[LLVMbugs] [Bug 17347] New: clang segfaults at -O1 and above on x86_64-pc-linux-gnu
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Tue Sep 24 13:37:47 PDT 2013
http://llvm.org/bugs/show_bug.cgi?id=17347
Bug ID: 17347
Summary: clang segfaults at -O1 and above on
x86_64-pc-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangbugs at nondot.org
Reporter: su at cs.ucdavis.edu
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
The current clang trunk and clang 3.3 segfault when compiling the following
testcase at -O1 and above (in both 32-bit and 64-bit modes) on
x86_64-pc-linux-gnu.
This is a regression from clang 3.2.
$ clang-trunk -v
clang version 3.4 (trunk 191280)
Target: x86_64-pc-linux-gnu
Thread model: posix
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/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
$ clang-trunk -O0 -c small.c
$ clang-3.3 -O0 -c small.c
$ clang-3.2 -O1 -c small.c
$ clang-trunk -O1 -c small.c
0 clang 0x0000000001c54935 llvm::sys::PrintStackTrace(_IO_FILE*) +
37
1 clang 0x0000000001c54d83
2 libpthread.so.0 0x00007fd82d1c3cb0
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang -cc1 -triple
x86_64-pc-linux-gnu -emit-obj -disable-free -disable-llvm-verifier
-main-file-name small.c -mrelocation-model static -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version
2.22 -momit-leaf-frame-pointer -coverage-file
/data2/c-hunter-results/C/trans-bugs/20130924-clang-m32-m64-O1-O2-O3-Os-build-test145983/small.o
-resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.4 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.4/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/20130924-clang-m32-m64-O1-O2-O3-Os-build-test145983
-ferror-limit 19 -fmessage-length 122 -mstackrealign -fobjc-runtime=gcc
-fobjc-default-synthesize-properties -fdiagnostics-show-option
-fcolor-diagnostics -vectorize-slp -o small.o -x c small.c
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'Global Variable Optimizer' on module 'small.c'.
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.4 (trunk 191280)
Target: x86_64-pc-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-1cdc61.c
clang: note: diagnostic msg: /tmp/small-1cdc61.sh
clang: note: diagnostic msg:
********************
$ clang-3.3 -O1 -c small.c
0 clang 0x0000000001a9d545 llvm::sys::PrintStackTrace(_IO_FILE*) +
37
1 clang 0x0000000001a9d923
2 libpthread.so.0 0x00007feafabf6cb0
Stack dump:
0. Program arguments: /usr/local/clang-3.3/bin/clang -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -disable-free -disable-llvm-verifier
-main-file-name small.c -mrelocation-model static -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version
2.22 -momit-leaf-frame-pointer -coverage-file
/data2/c-hunter-results/C/trans-bugs/20130924-clang-m32-m64-O1-O2-O3-Os-build-test145983/small.o
-resource-dir /usr/local/clang-3.3/bin/../lib/clang/3.3 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-3.3/bin/../lib/clang/3.3/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/20130924-clang-m32-m64-O1-O2-O3-Os-build-test145983
-ferror-limit 19 -fmessage-length 122 -mstackrealign -fobjc-runtime=gcc
-fobjc-default-synthesize-properties -fdiagnostics-show-option
-fcolor-diagnostics -backend-option -vectorize-loops -o small.o -x c small.c
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'Global Variable Optimizer' on module 'small.c'.
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.3 (tags/RELEASE_33/final)
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-nxA2op.c
clang: note: diagnostic msg: /tmp/small-nxA2op.sh
clang: note: diagnostic msg:
********************
$
---------------------------------
struct S
{
char f0;
char f1;
};
static struct S a;
static char *b[8] = { 0, 0, 0, 0, 0, 0, &a.f0, &a.f1 };
static char **c = &b[6];
char foo ()
{
return **c;
}
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