Closed GoogleCodeExporter closed 9 years ago
I was able to get a back trace in gdb
Thread debugging using libthread_db enabled]
Program received signal SIGSEGV, Segmentation fault.
0xb7a29146 in DataBuffer::DetachValue (this=0xbfffe2ac)
at /home/marc/mkleehammer-pyodbc-ca15ffb/src/getdata.cpp:195
195 if (PyString_CheckExact(bufferOwner))
(gdb) bt
#0 0xb7a29146 in DataBuffer::DetachValue (this=0xbfffe2ac)
at /home/marc/mkleehammer-pyodbc-ca15ffb/src/getdata.cpp:195
#1 0xb7a27e3d in GetDataString (cur=0x852fd48, iCol=0)
at /home/marc/mkleehammer-pyodbc-ca15ffb/src/getdata.cpp:344
#2 0xb7a28bf5 in GetData (cur=0x852fd48, iCol=0)
at /home/marc/mkleehammer-pyodbc-ca15ffb/src/getdata.cpp:624
#3 0xb7a1fbb4 in Cursor_fetch (cur=0x852fd48)
at /home/marc/mkleehammer-pyodbc-ca15ffb/src/cursor.cpp:997
#4 0xb7a1fc61 in Cursor_fetchlist (cur=0x852fd48, max=-1)
at /home/marc/mkleehammer-pyodbc-ca15ffb/src/cursor.cpp:1029
#5 0xb7a1ff12 in Cursor_fetchall (self=<pyodbc.Cursor at remote 0x852fd48>,
args=0x0) at /home/marc/mkleehammer-pyodbc-ca15ffb/src/cursor.cpp:1109
#6 0x081032b0 in call_function (pp_stack=0xbfffe8c8, oparg=0)
at ../Python/ceval.c:3997
#7 0x080fec38 in PyEval_EvalFrameEx (f=
Frame 0x846e77c, for file ../nvarchar_test.py, line 10, in <module> (),
throwflag=0) at ../Python/ceval.c:2666
....
Please let me know if you need any more details
Original comment by marc.del...@gmail.com
on 13 Jul 2011 at 3:12
Poking around in gdb confirmed my suspicion that bufferOwner was null when
PyString_CheckExact was being called. The attached diff simply adds guards to
protect a null from being passed to the various calls to CheckExact variants.
I am not sure that this is logically correct as I did not delve into the
workings of getdata but change does fix this issue and allows the test above to
succeed.
Original comment by marc.del...@gmail.com
on 13 Jul 2011 at 4:05
Attachments:
Fixed in 2.1.9-beta17.
Thank you for tracking down the root cause! That was an enormous help.
Original comment by mkleehammer
on 16 Jul 2011 at 9:01
Original issue reported on code.google.com by
marc.del...@gmail.com
on 13 Jul 2011 at 2:27