From: Mark Geisert <mark@maxrnd.com>
To: cygwin@cygwin.com
Subject: Re: segfault on 32bit cygwin snapshot
Date: Mon, 8 Mar 2021 03:07:38 -0800 [thread overview]
Message-ID: <7b34da67-7550-765b-3731-31b51b2a5df9@maxrnd.com> (raw)
In-Reply-To: <Pine.BSF.4.63.2103051447400.41714@m0.truegem.net>
Following up to myself...
Mark Geisert wrote:
> Hi Corinna,
>
> On Fri, 5 Mar 2021, Corinna Vinschen wrote:
>> On Mar 5 01:11, Mark Geisert wrote:
>>> Marco Atzeri via Cygwin wrote:
>>>> On 04.03.2021 21:17, Marco Atzeri wrote:
>>>>> On 04.03.2021 16:17, Ken Brown via Cygwin wrote:
>>>>>> On 3/4/2021 6:50 AM, Takashi Yano via Cygwin wrote:
>>>>>>> On Thu, 4 Mar 2021 12:11:11 +0100
>>>>>>> marco atzeri wrote:
>>>>>>>> I have no problem to patch Python to solve the issue,
>>>>>>>> but I have not seen evidence of the dlsym mechanism .
>>>>>>>> But of course I an NOT and expert in this field.
>>>>>>>>
>>>>>>>> If someone looking to the code can give me some hints,
>>>>>>>> I will appreciate
>>>>>>>
>>>>>>> I am also not sure where the dlsym() is used in python.
>>>>>>> At least, os.uname() works in python 3.8.7 and 2.7.18 in my
>>>>>>> environment even without that snippet. It seems that os.uname()
>>>>>>> does not use dlsym(). Do I overlook something?
>>>>>>
>>>>>> This all started because Mark reported a problem building python 3.8.3:
>>>>>>
>>>>>> https://cygwin.com/pipermail/cygwin-apps/2020-December/040765.html
>>>>>> https://cygwin.com/pipermail/cygwin-developers/2020-December/012019.html
>>>>>>
>>>>>> It's strange that Marco never bumped into the problem.
>>>>>>
>>>>>> Ken
>>>>>
>>>>> I never built python using cygwin snapshots as Mark was trying to do,
>>>>> all my builds were using 3.1.7.
>>>>>
>>>>> Let me set a separate enviroment for building on latest snapshot
>>>>
>>>> I can not replicate with latest snapshot
>>>>
>>>> $ uname -svr
>>>> CYGWIN_NT-10.0-WOW 3.2.0s(0.340/5/3) 2021-03-01 15:42
>>>>
>>>> nor in 64bit when building 3.8.8
>>>>
>>>> For what I see the DLL is always using a proper import
>>>> from cygwin1.dll
>>>>
>>>> $ objdump -x libpython3.8.dll |grep uname
>>>> 2b9de0 2170 uname
>>>> 2b9de8 2171 uname_x
>>>>
>>>> the only thing not standard on my build system is a case sensitive
>>>> filesystem and mount
>>>
>>> I had concerns that I had somehow corrupted my build environment, and it was
>>> Marco's successes that convinced me to reinstall 3.1.7 to recover a
>>> known-good environment. Then seeing Marco go ahead and release the
>>> different Python releases (yay!) I didn't investigate any further.
>>>
>>> I'm now trying to locate the os.uname usage of dlopen/dlsym again just for
>>> the record but am having some difficulty. I'll reply again when I've got
>>> it.
>>
>> Guys,
>>
>> if it turns out that we fixed a problem that doesn't actually is a
>> real-world problem, I'm wondering if we shouldn't just revert the Cygwin
>> patch we're talking about here (commit 532b91d24e9496) and be done with
>> it.
>>
>> Special casing dynamic loading of uname just to support some experimental
>> bordercase doesn't make much sense. In that case I'm all for "don't do
>> that"!
>
> That may well be the appropriate endpoint, but please let me dig a little further
> into the recent Python versions. The fact that they had an explicit dlopen/dlsym
> to get at uname(), but now they don't, troubles me. I want to be sure us Cygwin
> folk aren't in an inadvertent "arms race" with the Python devs over the uname API
> change. Dunno why this didn't occur 15+ years ago, but here we are.
>
> I think it was in Python's Modules/posixmodule.c. They're certainly using uname()
> directly in their most recent builds. But I believe that wasn't always the case,
> even just a few months ago. Let me dig for a day or two.
Not to put too fine a point on it, but I now believe I hit the issue I reported
due to my own corrupted build environment. Marco and Ken have both built recent
Python packages on Cygwin 3.1.7 and proto-3.2.0 respectively, Ken having reverted
the commit you're talking about (not sure about Marco). Both had success.
I believe reverting that commit 532b91d24e9496 is the correct action to take.
..mark
next prev parent reply other threads:[~2021-03-08 11:07 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-20 21:01 Marco Atzeri
2021-02-20 22:29 ` Takashi Yano
2021-02-28 18:48 ` Marco Atzeri
2021-03-01 0:55 ` Takashi Yano
2021-03-01 8:41 ` Takashi Yano
2021-03-01 11:26 ` Takashi Yano
2021-03-01 12:17 ` marco atzeri
2021-03-01 12:25 ` Takashi Yano
2021-03-02 11:03 ` Takashi Yano
2021-03-02 15:48 ` Corinna Vinschen
2021-03-03 9:56 ` Takashi Yano
2021-03-03 11:00 ` Corinna Vinschen
2021-03-04 9:05 ` Mark Geisert
2021-03-04 16:11 ` Corinna Vinschen
2021-03-05 9:18 ` Mark Geisert
2021-03-05 14:37 ` Corinna Vinschen
2021-03-04 9:05 ` Takashi Yano
2021-03-04 11:11 ` marco atzeri
2021-03-04 11:50 ` Takashi Yano
2021-03-04 15:17 ` Ken Brown
2021-03-04 15:54 ` Corinna Vinschen
2021-03-04 20:17 ` Marco Atzeri
2021-03-05 8:09 ` Marco Atzeri
2021-03-05 9:11 ` Mark Geisert
2021-03-05 14:42 ` Corinna Vinschen
2021-03-05 16:30 ` Marco Atzeri
2021-03-06 1:45 ` Takashi Yano
2021-03-06 17:16 ` Ken Brown
2021-03-06 21:38 ` Mark Geisert
2021-03-05 22:55 ` Mark Geisert
2021-03-08 11:07 ` Mark Geisert [this message]
2021-03-08 14:01 ` Corinna Vinschen
2021-03-04 15:52 ` Corinna Vinschen
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