https://llvm.org/bugs/show_bug.cgi?id=25372
Bug ID: 25372
Summary: clang crashes on valid code at -O1, -Os, and -O2 on
x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The current clang trunk crashes when compiling the following test case at -O1,
-Os, and -O2 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 251762)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
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
$ clang-trunk -O3 -c small.c
$ clang-3.7.0 -O1 -c small.c
$
$ clang-trunk -O1 -c small.c
clang: /tmp/llvm/include/llvm/Support/Casting.h:237: typename
llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::Instruction; Y
= llvm::Value; typename llvm::cast_retty<X, Y*>::ret_type =
llvm::Instruction*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of
incompatible type!"' failed.
#0 0x2f00e48 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2f00e48)
#1 0x2efff16 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang+0x2efff16)
#2 0x2f00134 (/usr/local/clang-trunk/bin/clang+0x2f00134)
#3 0x7f5d1c1f5340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x7f5d1b203cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x7f5d1b2070d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#6 0x7f5d1b1fcb86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#7 0x7f5d1b1fcc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x959dd6 _init (/usr/local/clang-trunk/bin/clang+0x959dd6)
#9 0x1be0871 (/usr/local/clang-trunk/bin/clang+0x1be0871)
#10 0x2c384ac llvm::SCEVExpander::replaceCongruentIVs(llvm::Loop*,
llvm::DominatorTree const*, llvm::SmallVectorImpl<llvm::WeakVH>&,
llvm::TargetTransformInfo const*) (/usr/local/clang-trunk/bin/clang+0x2c384ac)
#11 0x28c1f80 (/usr/local/clang-trunk/bin/clang+0x28c1f80)
#12 0x2bccddb llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2bccddb)
#13 0x2e79633 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2e79633)
#14 0x2b40a30 (/usr/local/clang-trunk/bin/clang+0x2b40a30)
#15 0x2e79d78 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2e79d78)
#16 0xc978ca 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+0xc978ca)
#17 0xc7809a (/usr/local/clang-trunk/bin/clang+0xc7809a)
#18 0xe8e84d clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xe8e84d)
#19 0xc7817e clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang+0xc7817e)
#20 0xaa4ae6 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0xaa4ae6)
#21 0xa7e4a1 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0xa7e4a1)
#22 0xa64533 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0xa64533)
#23 0xa5b800 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0xa5b800)
#24 0xa1b308 main (/usr/local/clang-trunk/bin/clang+0xa1b308)
#25 0x7f5d1b1eeec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#26 0xa5a367 _start (/usr/local/clang-trunk/bin/clang+0xa5a367)
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 /home/su/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 /home/su
-ferror-limit 19 -fmessage-length 132 -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 '@fn1'
5. Running pass 'Induction Variable Simplification' on basic block '%if.end'
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 251762)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang: 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: 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-068bbe.c
clang: note: diagnostic msg: /tmp/small-068bbe.sh
clang: note: diagnostic msg:
********************
$
------------------------------
int a, b, c, e, f;
void
fn1 ()
{
int g = b = 1, h = 1;
for (; !b;)
for (;;)
{
g = a;
break;
}
if (g)
lbl:
c = h = 0;
else
c = e = 2;
if (a)
goto lbl;
c = f & h;
}
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