Re: Segmentation fault in Python 3 - Cursor - chained exceptions

Hi Anthony,
   does it require a new binary for Oracle 12c? The existing one should 
work with 12c client also, right? Unless you are adding some 12c 
specific features...

thanks,
krishna

On 5/14/2014 7:45 PM, Anthony Tuininga wrote:
> I am hoping this weekend to make a new release. It has been far too 
> long! I need binaries for Python 3.4 and Oracle 12c at the least. :-)
>
>
> On Wed, May 14, 2014 at 6:28 AM, Boris Dzuba <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     Thank you for the quick response. Do you already have any plans,
>     when will new version be released ?
>
>
>     2014-05-13 23:17 GMT+02:00 Anthony Tuininga
>     <[email protected] <mailto:[email protected]>>:
>
>         Thanks for the simple program to demonstrate the problem. :-)
>         I have just pushed a change to the source that resolves this
>         issue. Apparently in Python 3 the first time the exception is
>         referenced it is not normalized and so the error object I am
>         creating is immediately accessible. The second level of
>         exception results in a normalized exception which means that
>         it can't be accessed in the same way. Fortunately the
>         normalization can be forced so that I can access the error
>         object the same way each time. A subtle and rare bug so I
>         appreciate the pointer!
>
>         Anthony
>
>
>         On Tue, May 13, 2014 at 1:15 AM, Boris Dzuba
>         <[email protected] <mailto:[email protected]>> wrote:
>
>             Hi all,
>
>             The following test program gives a segmentation fault:
>
>             C:\>python
>             Python 3.3.3 (v3.3.3:c3896275c0f6, Nov 18 2013, 21:19:30)
>             [MSC v.1600 64 bit (AMD64)] on win32
>             Type "help", "copyright", "credits" or "license" for more
>             information.
>             >>> import cx_Oracle
>             >>> c=cx_Oracle.connect(<connect string>).cursor()
>             >>> try:
>             ...     c.execute("select")
>             ... except:
>             ...     try:
>             ...             c.execute("select")
>             ...     except:
>             ...             pass
>             ...
>
>             C:\>
>
>             Access Violation
>             Faulting application name: python.exe
>             Fault offset: 0x000000000000cacd
>
>
>             Platform: 64bit, Win7, Oracle Client 11g (11.2.0.1.0),
>             python 3.3.3, cx_Oracle 5.1.2
>
>
>
>             At a guess, the problem is because in the function
>             Cursor_SetErrorOffset() /Cursor.c/:
>
>             static void Cursor_SetErrorOffset(
>                 udt_Cursor *self) // cursor to get the error offset from
>             {
>                 PyObject *type, *value, *traceback;
>                 udt_Error *error;
>
>                 PyErr_Fetch(&type, &value, &traceback);
>                 if (type == g_DatabaseErrorException) {
>                     error = (udt_Error*) value;
>                     OCIAttrGet(self->handle, OCI_HTYPE_STMT,
>             &error->offset, 0,
>             OCI_ATTR_PARSE_ERROR_OFFSET, self->environment->errorHandle);
>                 }
>                 PyErr_Restore(type, value, traceback);
>             }
>             OCIAttrGet() call attempts to write a value to the address
>             /&error->offset/,
>             therefore after the end of an allocated memory block of
>             the borrowed pointer /PyObject *value/
>
>             typedef struct {
>                 PyObject_HEAD
>                 sb4 code;
>                 ub4 offset;
>                 PyObject *message;
>                 const char *context;
>             } udt_Error;
>
>
>             Commenting it out /* OCIAttrGet(self->handle,
>             OCI_HTYPE_STMT, &error->offset, 0,
>             OCI_ATTR_PARSE_ERROR_OFFSET,
>             self->environment->errorHandle);*/
>             fix this crash!
>
>
>             Regards,
>             Boris
>
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