32-bit and 64-bit modes on x86_64-linux-gnu.
This is a regression from clang 3.4.x.
$ clang-trunk -v
clang version 3.6.0 (trunk 220839)
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 -O0 -c small.c
$ clang-3.4.2 -O1 -c small.c
$
$ clang-trunk -O1 -c small.c
clang: /tmp/llvm/lib/Transforms/Scalar/SCCP.cpp:120: bool (anonymous
namespace)::LatticeVal::markConstant(llvm::Constant *): Assertion
`getLatticeValue() == forcedconstant && "Cannot move from overdefined to
constant!"' failed.
#0 0x28d6a5a llvm::sys::PrintStackTrace(_IO_FILE*)
(/usr/local/clang-trunk/bin/clang+0x28d6a5a)
#1 0x28d811b (/usr/local/clang-trunk/bin/clang+0x28d811b)
#2 0x7fd202365cb0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0xfcb0)
#3 0x7fd2011840d5 gsignal
/build/buildd/eglibc-2.15/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:64:0
#4 0x7fd20118783b abort /build/buildd/eglibc-2.15/stdlib/abort.c:93:0
#5 0x7fd20117cd9e __assert_fail_base
/build/buildd/eglibc-2.15/assert/assert.c:55:0
#6 0x7fd20117ce42 (/lib/x86_64-linux-gnu/libc.so.6+0x2ee42)
#7 0x240ff8c (/usr/local/clang-trunk/bin/clang+0x240ff8c)
#8 0x240f7e0 (/usr/local/clang-trunk/bin/clang+0x240f7e0)
#9 0x241360a (/usr/local/clang-trunk/bin/clang+0x241360a)
#10 0x240cd9b (/usr/local/clang-trunk/bin/clang+0x240cd9b)
#11 0x240b240 (/usr/local/clang-trunk/bin/clang+0x240b240)
#12 0x2866347 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2866347)
#13 0x8f5a23 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+0x8f5a23)
#14 0x8ea6f5 (/usr/local/clang-trunk/bin/clang+0x8ea6f5)
#15 0xaec5d3 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xaec5d3)
#16 0x6fbd9e clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x6fbd9e)
#17 0x6cf0fc clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x6cf0fc)
#18 0x6b1352 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x6b1352)
#19 0x6a7b27 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x6a7b27)
#20 0x6af9f5 main (/usr/local/clang-trunk/bin/clang+0x6af9f5)
#21 0x7fd20116f76d __libc_start_main
/build/buildd/eglibc-2.15/csu/libc-start.c:258:0
#22 0x6a7799 _start (/usr/local/clang-trunk/bin/clang+0x6a7799)
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 -dwarf-column-info
-coverage-file
/data2/c-hunter-results/C/insert-bugs/REDUCED/20140106-clang-m32-m64-O1-O2-O3-build-0631/small.c
-resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.6.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.6.0/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/insert-bugs/REDUCED/20140106-clang-m32-m64-O1-O2-O3-build-0631
-ferror-limit 19 -fmessage-length 161 -mstackrealign -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 'Interprocedural Sparse Conditional Constant Propagation' on
module 'small.c'.
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 3.6.0 (trunk 220839)
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-a6fb8f.c
clang: note: diagnostic msg: /tmp/small-a6fb8f.sh
clang: note: diagnostic msg:
********************
$
----------------------
long long a;
int b, c;
long long
fn1 ()
{
int d[1];
c = 0;
return d[0] && b;
}
int
fn2 ()
{
a = fn1 ();
return __builtin_parityll (a);
}</pre>
</div>
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