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<head>
<base href="https://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 on x86_64-linux-gnu"
href="https://llvm.org/bugs/show_bug.cgi?id=25360">25360</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O1 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>llvm-bugs@lists.llvm.org
</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
on x86_64-linux-gnu in both 32-bit and 64-bit modes.
This is a regression from 3.7.x.
$ clang-trunk -v
clang version 3.8.0 (trunk 251642)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.2
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/4.8.4
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
small.c:12:18: warning: expression result unused [-Wunused-value]
for (b = 1; b; b)
^
1 warning generated.
$
$ clang-3.7.0 -O1 -c small.c
small.c:12:18: warning: expression result unused [-Wunused-value]
for (b = 1; b; b)
^
1 warning generated.
$
$ clang-trunk -O1 -c small.c
small.c:12:18: warning: expression result unused [-Wunused-value]
for (b = 1; b; b)
^
clang: /tmp/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:2180: virtual bool
{anonymous}::IndVarSimplify::runOnLoop(llvm::Loop*, llvm::LPPassManager&):
Assertion `L->isLCSSAForm(*DT) && "Indvars did not leave the loop in lcssa
form!"' failed.
#0 0x3043058 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x3043058)
#1 0x3041df6 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang+0x3041df6)
#2 0x3042006 (/usr/local/clang-trunk/bin/clang+0x3042006)
#3 0x7f71f0bc7340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x7f71efb62cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x7f71efb660d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#6 0x7f71efb5bb86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#7 0x7f71efb5bc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x29b336b (/usr/local/clang-trunk/bin/clang+0x29b336b)
#9 0x2cdff2f llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2cdff2f)
#10 0x2fb020f llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2fb020f)
#11 0x2c517aa (/usr/local/clang-trunk/bin/clang+0x2c517aa)
#12 0x2fb1ee7 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2fb1ee7)
#13 0xba42c2 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+0xba42c2)
#14 0xb81b18 (/usr/local/clang-trunk/bin/clang+0xb81b18)
#15 0xde41a2 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xde41a2)
#16 0xb84612 clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang+0xb84612)
#17 0x972f26 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x972f26)
#18 0x94952e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x94952e)
#19 0x92ab4c clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x92ab4c)
#20 0x922960 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x922960)
#21 0x908d18 main (/usr/local/clang-trunk/bin/clang+0x908d18)
#22 0x7f71efb4dec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#23 0x920fed _start (/usr/local/clang-trunk/bin/clang+0x920fed)
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 /data2/small.c -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.8.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.8.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir /data2
-ferror-limit 19 -fmessage-length 127 -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 '@fn2'
5. Running pass 'Induction Variable Simplification' on basic block
'%for.body'
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 3.8.0 (trunk 251642)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
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-8ad22f.c
clang: note: diagnostic msg: /tmp/small-8ad22f.sh
clang: note: diagnostic msg:
********************
$
---------------------------------
int a, e, f;
char b, d;
short c, g;
int fn1 ()
{
return a;
}
void fn2 (int p1)
{
for (b = 1; b; b)
{
for (c = 1; c;)
{
p1 = d || 0;
e = fn1 ();
}
if (++p1)
break;
}
for (; g; g++)
p1++;
f = p1;
}</pre>
</div>
</p>
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