[llvm-bugs] [Bug 28103] New: clang crashes on valid code at -O3 on x86_64-linux-gnu: Assertion `isComplete() && "bad loop DFS"' failed
via llvm-bugs
llvm-bugs at lists.llvm.org
Sun Jun 12 23:36:20 PDT 2016
https://llvm.org/bugs/show_bug.cgi?id=28103
Bug ID: 28103
Summary: clang crashes on valid code at -O3 on
x86_64-linux-gnu: Assertion `isComplete() && "bad loop
DFS"' failed
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangbugs at nondot.org
Reporter: su at cs.ucdavis.edu
CC: llvm-bugs at lists.llvm.org
Classification: Unclassified
The current clang trunk crashes when compiling the following test case on
x86_64-linux-gnu at -O3 in both 32-bit and 64-bit modes.
This is a regression from 3.8.x.
$ clang-trunk -v
clang version 3.9.0 (trunk 272507)
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/4.9.3
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
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-3.8 -O3 -c small.c
$ clang-trunk -O2 -c small.c
$
$ clang-trunk -O3 -c small.c
clang-3.9:
/tmp/llvm-builder/llvm-source-trunk/include/llvm/Analysis/LoopIterator.h:71:
llvm::LoopBlocksDFS::POIterator llvm::LoopBlocksDFS::beginPostorder() const:
Assertion `isComplete() && "bad loop DFS"' failed.
#0 0x0000000001e23f35 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1e23f35)
#1 0x0000000001e21dc6 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-3.9+0x1e21dc6)
#2 0x0000000001e21fe4 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-3.9+0x1e21fe4)
#3 0x00007f11bcffe340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x00007f11bc21ccc9 gsignal
/build/eglibc-3GlaMS/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f11bc2200d8 abort
/build/eglibc-3GlaMS/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f11bc215b86 __assert_fail_base
/build/eglibc-3GlaMS/eglibc-2.19/assert/assert.c:92:0
#7 0x00007f11bc215c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x000000000166f093 llvm::LoopInfo::markAsRemoved(llvm::Loop*)
(/usr/local/clang-trunk/bin/clang-3.9+0x166f093)
#9 0x0000000001e83504 llvm::UnrollLoop(llvm::Loop*, unsigned int, unsigned int,
bool, bool, bool, unsigned int, llvm::LoopInfo*, llvm::ScalarEvolution*,
llvm::DominatorTree*, llvm::AssumptionCache*, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x1e83504)
#10 0x0000000001d1d38c tryToUnrollLoop(llvm::Loop*, llvm::DominatorTree&,
llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::TargetTransformInfo const&,
llvm::AssumptionCache&, bool, llvm::Optional<unsigned int>,
llvm::Optional<unsigned int>, llvm::Optional<bool>, llvm::Optional<bool>)
(/usr/local/clang-trunk/bin/clang-3.9+0x1d1d38c)
#11 0x0000000001d1e5bc (anonymous
namespace)::LoopUnroll::runOnLoop(llvm::Loop*, llvm::LPPassManager&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1d1e5bc)
#12 0x0000000002706c3b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-3.9+0x2706c3b)
#13 0x0000000001a86883 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1a86883)
#14 0x00000000026e4937 (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-3.9+0x26e4937)
#15 0x0000000001a86fc8 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1a86fc8)
#16 0x0000000001f73be8 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*) (/usr/local/clang-trunk/bin/clang-3.9+0x1f73be8)
#17 0x00000000025cfe9d
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/usr/local/clang-trunk/bin/clang-3.9+0x25cfe9d)
#18 0x00000000029342dd clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x29342dd)
#19 0x00000000025d01fe clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-3.9+0x25d01fe)
#20 0x000000000229a76e clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-3.9+0x229a76e)
#21 0x00000000022700e6
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-3.9+0x22700e6)
#22 0x00000000023284c2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-3.9+0x23284c2)
#23 0x0000000000aeef38 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-3.9+0xaeef38)
#24 0x0000000000aa3134 main (/usr/local/clang-trunk/bin/clang-3.9+0xaa3134)
#25 0x00007f11bc207ec5 __libc_start_main
/build/eglibc-3GlaMS/eglibc-2.19/csu/libc-start.c:321:0
#26 0x0000000000aeafa4 _start (/usr/local/clang-trunk/bin/clang-3.9+0xaeafa4)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-3.9 -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
-coverage-file /data2/small.c -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
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O3 -fdebug-compilation-dir /data2
-ferror-limit 19 -fmessage-length 147 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-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 '@fn3'
5. Running pass 'Unroll loops' on basic block '%for.cond1.i.us.us'
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 272507)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ 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-91162d.c
clang-3.9: note: diagnostic msg: /tmp/small-91162d.sh
clang-3.9: note: diagnostic msg:
********************
$
--------------------------------------
int a, b, c[9];
char
fn1 (int p1)
{
return p1;
}
static void
fn2 ()
{
int d;
for (; b;)
for (d = 0; d < 8; d++)
{
if (c[d + 1])
b = a;
for (; b; b++)
fn1 (a);
if (a)
for (;;)
;
}
}
void
fn3 ()
{
fn2 ();
}
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