How to debug "into" oci?

Hi,

I've been able to port a small part of your library to Go, but now I
face with a SIGSEGV using cursor variable.
Of course the signal is thrown in OCIStmtExecute, but I think the
error is with the binds before.

~/p/g/s/g/t/goracle ❯❯❯ ./oracle.test -test.run=TestCursorOut
-dsn=tgulacsi/tgulacsi@xe
2013/05/25 19:32:38 set position 0(0) in dataBytes to cbdae9f801040000
2013/05/25 19:32:38 CTRACE OCIStmtPrepare2([
0x7f454407d498
0xc2000852a0 0x7f454407d578 DECLARE\n  v_cur SYS_REFCURSOR;\nBEGIN\n
OPEN v_cur FOR\n    SELECT * FROM all_objects;\n  :1 := v_cur;\nEND;
104 [7 162 123 111 183 232 2 162] 8 NTV_SYNTAX DEFAULT])
2013/05/25 19:32:38 CTRACE OCIAttrGet([0x7f4544096dd0 HTYPE_STMT
0xc2000001f0 0xc2000001f8 ATTR_STMT_TYPE 0x7f454407d578])
2013/05/25 19:32:38 CTRACE OCIBindByPos([0x7f4544096dd0 0xc200076120
0x7f454407d578 pos=1 dataArr: 0xc2000001a8 bufsize: 8 typ: 116 [0]
<nil> <nil> 0 <nil> DEFAULT])
2013/05/25 19:32:38 CTRACE OCIStmtExecute([0x7f454407d498
0x7f4544096dd0 0x7f454407d578 1 0 <nil> <nil> 0])
SIGSEGV: segmentation violation
PC=0x7f455d25724d
signal arrived during cgo execution

github.com/tgulacsi/goracle/oracle._Cfunc_OCIStmtExecute(0x7f454407d498,
0x7f4544096dd0, 0x7f454407d578, 0x1, 0x0, ...)
    github.com/tgulacsi/goracle/oracle/_test/_cgo_defun.c:518 +0x34
github.com/tgulacsi/goracle/oracle.(*Cursor).internalExecute(0xc2000852a0,
0x1, 0x0, 0x1)
    github.com/tgulacsi/goracle/oracle/_test/_cgo_gotypes.go:1089 +0x2f7
github.com/tgulacsi/goracle/oracle.(*Cursor).Execute(0xc2000852a0,
0x58f530, 0x68, 0x7f455dbf6de8, 0x1, ...)
    github.com/tgulacsi/goracle/oracle/_test/_cgo_gotypes.go:2070 +0x19d
github.com/tgulacsi/goracle/oracle.TestCursorOut(0xc200090000)
    /home/gthomas/projects/go/src/github.com/tgulacsi/goracle/oracle/datatypes_test.go:388
+0x2cd
testing.tRunner(0xc200090000, 0x63c770)
    /usr/local/go/src/pkg/testing/testing.go:353 +0x8a
created by testing.RunTests
    /usr/local/go/src/pkg/testing/testing.go:433 +0x86b

goroutine 1 [chan receive]:
testing.RunTests(0x58d348, 0x63c680, 0xb, 0xb, 0x1, ...)
    /usr/local/go/src/pkg/testing/testing.go:434 +0x88e
testing.Main(0x58d348, 0x63c680, 0xb, 0xb, 0x64b4e0, ...)
    /usr/local/go/src/pkg/testing/testing.go:365 +0x8a
main.main()
    github.com/tgulacsi/goracle/oracle/_test/_testmain.go:63 +0x9a


What do you suggest, how can I debug this? What shall I check?
I can't debug into oracle library...
Should I try to instrument a cx_Oracle module (stuff printf
everywhere) and make a small working test to have something to compare
to?
Seems to be a lot of work.

Better ideas?

Thanks in advance,
Tamás Gulácsi

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