<html>
<head>
<base href="https://llvm.org/bugs/" />
</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 at -O1 and above on x86_64-linux-gnu" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24013&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=KzKI7DtupGFG6ic7n5W9njgj_vsaprnADs_INgN7ubA&s=z79JlfdOJu_G40r0hbJ0_ywsehAomjRrsv6L45JIGtc&e=">24013</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 crashes when compiling the following test case on
x86_64-linux-gnu at -O1 and above in both 32-bit and 64-bit modes.
This is a regression from 3.6.x.
$ clang-trunk -v
clang version 3.7.0 (trunk 241180)
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/5.1.0
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/5.1.0
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 -O0 -c small.c
$ clang-3.6 -O1 -c small.c
$
$ clang-trunk -O1 -c small.c
clang: /tmp/llvm/lib/Transforms/Scalar/LICM.cpp:615: bool
sink(llvm::Instruction &, const llvm::LoopInfo *, const llvm::DominatorTree *,
const llvm::Loop *, llvm::AliasSetTracker *): Assertion
`ExitBlockSet.count(ExitBlock) && "The LCSSA PHI is not in an exit block!"'
failed.
#0 0x2b6e0a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2b6e0a8)
#1 0x2b6f45b (/usr/local/clang-trunk/bin/clang+0x2b6f45b)
#2 0x7f7fe6c81340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#3 0x7f7fe5c1ccc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#4 0x7f7fe5c200d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#5 0x7f7fe5c15b86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#6 0x7f7fe5c15c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#7 0x25665d0 (/usr/local/clang-trunk/bin/clang+0x25665d0)
#8 0x25654db llvm::sinkRegion(llvm::DomTreeNodeBase<llvm::BasicBlock>*,
llvm::AliasAnalysis*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::TargetLibraryInfo*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::LICMSafetyInfo*) (/usr/local/clang-trunk/bin/clang+0x25654db)
#9 0x2564f9a llvm::sinkRegion(llvm::DomTreeNodeBase<llvm::BasicBlock>*,
llvm::AliasAnalysis*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::TargetLibraryInfo*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::LICMSafetyInfo*) (/usr/local/clang-trunk/bin/clang+0x2564f9a)
#10 0x2564f9a llvm::sinkRegion(llvm::DomTreeNodeBase<llvm::BasicBlock>*,
llvm::AliasAnalysis*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::TargetLibraryInfo*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::LICMSafetyInfo*) (/usr/local/clang-trunk/bin/clang+0x2564f9a)
#11 0x2568467 (/usr/local/clang-trunk/bin/clang+0x2568467)
#12 0x285e46e llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x285e46e)
#13 0x2acf334 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2acf334)
#14 0x27a0f98 (/usr/local/clang-trunk/bin/clang+0x27a0f98)
#15 0x2acfa55 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2acfa55)
#16 0x972143 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+0x972143)
#17 0x963ea5 (/usr/local/clang-trunk/bin/clang+0x963ea5)
#18 0xb85743 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xb85743)
#19 0x762af2 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x762af2)
#20 0x73250c clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x73250c)
#21 0x71451c clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x71451c)
#22 0x70b404 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x70b404)
#23 0x712d6e main (/usr/local/clang-trunk/bin/clang+0x712d6e)
#24 0x7f7fe5c07ec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#25 0x70afad _start (/usr/local/clang-trunk/bin/clang+0x70afad)
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
-coverage-file
/home/su/check/tmp/20150625-clang-trunk-m64-g-O3-build-205445/delta/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
/home/su/check/tmp/20150625-clang-trunk-m64-g-O3-build-205445/delta
-ferror-limit 19 -fmessage-length 104 -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 'CallGraph Pass Manager' on module 'small.c'.
4. Running pass 'Loop Pass Manager' on function '@fn1'
5. Running pass 'Loop Invariant Code Motion' on basic block
'%for.cond.outer'
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 241180)
Target: x86_64-unknown-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_bugs_&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=KzKI7DtupGFG6ic7n5W9njgj_vsaprnADs_INgN7ubA&s=IV2nFhB4Q51RnHEEsG0sTF6WfUMt34IyahfbGBzYvjA&e=">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-6b30bd.c
clang: note: diagnostic msg: /tmp/small-6b30bd.sh
clang: note: diagnostic msg:
********************
----------------------------------
int a, b, d, e, f, g, i, j, k;
volatile int c;
static int h;
void
fn1 ()
{
int l = 0, m;
lbl:
if (l)
k = m;
for (;;)
{
int n;
i = m = 0;
if (l)
{
{
int o;
if (d)
break;
}
b = 0;
continue;
}
l = j;
if (h)
goto lbl;
m = c != 0;
if (g)
{
int p;
if (e)
continue;
if (l)
continue;
}
}
for (; f; f++)
for (; a;)
;
}</pre>
</div>
</p>
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