[LLVMbugs] [Bug 22337] New: clang crashes on valid code at -Os and above on x86_64-linux-gnu (in 32-bit mode)
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Mon Jan 26 15:19:16 PST 2015
http://llvm.org/bugs/show_bug.cgi?id=22337
Bug ID: 22337
Summary: clang crashes on valid code at -Os and above on
x86_64-linux-gnu (in 32-bit mode)
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: llvmbugs at cs.uiuc.edu
Classification: Unclassified
The current clang trunk crashes when compiling the following test case on
x86_64-linux-gnu at -Os and above in the 32-bit mode (but not in 64-bit mode).
This is a regression from 3.5.x.
$ clang-trunk -v
clang version 3.7.0 (trunk 227058)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
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/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -m32 -O1 -c small.c
small.c:14:11: warning: expression result unused [-Wunused-value]
for (;; 0)
^
small.c:1:5: warning: tentative array definition assumed to have one element
int a[], b, c, d, e, f;
^
2 warnings generated.
$ clang-trunk -m64 -Os -c small.c
small.c:14:11: warning: expression result unused [-Wunused-value]
for (;; 0)
^
small.c:1:5: warning: tentative array definition assumed to have one element
int a[], b, c, d, e, f;
^
2 warnings generated.
$ clang-3.5.0 -m32 -Os -c small.c
small.c:14:11: warning: expression result unused [-Wunused-value]
for (;; 0)
^
small.c:1:5: warning: tentative array definition assumed to have one element
int a[], b, c, d, e, f;
^
2 warnings generated.
$
$ clang-trunk -m32 -Os -c small.c
small.c:14:11: warning: expression result unused [-Wunused-value]
for (;; 0)
^
small.c:1:5: warning: tentative array definition assumed to have one element
int a[], b, c, d, e, f;
^
clang: /tmp/llvm/include/llvm/Support/Casting.h:237: typename cast_retty<X, Y
*>::ret_type llvm::cast(Y *) [X = llvm::Instruction, Y = llvm::User]: Assertion
`isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
#0 0x2a512e8 llvm::sys::PrintStackTrace(_IO_FILE*)
(/usr/local/clang-trunk/bin/clang+0x2a512e8)
#1 0x2a523bb (/usr/local/clang-trunk/bin/clang+0x2a523bb)
#2 0x7f61cb0a0cb0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0xfcb0)
#3 0x7f61c9ebf0d5 gsignal
/build/buildd/eglibc-2.15/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:64:0
#4 0x7f61c9ec283b abort /build/buildd/eglibc-2.15/stdlib/abort.c:93:0
#5 0x7f61c9eb7d9e __assert_fail_base
/build/buildd/eglibc-2.15/assert/assert.c:55:0
#6 0x7f61c9eb7e42 (/lib/x86_64-linux-gnu/libc.so.6+0x2ee42)
#7 0x24e8ddf (/usr/local/clang-trunk/bin/clang+0x24e8ddf)
#8 0x2766abb llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2766abb)
#9 0x29cff91 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x29cff91)
#10 0x26b8ca8 (/usr/local/clang-trunk/bin/clang+0x26b8ca8)
#11 0x29d06a5 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x29d06a5)
#12 0x9164a3 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::StringRef, llvm::Module*, clang::BackendAction,
llvm::raw_ostream*) (/usr/local/clang-trunk/bin/clang+0x9164a3)
#13 0x90ab65 (/usr/local/clang-trunk/bin/clang+0x90ab65)
#14 0xafe6a3 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xafe6a3)
#15 0x70c0fe clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x70c0fe)
#16 0x6de90c clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x6de90c)
#17 0x6c01a6 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x6c01a6)
#18 0x6b6e72 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x6b6e72)
#19 0x6be93b main (/usr/local/clang-trunk/bin/clang+0x6be93b)
#20 0x7f61c9eaa76d __libc_start_main
/build/buildd/eglibc-2.15/csu/libc-start.c:258:0
#21 0x6b6ad9 _start (/usr/local/clang-trunk/bin/clang+0x6b6ad9)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang -cc1 -triple
i386-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c
-mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose
-mconstructor-aliases -fuse-init-array -target-cpu pentium4
-target-linker-version 2.22 -momit-leaf-frame-pointer -dwarf-column-info
-coverage-file
/data2/c-hunter-results/C/trans-bugs/REDUCED/20150124-clang-m32-O2-O3-Os-build-test133973/small.c
-resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.7.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.7.0/include -internal-externc-isystem
/include -internal-externc-isystem /usr/include -Os -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/REDUCED/20150124-clang-m32-O2-O3-Os-build-test133973
-ferror-limit 19 -fmessage-length 97 -mstackrealign -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 '@fn2'
5. Running pass 'Rotate Loops' on basic block '%for.cond2'
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 3.7.0 (trunk 227058)
Target: i386-unknown-linux-gnu
Thread model: posix
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-76769b.c
clang: note: diagnostic msg: /tmp/small-76769b.sh
clang: note: diagnostic msg:
********************
$
--------------------------
int a[], b, c, d, e, f;
char g;
int
fn1 (int p)
{
return p;
}
int
fn2 ()
{
int h[9];
for (;; 0)
{
int i = 0;
for (;; i--)
{
int j[9];
{
int k[9];
for (; f;)
{
c++;
if (b)
break;
e = a[i];
}
if (d)
break;
if (!fn1 (0))
return g;
}
}
}
}
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