https://llvm.org/bugs/show_bug.cgi?id=28882
Bug ID: 28882
Summary: clang crashes on valid code at -O1 and above on
x86_64-linux-gnu Running pass 'Early GVN Hoisting of
Expressions'
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: helloqi...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The current clang trunk crashes at -O1 and above when compiling the following
test case on x86_64-linux-gnu in both 32-bit and 64-bit modes.
$ clang-trunk -v
clang version 4.0.0 (trunk 277804)
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 -O1 abc.c
abc.c:8:13: warning: incompatible pointer types initializing 'char *' with an
expression of type 'int *'
[-Wincompatible-pointer-types]
char *k = &i;
^ ~~
abc.c:17:21: warning: expression result unused [-Wunused-value]
for (; l; *m)
^~
abc.c:28:5: warning: expression result unused [-Wunused-value]
f;
^
abc.c:29:11: warning: unsequenced modification and access to 'i'
[-Wunsequenced]
i |= (i = c) & f;
~~ ^
abc.c:30:3: warning: expression result unused [-Wunused-value]
f ?: 0;
^~~~~~
abc.c:31:9: warning: division by zero is undefined [-Wdivision-by-zero]
if (0 / 0)
^ ~
abc.c:35:1: warning: control may reach end of non-void function [-Wreturn-type]
}
^
clang-4.0: /home/absozero/trunk/llvm/lib/Transforms/Scalar/GVNHoist.cpp:472:
bool (anonymous namespace)::GVNHoist::safeToHoistLdSt(const llvm::Instruction
*, const llvm::Instruction *, llvm::MemoryUseOrDef *, (anonymous
namespace)::GVNHoist::InsKind, int &): Assertion `MSSA->locallyDominates(D, U)'
failed.
#0 0x0000000001923ad5 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x1923ad5)
#1 0x00000000019241a6 SignalHandler(int)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x19241a6)
#2 0x00007f90978d5330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#3 0x00007f9096452c37 gsignal
/build/eglibc-oGUzwX/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#4 0x00007f9096456028 abort
/build/eglibc-oGUzwX/eglibc-2.19/stdlib/abort.c:91:0
#5 0x00007f909644bbf6 __assert_fail_base
/build/eglibc-oGUzwX/eglibc-2.19/assert/assert.c:92:0
#6 0x00007f909644bca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#7 0x00000000017b4a36 (/home/absozero/trunk/root-clang/bin/clang-4.0+0x17b4a36)
#8 0x00000000017b2ba3 (anonymous
namespace)::GVNHoist::computeInsertionPoints(llvm::DenseMap<std::pair<unsigned
int, unsigned int>, llvm::SmallVector<llvm::Instruction*, 4u>,
llvm::DenseMapInfo<std::pair<unsigned int, unsigned int> >,
llvm::detail::DenseMapPair<std::pair<unsigned int, unsigned int>,
llvm::SmallVector<llvm::Instruction*, 4u> > > const&,
llvm::SmallVector<std::pair<llvm::BasicBlock*,
llvm::SmallVector<llvm::Instruction*, 4u> >, 4u>&, (anonymous
namespace)::GVNHoist::InsKind)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x17b2ba3)
#9 0x00000000017b0fa6 (anonymous namespace)::GVNHoist::run(llvm::Function&)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x17b0fa6)
#10 0x00000000017b6233 (anonymous
namespace)::GVNHoistLegacyPass::runOnFunction(llvm::Function&)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x17b6233)
#11 0x00000000015432cf llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x15432cf)
#12 0x0000000001542ab9
llvm::legacy::FunctionPassManagerImpl::run(llvm::Function&)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x1542ab9)
#13 0x0000000001a9adb7 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
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-4.0+0x1a9adb7)
#14 0x000000000216086c
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x216086c)
#15 0x00000000025288c6 clang::ParseAST(clang::Sema&, bool, bool)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x25288c6)
#16 0x0000000001e4a9e5 clang::FrontendAction::Execute()
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x1e4a9e5)
#17 0x0000000001e14011
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x1e14011)
#18 0x0000000001edd024
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x1edd024)
#19 0x000000000078a62c cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/home/absozero/trunk/root-clang/bin/clang-4.0+0x78a62c)
#20 0x0000000000788abd main
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x788abd)
#21 0x00007f909643df45 __libc_start_main
/build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:321:0
#22 0x0000000000786042 _start
(/home/absozero/trunk/root-clang/bin/clang-4.0+0x786042)
Stack dump:
0. Program arguments: /home/absozero/trunk/root-clang/bin/clang-4.0 -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/bin/../lib/clang/4.0.0 -internal-isystem
/usr/local/include -internal-isystem
/home/absozero/trunk/root-clang/bin/../lib/clang/4.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O1
-fdebug-compilation-dir /home/absozero/projects/reduction/crash -ferror-limit
19 -fmessage-length 130 -fobjc-runtime=gcc -fdiagnostics-show-option
-fcolor-diagnostics -o /tmp/abc-22795c.o -x c abc.c
1. <eof> parser at end of file
2. Per-function optimization
3. Running pass 'Early GVN Hoisting of Expressions' on function '@fn1'
clang-4.0: error: unable to execute command: Aborted (core dumped)
clang-4.0: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 4.0.0 (trunk 277804)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-4.0: 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-4.0: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-4.0: note: diagnostic msg: /tmp/abc-e81761.c
clang-4.0: note: diagnostic msg: /tmp/abc-e81761.sh
clang-4.0: note: diagnostic msg:
********************
$ cat abc.c
typedef short int16_t;
int16_t a, b, c, d, e, f, g;
int h;
int16_t fn1() {
int i = 0, j = a = d = e = c;
if (fn1())
for (;;) {
char *k = &i;
{
short l;
if (b) {
for (; k;)
return 0;
int *m = &j;
if (a)
lblCDAE7005:
for (; l; *m)
;
}
}
lbl5BA3649E:;
}
j = e = g = b;
j = (j ? b : i) ? h : 0;
e = a = f = b = 0;
f = 0;
if (f)
f;
i |= (i = c) & f;
f ?: 0;
if (0 / 0)
goto lblCDAE7005;
if (c)
goto lbl5BA3649E;
}
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