[llvm-bugs] [Bug 25538] New: clang crashes on valid code at -O2 on x86_64-linux-gnu
via llvm-bugs
llvm-bugs at lists.llvm.org
Sun Nov 15 13:24:12 PST 2015
https://llvm.org/bugs/show_bug.cgi?id=25538
Bug ID: 25538
Summary: clang crashes on valid code at -O2 on x86_64-linux-gnu
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 -O2 in the 64-bit mode (but not in the 32-bit mode).
This is a regression from 3.7.x.
$ clang-trunk -v
clang version 3.8.0 (trunk 253143)
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/4.9.2
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.1.0
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/4.8.4
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 -m64 -Os -c small.c
$ clang-3.7.0 -m64 -O2 -c small.c
$
$ clang-trunk -m64 -O2 -c small.c
clang: /tmp/llvm/lib/Transforms/Utils/LoopUnroll.cpp:567: bool
llvm::UnrollLoop(llvm::Loop *, unsigned int, unsigned int, bool, bool, unsigned
int, llvm::LoopInfo *, llvm::Pass *, llvm::LPPassManager *,
llvm::AssumptionCache *): Assertion `OuterL->isLCSSAForm(*DT) && "Loops should
be in LCSSA form after loop-unroll."' failed.
#0 0x0000000002f58298 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2f58298)
#1 0x0000000002f58a07 (/usr/local/clang-trunk/bin/clang+0x2f58a07)
#2 0x00007f5f97897340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#3 0x00007f5f96832cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#4 0x00007f5f968360d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#5 0x00007f5f9682bb86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#6 0x00007f5f9682bc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#7 0x0000000002a7cada llvm::UnrollLoop(llvm::Loop*, unsigned int, unsigned int,
bool, bool, unsigned int, llvm::LoopInfo*, llvm::Pass*, llvm::LPPassManager*,
llvm::AssumptionCache*) (/usr/local/clang-trunk/bin/clang+0x2a7cada)
#8 0x00000000028a0361 (/usr/local/clang-trunk/bin/clang+0x28a0361)
#9 0x0000000002bd560e llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2bd560e)
#10 0x0000000002ea4314 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2ea4314)
#11 0x0000000002b3bcd8 (/usr/local/clang-trunk/bin/clang+0x2b3bcd8)
#12 0x0000000002ea4a25 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2ea4a25)
#13 0x0000000000a03963 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+0xa03963)
#14 0x00000000009e5338 (/usr/local/clang-trunk/bin/clang+0x9e5338)
#15 0x0000000000c7dc76 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xc7dc76)
#16 0x0000000000788915 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x788915)
#17 0x0000000000753ccb
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x753ccb)
#18 0x000000000073313e
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x73313e)
#19 0x00000000007291a8 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang+0x7291a8)
#20 0x0000000000731733 main (/usr/local/clang-trunk/bin/clang+0x731733)
#21 0x00007f5f9681dec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#22 0x0000000000728c3d _start (/usr/local/clang-trunk/bin/clang+0x728c3d)
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 /data2/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 -O2 -fdebug-compilation-dir /data2
-ferror-limit 19 -fmessage-length 164 -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 '@fn1'
5. Running pass 'Unroll loops' on basic block '%for.cond.14'
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 253143)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/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-3fe584.c
clang: note: diagnostic msg: /tmp/small-3fe584.sh
clang: note: diagnostic msg:
********************
$
---------------------------------------
short a;
int b, c[1] = { 4 }, d, e, f;
void
fn1 ()
{
int g = 10;
lbl:
for (; b; b++)
{
e = 0;
for (; e < 8; e++)
{
for (;;)
{
for (; f;)
;
if (c[e + b])
{
if (d)
{
if (g)
break;
goto lbl;
}
}
else
break;
f = 0;
for (; f; f++)
g = 0;
}
if (a)
goto lbl;
}
}
}
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