STINNER Victor added the comment:
> I encounter a quite similar issue with python 3.4.0 and cx_Oracle.
Your issue is different, compare the top frames:
My trace:
#0 0x0000003f3a835c59 in raise () from /lib64/libc.so.6
#1 0x0000003f3a837368 in abort () from /lib64/libc.so.6
#2 0x0000003f3a82ebb6 in __assert_fail_base () from /lib64/libc.so.6
#3 0x0000003f3a82ec62 in __assert_fail () from /lib64/libc.so.6
#4 0x000000000043ac66 in visit_decref (
op=Frame 0x7f013c001398, for file x.py, line 43 (...) at
Modules/gcmodule.c:379
#5 0x00000000004336bd in tb_traverse (tb=0x7f01493a66e8, visit=0x43abb4
<visit_decref>, arg=0x0) at Python/traceback.c:64
#6 0x000000000043acdc in subtract_refs (containers=0x8f1a20 <generations+64>)
at Modules/gcmodule.c:398
cx_Oracle trace:
#0 0x000000000043ab98 in visit_decref (op=0xb00000000, data=0x0) at
Modules/gcmodule.c:373
#1 0x000000000048193a in BaseException_traverse (self=0x7ffff0f645f8,
visit=0x43ab64 <visit_decref>, arg=0x0) at Objects/exceptions.c:97
#2 0x00000000004dc4cc in subtype_traverse (self=0x7ffff0f645f8, visit=0x43ab64
<visit_decref>, arg=0x0) at Objects/typeobject.c:972
In my trace, visit_decref() is called on a frame and fail with an assertion
error.
In cx_Oracle trace, visit_decref() is called on a NULL pointer which comes from
an Exception.
In my experience, it's a bug in cx_Oracle. If you think that I'm wrong and that
it's a bug in Python, please open a *new* issue since the trace is different.
--
For your cx_Oracle, issue:
#1 0x000000000048193a in BaseException_traverse (self=0x7ffff0f645f8,
visit=0x43ab64 <visit_decref>, arg=0x0) at Objects/exceptions.c:97
Can you go this frame (in gdb, type "frame 1") and dump the Exception object:
(gdb) print _PyObject_Dump(0x000000000048193a)
Note for myself: I should write a documentation explaining how to debug Python
in gdb.
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