https://llvm.org/bugs/show_bug.cgi?id=26971
Bug ID: 26971
Summary: crash at -O3 in 32-bit mode on x86_64-linux-gnu
(Segmentation fault,
llvm::Instruction::eraseFromParent())
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: chengnian...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following code crashes the trunk at -O3 in 32-bit mode on
x86_64-linux-gnu.
$: clang-trunk -v
clang version 3.9.0 (trunk 263641)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
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/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$:
$:
$:
$: clang-trunk -c -w small.c -m32 -O3
0 clang-3.9 0x0000000001abe055
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1 clang-3.9 0x0000000001abbe06 llvm::sys::RunSignalHandlers() + 54
2 clang-3.9 0x0000000001abc031
3 libpthread.so.0 0x00007f31a8012340
4 clang-3.9 0x000000000174b156 llvm::Instruction::eraseFromParent() + 22
5 clang-3.9 0x0000000001afeefa
llvm::RecursivelyDeleteTriviallyDeadInstructions(llvm::Value*,
llvm::TargetLibraryInfo const*) + 538
6 clang-3.9 0x00000000019920ff
7 clang-3.9 0x00000000019940a6
8 clang-3.9 0x0000000001998133
9 clang-3.9 0x0000000002289287
llvm::LPPassManager::runOnFunction(llvm::Function&) + 1431
10 clang-3.9 0x0000000001777ab3
llvm::FPPassManager::runOnFunction(llvm::Function&) + 643
11 clang-3.9 0x000000000226b680
12 clang-3.9 0x000000000177817f
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 751
13 clang-3.9 0x0000000001be80a8
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::DataLayout const&, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*) + 3144
14 clang-3.9 0x00000000021726ec
15 clang-3.9 0x000000000248b1eb clang::ParseAST(clang::Sema&, bool, bool)
+ 571
16 clang-3.9 0x000000000217287e clang::CodeGenAction::ExecuteAction() +
78
17 clang-3.9 0x0000000001ec5696 clang::FrontendAction::Execute() + 534
18 clang-3.9 0x0000000001ea1f5e
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 318
19 clang-3.9 0x0000000001f4948c
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2300
20 clang-3.9 0x00000000009e2a98 cc1_main(llvm::ArrayRef<char const*>,
char const*, void*) + 2344
21 clang-3.9 0x000000000099e895 main + 6213
22 libc.so.6 0x00007f31a721bec5 __libc_start_main + 245
23 clang-3.9 0x00000000009dea44
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-3.9 -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
-momit-leaf-frame-pointer -dwarf-column-info -debugger-tuning=gdb
-coverage-file /home/cnsun/temp/clang-m32/small.c -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.9.0 -c-isystem . -c-isystem
/usr/local/include/csmith-2.2.0/ -internal-isystem /usr/local/include
-internal-isystem /usr/local/clang-trunk/bin/../lib/clang/3.9.0/include
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O3
-w -fdebug-compilation-dir /home/cnsun/temp/clang-m32 -ferror-limit 19
-fmessage-length 126 -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 '@write_frequencies_j'
5. Running pass 'Recognize loop idioms' on basic block '%if.then'
clang-3.9: error: unable to execute command: Segmentation fault (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 263641)
Target: i386-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-3.9: 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-3.9: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /home/cnsun/ramdisk/tmp/small-5f188f.c
clang-3.9: note: diagnostic msg: /home/cnsun/ramdisk/tmp/small-5f188f.sh
clang-3.9: note: diagnostic msg:
********************
$:
$:
$: clang-trunk -c -w small.c -m64 -O3
$: clang-trunk -c -w small.c -m32 -O1
$:
$: cat small.c
typedef struct {
char *string;
int num;
} sorter;
long a;
void write_frequencies_j() {
long b = 0;
sorter *s;
sorter c;
s = calloc(0, sizeof(sorter));
for (; b < a; b++)
if (s) {
memcpy(&c, &s[b], sizeof(sorter));
memcpy(write_frequencies_j, &s, sizeof(sorter));
memcpy(&s[b], &c, sizeof(sorter));
}
}
$:
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