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<base href="https://bugs.llvm.org/">
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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 with "-mllvm -enable-newgvn": "Seem to have processed the same Value a lot""
href="https://bugs.llvm.org/show_bug.cgi?id=32838">32838</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes with "-mllvm -enable-newgvn": "Seem to have processed the same Value a lot"
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>helloqirun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The following code crashes the current trunk version at "-O2" and above with
"-mllvm -enable-newgvn". Level "-O1" works fine.
$ clang-trunk -v
clang version 5.0.0 (trunk 301523)
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
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.1.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/3.4.6
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/4.8
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/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.1.1
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/6.1.0
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0
Selected GCC installation: /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/6.1.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$ clang-trunk -O2 -mllvm -enable-newgvn abc.c
abc.c:22:9: warning: division by zero is undefined [-Wdivision-by-zero]
0 | 0 / 0 ? p1 /= 4 : 0;
^ ~
clang-5.0: /home/absozero/trunk/llvm/lib/Transforms/Scalar/NewGVN.cpp:2363:
void (anonymous namespace)::NewGVN::updateProcessedCount(llvm::Value *):
Assertion `ProcessedCount[V] < 100 && "Seem to have processed the same Value a
lot"' failed.
#0 0x0000000001bfc884 PrintStackTraceSignalHandler(void*)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x1bfc884)
#1 0x0000000001bfcbb6 SignalHandler(int)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x1bfcbb6)
#2 0x00007febe33a3330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#3 0x00007febe1f20c37 gsignal
/build/eglibc-oGUzwX/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#4 0x00007febe1f24028 abort
/build/eglibc-oGUzwX/eglibc-2.19/stdlib/abort.c:91:0
#5 0x00007febe1f19bf6 __assert_fail_base
/build/eglibc-oGUzwX/eglibc-2.19/assert/assert.c:92:0
#6 0x00007febe1f19ca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#7 0x0000000001aff8b4 (anonymous
namespace)::NewGVN::updateProcessedCount(llvm::Value*)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x1aff8b4)
#8 0x0000000001af85a0 (anonymous
namespace)::NewGVN::iterateTouchedInstructions()
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x1af85a0)
#9 0x0000000001af2b06 (anonymous namespace)::NewGVN::runGVN()
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x1af2b06)
#10 0x0000000001af0496 NewGVNLegacyPass::runOnFunction(llvm::Function&)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x1af0496)
#11 0x00000000017a986f llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x17a986f)
#12 0x00000000025e2d46 (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x25e2d46)
#13 0x00000000017a9fc5 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x17a9fc5)
#14 0x0000000001d83d0b 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> >)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x1d83d0b)
#15 0x0000000002473147
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x2473147)
#16 0x00000000028cfe26 clang::ParseAST(clang::Sema&, bool, bool)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x28cfe26)
#17 0x0000000002151468 clang::FrontendAction::Execute()
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x2151468)
#18 0x0000000002106031
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x2106031)
#19 0x00000000021d4840
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x21d4840)
#20 0x00000000008380ac cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/home/absozero/trunk/root-clang/bin/clang-5.0+0x8380ac)
#21 0x0000000000836045 main
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x836045)
#22 0x00007febe1f0bf45 __libc_start_main
/build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:321:0
#23 0x00000000008331f9 _start
(/home/absozero/trunk/root-clang/bin/clang-5.0+0x8331f9)
Stack dump:
0. Program arguments: /home/absozero/trunk/root-clang/bin/clang-5.0 -cc1
-triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name abc.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
/home/absozero/trunk/root-clang/lib/clang/5.0.0 -internal-isystem
/usr/local/include -internal-isystem
/home/absozero/trunk/root-clang/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/absozero/projects/reduction/crash2 -ferror-limit
19 -fmessage-length 114 -fobjc-runtime=gcc -fdiagnostics-show-option
-fcolor-diagnostics -vectorize-loops -vectorize-slp -mllvm -enable-newgvn -o
/tmp/abc-ec9ff3.o -x c abc.c
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'CallGraph Pass Manager' on module 'abc.c'.
4. Running pass 'Global Value Numbering' on function '@fn1'
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 301523)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/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/abc-b0ac91.c
clang-5.0: note: diagnostic msg: /tmp/abc-b0ac91.sh
clang-5.0: note: diagnostic msg:
********************
$ cat abc.c
int a, d;
char b, f;
short c;
int *e;
void fn1(long p1) {
c = 3 != a;
if (c) {
b = 3;
for (; b;)
for (; f;)
;
if (e)
for (; *e;) {
char g = g = 4;
for (; g;)
l1:
d--;
}
for (; c;)
;
}
0 | 0 / 0 ? p1 /= 4 : 0;
goto l1;
}</pre>
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