https://llvm.org/bugs/show_bug.cgi?id=25576
Bug ID: 25576
Summary: clang crashes at -O1 and above 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
and above 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 253495)
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 -O0 -c small.c
$ clang-3.7.0 -O1 -c small.c
$
$ clang-trunk -O1 -c small.c
clang: /tmp/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:2180: virtual bool
(anonymous namespace)::IndVarSimplify::runOnLoop(llvm::Loop *,
llvm::LPPassManager &): Assertion `L->isLCSSAForm(*DT) && "Indvars did not
leave the loop in lcssa form!"' failed.
#0 0x0000000002f5aea8 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2f5aea8)
#1 0x0000000002f5b617 (/usr/local/clang-trunk/bin/clang+0x2f5b617)
#2 0x00007f4044830340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#3 0x00007f40437cbcc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#4 0x00007f40437cf0d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#5 0x00007f40437c4b86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#6 0x00007f40437c4c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#7 0x0000000002835654 (/usr/local/clang-trunk/bin/clang+0x2835654)
#8 0x0000000002bd7ffe llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2bd7ffe)
#9 0x0000000002ea6ea4 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2ea6ea4)
#10 0x0000000002b3e968 (/usr/local/clang-trunk/bin/clang+0x2b3e968)
#11 0x0000000002ea75b5 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2ea75b5)
#12 0x00000000009f0563 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+0x9f0563)
#13 0x00000000009d1838 (/usr/local/clang-trunk/bin/clang+0x9d1838)
#14 0x0000000000c6a596 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xc6a596)
#15 0x0000000000774f45 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x774f45)
#16 0x0000000000740441
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x740441)
#17 0x000000000071f84e
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x71f84e)
#18 0x00000000007158b8 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang+0x7158b8)
#19 0x000000000071de43 main (/usr/local/clang-trunk/bin/clang+0x71de43)
#20 0x00007f40437b6ec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#21 0x0000000000715347 _start (/usr/local/clang-trunk/bin/clang+0x715347)
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 -O1 -fdebug-compilation-dir /data2
-ferror-limit 19 -fmessage-length 189 -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
'%for.cond.4.preheader'
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 253495)
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-d90086.c
clang: note: diagnostic msg: /tmp/small-d90086.sh
clang: note: diagnostic msg:
********************
$
--------------------------------
unsigned a, b[2];
void
fn1 ()
{
unsigned c;
for (; a;)
if (!c)
for (; c < a; c++)
for (a = 0; a < 2; a++)
b[a] = 0;
}
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