[llvm-bugs] [Bug 24804] New: clang crashes on valid code at -O1 and above on x86_64-linux-gnu (in 64-bit mode)
via llvm-bugs
llvm-bugs at lists.llvm.org
Sun Sep 13 17:03:07 PDT 2015
https://llvm.org/bugs/show_bug.cgi?id=24804
Bug ID: 24804
Summary: clang crashes on valid code at -O1 and above on
x86_64-linux-gnu (in 64-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: llvm-bugs at 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 64-bit mode (but not in 32-bit mode).
This is a regression from 3.7.x.
$ clang-trunk -v
clang version 3.8.0 (trunk 247529)
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/4.8.2
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 -O0 -c small.c
$ clang-trunk -m32 -O1 -c small.c
$ clang-3.7.0 -m64 -O1 -c small.c
$
$ clang-trunk -m64 -O1 -c small.c
While deleting: i64 %indvars.iv.next
Use still stuck around after Def is destroyed: %indvars.iv = phi i64 [ 0,
%entry ], [ %indvars.iv.next, %for.inc.12 ]
clang: /tmp/llvm/lib/IR/Value.cpp:82: virtual llvm::Value::~Value(): Assertion
`use_empty() && "Uses remain when a value is destroyed!"' failed.
#0 0x2dcc18d llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2dcc18d)
#1 0x2dcb816 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang+0x2dcb816)
#2 0x2dcd98e (/usr/local/clang-trunk/bin/clang+0x2dcd98e)
#3 0x7fea9b9f6340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x7fea9a991cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x7fea9a9950d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#6 0x7fea9a98ab86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#7 0x7fea9a98ac32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x2d47c27 (/usr/local/clang-trunk/bin/clang+0x2d47c27)
#9 0x2d09e09 (/usr/local/clang-trunk/bin/clang+0x2d09e09)
#10 0x2c21374 (/usr/local/clang-trunk/bin/clang+0x2c21374)
#11 0x2c1f60b llvm::BasicBlock::~BasicBlock()
(/usr/local/clang-trunk/bin/clang+0x2c1f60b)
#12 0x2c1f759 llvm::BasicBlock::~BasicBlock()
(/usr/local/clang-trunk/bin/clang+0x2c1f759)
#13 0x2c1f980 (/usr/local/clang-trunk/bin/clang+0x2c1f980)
#14 0x27111b8 (/usr/local/clang-trunk/bin/clang+0x27111b8)
#15 0x2a6f46e llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2a6f46e)
#16 0x2d1bce4 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2d1bce4)
#17 0x29d7688 (/usr/local/clang-trunk/bin/clang+0x29d7688)
#18 0x2d1c405 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2d1c405)
#19 0x9d0613 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+0x9d0613)
#20 0x9b2df3 (/usr/local/clang-trunk/bin/clang+0x9b2df3)
#21 0xc38fa6 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xc38fa6)
#22 0x775145 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x775145)
#23 0x7424cc clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x7424cc)
#24 0x722227 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x722227)
#25 0x718275 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x718275)
#26 0x7208bf main (/usr/local/clang-trunk/bin/clang+0x7208bf)
#27 0x7fea9a97cec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#28 0x717d09 _start (/usr/local/clang-trunk/bin/clang+0x717d09)
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 119 -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 'Delete dead loops' on basic block '%for.body.3'
clang: error: unable to execute command: Aborted
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.8.0 (trunk 247529)
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-24799e.c
clang: note: diagnostic msg: /tmp/small-24799e.sh
clang: note: diagnostic msg:
********************
$
-----------------------------------
int a[2][1], b, c;
void
fn1 ()
{
for (b = 0; b < 1; b++)
for (c = 0; c < 1; c++)
{
int i;
if (a[b + 1][b])
for (i = 0; i < 1; i++)
;
}
}
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