Hi,
more investigation (single-stepping in gdb) lead to the discovery that
the abrt comes from this line:
(gdb)
test-replicas: Objects/frameobject.c:633: PyFrame_New: Assertion
`f->f_code == code' failed.
.EE.
Program received signal SIGABRT, Aborted.
The complete stacktrace is this:
(gdb) bt
#0 0x0000003a3a2328a5 in raise () from /lib64/libc.so.6
#1 0x0000003a3a234085 in abort () from /lib64/libc.so.6
#2 0x0000003a3a22ba1e in __assert_fail_base () from /lib64/libc.so.6
#3 0x0000003a3a22bae0 in __assert_fail () from /lib64/libc.so.6
#4 0x0000003a4c26deeb in PyFrame_New () from /usr/lib64/libpython2.6.so.1.0
#5 0x0000003a4c2dfee9 in PyEval_EvalCodeEx () from
/usr/lib64/libpython2.6.so.1.0
#6 0x0000003a4c26edb0 in ?? () from /usr/lib64/libpython2.6.so.1.0
#7 0x0000003a4c244303 in PyObject_Call () from
/usr/lib64/libpython2.6.so.1.0
#8 0x0000003a4c25970f in ?? () from /usr/lib64/libpython2.6.so.1.0
#9 0x0000003a4c244303 in PyObject_Call () from
/usr/lib64/libpython2.6.so.1.0
#10 0x0000003a4c2d8dd3 in PyEval_CallObjectWithKeywords () from
/usr/lib64/libpython2.6.so.1.0
#11 0x0000003a4c2f835a in PyEval_CallFunction () from
/usr/lib64/libpython2.6.so.1.0
#12 0x00007ffff79529e6 in
boost::python::call<boost::python::api::object, unsigned long,
std::basic_string<char, std::char_traits<char>, std::allocator<char>
> > (callable=0x7ffff78f0fa0, a0=<value optimized out>, a1=<value
optimized out>) at /usr/include/boost/python/call.hpp:66
#13 0x00007ffff795000e in operator()<ino_t, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > > (this=<value optimized
out>, parent=0,
name="/") at /usr/include/boost/python/object_call.hpp:19
#14 dmlite::PythonINode::extendedStat (this=<value optimized out>,
parent=0, name="/")
at
/usr/src/debug/dmlite-0.6.0/python/embedding/src/cpp/PythonINode.cpp:171
#15 0x0000003ab0a63a09 in dmlite::BuiltInCatalog::extendedStat
(this=0x724640, path=<value optimized out>, followSym=true)
at /usr/src/debug/dmlite-0.6.0/src/core/builtin/Catalog.cpp:149
#16 0x0000003ab0a60d64 in dmlite::BuiltInCatalog::changeDir
(this=0x724640, path="/") at
/usr/src/debug/dmlite-0.6.0/src/core/builtin/Catalog.cpp:116
#17 0x0000000000406b4b in TestReplicas::setUp (this=0x620540) at
/usr/src/debug/dmlite-0.6.0/tests/cpp/test-replicas.cpp:16
#18 0x0000003a3ce24d3a in CppUnit::TestCaseMethodFunctor::operator()()
const () from /usr/lib64/libcppunit-1.12.so.1
#19 0x0000003a3ce1a064 in
CppUnit::DefaultProtector::protect(CppUnit::Functor const&,
CppUnit::ProtectorContext const&) ()
from /usr/lib64/libcppunit-1.12.so.1
#20 0x0000003a3ce21647 in
CppUnit::ProtectorChain::protect(CppUnit::Functor const&,
CppUnit::ProtectorContext const&) ()
from /usr/lib64/libcppunit-1.12.so.1
#21 0x0000003a3ce2a834 in CppUnit::TestResult::protect(CppUnit::Functor
const&, CppUnit::Test*, std::basic_string<char, std::char_traits<char>,
std::allocato
r<char> > const&) () from /usr/lib64/libcppunit-1.12.so.1
#22 0x0000003a3ce24989 in CppUnit::TestCase::run(CppUnit::TestResult*)
() from /usr/lib64/libcppunit-1.12.so.1
#23 0x0000003a3ce250c3 in
CppUnit::TestComposite::doRunChildTests(CppUnit::TestResult*) () from
/usr/lib64/libcppunit-1.12.so.1
#24 0x0000003a3ce24fe6 in
CppUnit::TestComposite::run(CppUnit::TestResult*) () from
/usr/lib64/libcppunit-1.12.so.1
#25 0x0000003a3ce250c3 in
CppUnit::TestComposite::doRunChildTests(CppUnit::TestResult*) () from
/usr/lib64/libcppunit-1.12.so.1
#26 0x0000003a3ce24fe6 in
CppUnit::TestComposite::run(CppUnit::TestResult*) () from
/usr/lib64/libcppunit-1.12.so.1
#27 0x0000003a3ce2a5da in CppUnit::TestResult::runTest(CppUnit::Test*)
() from /usr/lib64/libcppunit-1.12.so.1
#28 0x0000003a3ce2c553 in CppUnit::TestRunner::run(CppUnit::TestResult&,
std::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&) ()
from /usr/lib64/libcppunit-1.12.so.1
#29 0x0000003a3ce2ea2b in
CppUnit::TextTestRunner::run(std::basic_string<char,
std::char_traits<char>, std::allocator<char> >, bool, bool, bool) ()
from /usr/lib64/libcppunit-1.12.so.1
#30 0x000000000040ef84 in testBaseMain (argn=<value optimized out>,
argv=<value optimized out>) at
/usr/src/debug/dmlite-0.6.0/tests/cpp/test-base.cpp:92
#31 0x0000003a3a21ecdd in __libc_start_main () from /lib64/libc.so.6
#32 0x00000000004063c9 in _start ()
On 11/23/2012 08:36 PM, Martin Hellmich wrote:
Hi,
in my exception handling (based on a tutorial, which I can dig up if it
helps), I create handles for the exc, val, tb values of an exception
thrown in python.
The code is shown below in extractException(). It is a shortened
version, which does not cover all possible cases.
In some cases, val is defined, but tb is not. When then htb points to
0x0, the function fails with a SIGABRT as it returns.
I believe that the free() for the htb fails, when it goes out of scope
at the end of the function.
I put the Error message and the GDB output at the end of the mail.
The address at which the free() fails is likely the one of tb, as it
sits inbetween exc and val in memory.
Other calls to extractException() where tb is not null do not abort.
Do you have an idea why the free() could fail?
I am happy to post more information, if needed and would welcome any
hints :)
Cheers
Martin
void PythonExceptionHandler::extractException() throw (DmException)
{
using namespace boost::python;
PyObject *exc,*val,*tb;
PyErr_Fetch(&exc,&val,&tb);
PyErr_NormalizeException(&exc,&val,&tb);
handle<> hexc(exc),hval(allow_null(val)),htb(allow_null(tb));
int code = 0;
std::string what = "";
if (PyObject_HasAttrString(val, "code") &&
PyObject_HasAttrString(val, "what")) {
object oval(hval);
extract<int> get_code(oval.attr("code")());
extract<std::string> get_what(oval.attr("what")());
code = get_code();
what = get_what();
throw DmException(code, what);
} else {
std::string excString;
excString = extract<std::string>(str(hexc));
throw DmException(DMLITE_SYSERR(DMLITE_UNKNOWN_ERROR),
excString);
}
}
Error Message:
*** glibc detected *** /usr/lib64/dmlite/test/cpp/test-replicas: free():
invalid pointer: 0x0000003a4c5a0d60 ***
GDB output:
(gdb) p htb
$6 = {m_p = 0x0}
(gdb) p tb
$7 = (PyObject *) 0x0
(gdb) info locals
val = 0x3a4c5a0d80
tb = 0x0
hexc = {m_p = 0x3a4c579ea0}
what = ""
exc = 0x3a4c579ea0
hval = {m_p = 0x3a4c5a0d80}
htb = {m_p = 0x0}
code = <value optimized out>
--
Martin Hellmich Information Technology Department
mhell...@cern.ch CERN
+41 22 76 765 26 CH-1211 Geneva 23
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