[LLVMbugs] [Bug 21445] New: clang crashes on valid code at -O1 and above on x86_64-linux-gnu
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Sat Nov 1 11:43:56 PDT 2014
http://llvm.org/bugs/show_bug.cgi?id=21445
Bug ID: 21445
Summary: clang crashes on valid code 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: unassignedclangbugs at nondot.org
Reporter: su at cs.ucdavis.edu
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
The current clang trunk and 3.5.0 crash when compiling the following test case
at -O1 and above in both 32-bit and 64-bit modes on x86_64-linux-gnu.
This is a regression from clang 3.4.x.
$ clang-trunk -v
clang version 3.6.0 (trunk 220897)
Target: x86_64-unknown-linux-gnu
Thread model: posix
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 -O0 -c small.c
$ clang-3.4.2 -O1 -c small.c
$
$ clang-trunk -O1 -c small.c
clang: /tmp/llvm/include/llvm/Support/Casting.h:237: typename cast_retty<X, Y
*>::ret_type llvm::cast(Y *) [X = llvm::Instruction, Y = llvm::Value]:
Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
#0 0x28de3fa llvm::sys::PrintStackTrace(_IO_FILE*)
(/usr/local/clang-trunk/bin/clang+0x28de3fa)
#1 0x28dfabb (/usr/local/clang-trunk/bin/clang+0x28dfabb)
#2 0x7f9caa08acb0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0xfcb0)
#3 0x7f9ca93c30d5 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x360d5)
#4 0x7f9ca93c683b abort (/lib/x86_64-linux-gnu/libc.so.6+0x3983b)
#5 0x7f9ca93bbd9e (/lib/x86_64-linux-gnu/libc.so.6+0x2ed9e)
#6 0x7f9ca93bbe42 (/lib/x86_64-linux-gnu/libc.so.6+0x2ee42)
#7 0x24c3949 (/usr/local/clang-trunk/bin/clang+0x24c3949)
#8 0x24c0c54 (/usr/local/clang-trunk/bin/clang+0x24c0c54)
#9 0x247dcfb (/usr/local/clang-trunk/bin/clang+0x247dcfb)
#10 0x247ea30 (/usr/local/clang-trunk/bin/clang+0x247ea30)
#11 0x286d513 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x286d513)
#12 0x286d78b llvm::FPPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x286d78b)
#13 0x286dce7 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x286dce7)
#14 0x8f5d33 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+0x8f5d33)
#15 0x8eaa05 (/usr/local/clang-trunk/bin/clang+0x8eaa05)
#16 0xaed043 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xaed043)
#17 0x6fc02e clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x6fc02e)
#18 0x6cf3cc clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x6cf3cc)
#19 0x6b1622 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x6b1622)
#20 0x6a7d77 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x6a7d77)
#21 0x6afccb main (/usr/local/clang-trunk/bin/clang+0x6afccb)
#22 0x7f9ca93ae76d __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2176d)
#23 0x6a79e9 _start (/usr/local/clang-trunk/bin/clang+0x6a79e9)
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 2.22 -momit-leaf-frame-pointer -dwarf-column-info
-coverage-file /home/su/small.c -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.6.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.6.0/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 113 -mstackrealign -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 'Function Pass Manager' on module 'small.c'.
4. Running pass 'Combine redundant instructions' on function '@fn1'
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 3.6.0 (trunk 220897)
Target: x86_64-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-de8c1c.c
clang: note: diagnostic msg: /tmp/small-de8c1c.sh
clang: note: diagnostic msg:
********************
$
----------------------------
int b[2], d;
static int *c = &b[1];
unsigned char e, g;
void
fn1 ()
{
int *h = &d;
g = (c != h) - 1;
if (e * g)
while (1)
;
}
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