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Date: Fri, 5 Mar 2021 15:42:49 +0100
To: Mark Geisert <mark AT maxrnd DOT com>
Subject: Re: segfault on 32bit cygwin snapshot
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>, cygwin AT cygwin DOT com
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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"!


Corinna
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