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<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 on valid code at -O2 on x86_64-linux-gnu while running pass 'Induction Variable Simplification': Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "LCSSA required to run indvars!"' failed"
href="https://llvm.org/bugs/show_bug.cgi?id=31718">31718</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O2 on x86_64-linux-gnu while running pass 'Induction Variable Simplification': Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "LCSSA required to run indvars!"' failed
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ clang -v
clang version 5.0.0 (trunk 292714)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
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/4.7.4
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/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang -Os small.c
$
$ clang -O2 small.c
clang-5.0:
/tmp/llvm-builder/llvm-source-trunk/lib/Transforms/Scalar/IndVarSimplify.cpp:2369:
bool {anonymous}::IndVarSimplify::run(llvm::Loop*): Assertion
`L->isRecursivelyLCSSAForm(*DT, *LI) && "LCSSA required to run indvars!"'
failed.
#0 0x0000000001e1a2d8 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-5.0+0x1e1a2d8)
#1 0x0000000001e17f6e llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-5.0+0x1e17f6e)
#2 0x0000000001e180e2 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-5.0+0x1e180e2)
#3 0x00007f45a22a5390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#4 0x00007f45a1018428 gsignal
/build/glibc-t3gR2i/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
#5 0x00007f45a101a02a abort /build/glibc-t3gR2i/glibc-2.23/stdlib/abort.c:91:0
#6 0x00007f45a1010bd7 __assert_fail_base
/build/glibc-t3gR2i/glibc-2.23/assert/assert.c:92:0
#7 0x00007f45a1010c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
#8 0x0000000001c8447b (anonymous
namespace)::IndVarSimplifyLegacyPass::runOnLoop(llvm::Loop*,
llvm::LPPassManager&) [clone .part.440] [clone .constprop.452]
(/usr/local/clang-trunk/bin/clang-5.0+0x1c8447b)
#9 0x000000000281930b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-5.0+0x281930b)
#10 0x00000000019f3173 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-5.0+0x19f3173)
#11 0x00000000027dbbcf (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-5.0+0x27dbbcf)
#12 0x00000000019f2cdd llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-5.0+0x19f2cdd)
#13 0x0000000001fbc8c2 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-5.0+0x1fbc8c2)
#14 0x0000000002625d00
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/usr/local/clang-trunk/bin/clang-5.0+0x2625d00)
#15 0x0000000002a0d4d8 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-5.0+0x2a0d4d8)
#16 0x0000000002620739 clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-5.0+0x2620739)
#17 0x0000000002317f16 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-5.0+0x2317f16)
#18 0x00000000022ea856
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-5.0+0x22ea856)
#19 0x000000000239f63a
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-5.0+0x239f63a)
#20 0x0000000000a49ac8 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-5.0+0xa49ac8)
#21 0x00000000009dbd9c main (/usr/local/clang-trunk/bin/clang-5.0+0x9dbd9c)
#22 0x00007f45a1003830 __libc_start_main
/build/glibc-t3gR2i/glibc-2.23/csu/../csu/libc-start.c:325:0
#23 0x0000000000a46169 _start (/usr/local/clang-trunk/bin/clang-5.0+0xa46169)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-5.0 -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/bin/../lib/clang/5.0.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/5.0.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir
/home/su/specres/good/20170121-clang-trunk-m32-O1-build-181226 -ferror-limit 19
-fmessage-length 259 -fobjc-runtime=gcc -fdiagnostics-show-option
-fcolor-diagnostics -vectorize-loops -vectorize-slp -o /tmp/small-5d19a2.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 '@main'
5. Running pass 'Induction Variable Simplification' on basic block
'%while.cond'
clang-5.0: error: unable to execute command: Aborted (core dumped)
clang-5.0: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 5.0.0 (trunk 292714)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
clang-5.0: 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-5.0: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-5.0: note: diagnostic msg: /tmp/small-db0361.c
clang-5.0: note: diagnostic msg: /tmp/small-db0361.sh
clang-5.0: note: diagnostic msg:
********************
$
-----------------------------------------
int a, b, c;
int main ()
{
int d;
if (a)
while (1)
{
while (a)
for (c = 0; c < 2; c++)
while (a)
{
if (b)
return d;
b = 0;
}
d = b;
}
return 0;
}</pre>
</div>
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