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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 at -O1 and above on x86_64-linux-gnu"
href="https://llvm.org/bugs/show_bug.cgi?id=24726">24726</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>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The current clang trunk (as well as 3.6.x and 3.7.0) crashes when compiling the
following test case at -O1 and above on x86_64-linux-gnu in both 32-bit and
64-bit modes.
This is a regression from 3.5.x.
$ clang-trunk -v
clang version 3.8.0 (trunk 246931)
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/4.8.2
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-3.5 -O1 -c small.c
$
$ clang-trunk -O1 -c small.c
clang: /tmp/llvm/lib/Support/APInt.cpp:1941: static void
llvm::APInt::udivrem(const llvm::APInt &, const llvm::APInt &, llvm::APInt &,
llvm::APInt &): Assertion `RHS.VAL != 0 && "Divide by zero?"' failed.
#0 0x2c0b36d llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2c0b36d)
#1 0x2c0a9f6 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang+0x2c0a9f6)
#2 0x2c0c80e (/usr/local/clang-trunk/bin/clang+0x2c0c80e)
#3 0x7f0327ba7340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x7f0326b42cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x7f0326b460d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#6 0x7f0326b3bb86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#7 0x7f0326b3bc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x2bcdda8 llvm::APInt::udivrem(llvm::APInt const&, llvm::APInt const&,
llvm::APInt&, llvm::APInt&) (/usr/local/clang-trunk/bin/clang+0x2bcdda8)
#9 0x270255a (/usr/local/clang-trunk/bin/clang+0x270255a)
#10 0x270196d (/usr/local/clang-trunk/bin/clang+0x270196d)
#11 0x2702f9d (/usr/local/clang-trunk/bin/clang+0x2702f9d)
#12 0x26a96cb (/usr/local/clang-trunk/bin/clang+0x26a96cb)
#13 0x26ab246 (/usr/local/clang-trunk/bin/clang+0x26ab246)
#14 0x26ac559 (/usr/local/clang-trunk/bin/clang+0x26ac559)
#15 0x2b697a4 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2b697a4)
#16 0x2850e48 (/usr/local/clang-trunk/bin/clang+0x2850e48)
#17 0x2b69ec5 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2b69ec5)
#18 0x98ba83 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+0x98ba83)
#19 0x97ca97 (/usr/local/clang-trunk/bin/clang+0x97ca97)
#20 0xbaaad6 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xbaaad6)
#21 0x7702c5 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x7702c5)
#22 0x73ee1c clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x73ee1c)
#23 0x720637 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x720637)
#24 0x716a25 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x716a25)
#25 0x71ecef main (/usr/local/clang-trunk/bin/clang+0x71ecef)
#26 0x7f0326b2dec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#27 0x7164b1 _start (/usr/local/clang-trunk/bin/clang+0x7164b1)
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/c-hunter/test/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/c-hunter/test -ferror-limit 19 -fmessage-length 137 -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 'Combine redundant instructions' on function '@fn1'
clang: error: unable to execute command: Aborted
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.8.0 (trunk 246931)
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-e189be.c
clang: note: diagnostic msg: /tmp/small-e189be.sh
clang: note: diagnostic msg:
********************
$
-----------------------------------
int a, b, c, d;
int
fn1 ()
{
int t;
for (a = 0; a < 1; a++)
b %= 1;
t = b;
b = c || d < (t *= c);
return c * (t / 2) ? 0 : (b = 0);
}</pre>
</div>
</p>
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