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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 --- - crash at -Os and above in 32-bit mode on x86_64-linux-gnu (Assertion `Reg && "Null register has no regunits"' failed)"
href="https://llvm.org/bugs/show_bug.cgi?id=27348">27348</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>crash at -Os and above in 32-bit mode on x86_64-linux-gnu (Assertion `Reg && "Null register has no regunits"' failed)
</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>Windows NT
</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>chengniansun@gmail.com
</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 following code crashes the trunk at -Os and above only in 32-bit mode on
x86_64-linux-gnu.
$: clang-trunk -v
clang version 3.9.0 (trunk 266174)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
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/4.8.5
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/5.3.0
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.3
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.7.4
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.2
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 -m32 -Os -w small.c
clang-3.9:
/tmp/llvm-builder/llvm-source-trunk/include/llvm/MC/MCRegisterInfo.h:554:
llvm::MCRegUnitIterator::MCRegUnitIterator(unsigned int, const
llvm::MCRegisterInfo*): Assertion `Reg && "Null register has no regunits"'
failed.
0 clang-3.9 0x0000000001d7b6e5
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1 clang-3.9 0x0000000001d79676 llvm::sys::RunSignalHandlers() + 54
2 clang-3.9 0x0000000001d79894
3 libpthread.so.0 0x00007f874626a340
4 libc.so.6 0x00007f8745488cc9 gsignal + 57
5 libc.so.6 0x00007f874548c0d8 abort + 328
6 libc.so.6 0x00007f8745481b86
7 libc.so.6 0x00007f8745481c32
8 clang-3.9 0x0000000000d4c408
9 clang-3.9 0x0000000001721d48
llvm::LiveIntervals::addKillFlags(llvm::VirtRegMap const*) + 376
10 clang-3.9 0x00000000018d55cd
11 clang-3.9 0x0000000001780b15
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 357
12 clang-3.9 0x0000000001a01b13
llvm::FPPassManager::runOnFunction(llvm::Function&) + 643
13 clang-3.9 0x0000000001a0215b
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 619
14 clang-3.9 0x0000000001ec255a
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::DataLayout const&, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*) + 4202
15 clang-3.9 0x00000000024e3dba
16 clang-3.9 0x000000000282bbed clang::ParseAST(clang::Sema&, bool, bool)
+ 845
17 clang-3.9 0x00000000024e411e clang::CodeGenAction::ExecuteAction() +
78
18 clang-3.9 0x00000000021ca4ae clang::FrontendAction::Execute() + 286
19 clang-3.9 0x00000000021a2c66
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 310
20 clang-3.9 0x0000000002254ea2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2370
21 clang-3.9 0x0000000000ac1188 cc1_main(llvm::ArrayRef<char const*>,
char const*, void*) + 3288
22 clang-3.9 0x0000000000a7cc7d main + 6125
23 libc.so.6 0x00007f8745473ec5 __libc_start_main + 245
24 clang-3.9 0x0000000000abd1d4
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-3.9 -cc1 -triple
i386-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c
-mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose
-mconstructor-aliases -fuse-init-array -target-cpu pentium4
-momit-leaf-frame-pointer -dwarf-column-info -debugger-tuning=gdb -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.9.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.9.0/include -internal-externc-isystem
/include -internal-externc-isystem /usr/include -Os -w -fdebug-compilation-dir
/data2/c-hunter-results/C/instrument-bugs/REDUCED/20160413-clang-trunk-m32-g-O3-build-060928/delta
-ferror-limit 19 -fmessage-length 175 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o /tmp/small-46bc94.o -x c small.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'small.c'.
4. Running pass 'Virtual Register Rewriter' on function '@fn1'
clang-3.9: error: unable to execute command: Aborted (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 266174)
Target: i386-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-3.9: 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-3.9: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/small-183060.c
clang-3.9: note: diagnostic msg: /tmp/small-183060.sh
clang-3.9: note: diagnostic msg:
********************
$: clang-trunk -m64 -Os -w small.c
$: cat small.c
char a, h, o, q;
volatile short b, n;
int c, e, i, j, l, m, p, r;
unsigned d;
short f;
volatile char g;
volatile int k;
void fn1() {
for (;;) {
for (; o <= 5;) {
if (l > 7)
goto LABEL_XhXhh;
LABEL_lilig:
if (l)
LABEL_lilih:
k;
if (f)
continue;
break;
}
int s = o;
{
char t = f || b;
if (b)
goto LABEL_YhYho;
if (s)
goto LABEL_XhXhg;
}
LABEL_7h7hn:
;
int u = h;
{
LABEL_XhXhg:
;
int v = h || d;
i = ~v;
g;
if (!i)
goto LABEL_MiMiz;
goto LABEL_7h7hn;
LABEL_XhXhh:
e = 1;
}
LABEL_QhQhg:
;
char w;
if (p)
continue;
int x = a;
if (k && x) {
while (j)
;
LABEL_YhYho:
if (h)
goto LABEL_QhQhg;
}
char y = u & p || r / k;
int z = (b ^ (u || k)) * y / z || k;
int t1 = c > q ^ n;
int t2 = p / m;
short t3 = a % n;
if (t2) {
t1 = p;
goto LABEL_lilih;
LABEL_MiMiz:
q = t3 > t1 && t2;
goto LABEL_lilig;
}
printf("l_1936=%llu\n");
goto LABEL_XhXhh;
}
}
int main() { return 0; }
$:</pre>
</div>
</p>
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