Re: [cx-oracle-users] Segmentation fault in Python 3 - Cursor - chained exceptions
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Re: [cx-oracle-users] Segmentation fault in Python 3 - Cursor - chained exceptions
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From: Krishna M. IV <kri...@or...> - 2014-05-15 12:13:30
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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 <bor...@gm...
> <mailto:bor...@gm...>> 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
> <ant...@gm... <mailto:ant...@gm...>>:
>
> 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
> <bor...@gm... <mailto:bor...@gm...>> 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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