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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Peter Eisentraut <peter@eisentraut.org>
cc: pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Prepare for Python "Limited API" in PL/Python
In-reply-to: <E1tnJNu-000CZW-0X@gemulon.postgresql.org>
References: <E1tnJNu-000CZW-0X@gemulon.postgresql.org>
Comments: In-reply-to Peter Eisentraut <peter@eisentraut.org>
	message dated "Wed, 26 Feb 2025 15:31:43 +0000"
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Date: Wed, 26 Feb 2025 11:51:04 -0500
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Peter Eisentraut <peter@eisentraut.org> writes:
> Prepare for Python "Limited API" in PL/Python

Buildfarm's not happy with this at all.  It fails here too,
with python 3.6.8:

Program terminated with signal SIGSEGV, Segmentation fault.
#0  PyDict_GetItem (op=3D<unknown at remote 0x1>, key=3D'enter')
    at /usr/src/debug/python3-3.6.8-69.el8_10.x86_64/Objects/dictobject.c:=
1411
1411        if (!PyDict_Check(op))
(gdb) bt
#0  PyDict_GetItem (op=3D<unknown at remote 0x1>, key=3D'enter') at /usr/s=
rc/debug/python3-3.6.8-69.el8_10.x86_64/Objects/dictobject.c:1411
#1  0x00007fd48af71196 in _PyType_Lookup (name=3D'enter', type=3D0x2236858=
) at /usr/src/debug/python3-3.6.8-69.el8_10.x86_64/Objects/typeobject.c:29=
66
#2  _PyType_Lookup (name=3D'enter', type=3D0x2236858) at /usr/src/debug/py=
thon3-3.6.8-69.el8_10.x86_64/Objects/typeobject.c:2913
#3  _PyObject_GenericGetAttrWithDict (dict=3D0x0, name=3D'enter', obj=3D<o=
ptimized out>) at /usr/src/debug/python3-3.6.8-69.el8_10.x86_64/Objects/ob=
ject.c:1090
#4  PyObject_GenericGetAttr (name=3D'enter', obj=3D<optimized out>) at /us=
r/src/debug/python3-3.6.8-69.el8_10.x86_64/Objects/object.c:1158
#5  PyObject_GetAttr (v=3D<optimized out>, name=3D'enter') at /usr/src/deb=
ug/python3-3.6.8-69.el8_10.x86_64/Objects/object.c:928
#6  0x00007fd48afc52f2 in _PyEval_EvalFrameDefault (f=3D<optimized out>, t=
hrowflag=3D<optimized out>) at /usr/src/debug/python3-3.6.8-69.el8_10.x86_=
64/Python/ceval.c:2873
#7  0x00007fd48afa1108 in PyEval_EvalFrameEx (throwflag=3D0, f=3DFrame 0x7=
fd48a5d6588, for file <string>, line 4, in __plpython_procedure_subtransac=
tion_alternative_names_49201 (s=3D<PLySubtransaction at remote 0x7fd497f32=
1c8>))
    at /usr/src/debug/python3-3.6.8-69.el8_10.x86_64/Python/ceval.c:752
#8  _PyFunction_FastCall (globals=3D<optimized out>, nargs=3D<optimized ou=
t>, args=3D<optimized out>, co=3D<optimized out>) at /usr/src/debug/python=
3-3.6.8-69.el8_10.x86_64/Python/ceval.c:4934
#9  fast_function (func=3D<optimized out>, stack=3D<optimized out>, nargs=3D=
<optimized out>, kwnames=3D<optimized out>) at /usr/src/debug/python3-3.6.=
8-69.el8_10.x86_64/Python/ceval.c:4969
#10 0x00007fd48afc4537 in call_function (pp_stack=3D0x7ffe3d639da8, oparg=3D=
<optimized out>, kwnames=3D0x0) at /usr/src/debug/python3-3.6.8-69.el8_10.=
x86_64/Python/ceval.c:4873
#11 0x00007fd48afc5198 in _PyEval_EvalFrameDefault (f=3D<optimized out>, t=
hrowflag=3D<optimized out>) at /usr/src/debug/python3-3.6.8-69.el8_10.x86_=
64/Python/ceval.c:3336
#12 0x00007fd48af210a4 in PyEval_EvalFrameEx (throwflag=3D0, f=3DFrame 0x7=
fd48a5b0048, for file <string>, line 1, in <module> ()) at /usr/src/debug/=
python3-3.6.8-69.el8_10.x86_64/Python/ceval.c:4167
#13 _PyEval_EvalCodeWithName (_co=3D<optimized out>, globals=3D<optimized =
out>, locals=3D<optimized out>, args=3D<optimized out>, argcount=3D<optimi=
zed out>, kwnames=3D<optimized out>, kwargs=3D<optimized out>, kwcount=3D<=
optimized out>, =

    kwstep=3D<optimized out>, defs=3D<optimized out>, defcount=3D<optimize=
d out>, kwdefs=3D<optimized out>, closure=3D<optimized out>, name=3D<optim=
ized out>, qualname=3D<optimized out>) at /usr/src/debug/python3-3.6.8-69.=
el8_10.x86_64/Python/ceval.c:4167
#14 0x00007fd48af22463 in PyEval_EvalCodeEx (closure=3D0x0, kwdefs=3D0x0, =
defcount=3D0, defs=3D0x0, kwcount=3D0, kws=3D0x0, argcount=3D0, args=3D0x0=
, locals=3D<optimized out>, globals=3D<optimized out>, _co=3D<optimized ou=
t>)
    at /usr/src/debug/python3-3.6.8-69.el8_10.x86_64/Python/ceval.c:4188
#15 PyEval_EvalCode (co=3D<optimized out>, globals=3D<optimized out>, loca=
ls=3D<optimized out>) at /usr/src/debug/python3-3.6.8-69.el8_10.x86_64/Pyt=
hon/ceval.c:732
#16 0x00007fd48b3773d7 in PLy_procedure_call (kargs=3Dkargs@entry=3D0x7fd4=
8b37eeda "args", vargs=3D<optimized out>, proc=3D<optimized out>, proc=3D<=
optimized out>) at plpy_exec.c:1069
#17 0x00007fd48b377816 in PLy_exec_function (fcinfo=3Dfcinfo@entry=3D0x226=
f948, proc=3D0x2269130) at plpy_exec.c:102
#18 0x00007fd48b3782c8 in plpython3_call_handler (fcinfo=3D0x226f948) at p=
lpy_main.c:244
#19 0x00000000006eec15 in ExecInterpExpr (state=3D0x226f7f0, econtext=3D0x=
226f498, isnull=3D<optimized out>) at execExprInterp.c:912
#20 0x0000000000727e80 in ExecEvalExprSwitchContext (isNull=3D0x7ffe3d63a3=
df, econtext=3D0x226f498, state=3D0x226f7f0) at ../../../src/include/execu=
tor/executor.h:397
#21 ExecProject (projInfo=3D0x226f7e8) at ../../../src/include/executor/ex=
ecutor.h:431
#22 ExecResult (pstate=3D<optimized out>) at nodeResult.c:135


			regards, tom lane