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X-HELO:	drew.franken.de
Date:	Tue, 20 Jun 2017 13:11:12 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: cygserver - Postgres Multiple connection Load Testing - Inifinte Loop
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On Jun 15 01:32, Marco Atzeri wrote:
> On 07/05/2017 05:47, Larry Hall (Cygwin) wrote:
> > On 05/06/2017 11:27 PM, Noah Misch wrote:
> > > On Sat, Apr 01, 2017 at 10:36:24PM -0400, Noah Misch wrote:
> > > > On Tue, Mar 28, 2017 at 01:26:52AM -0400, Noah Misch wrote:
> > > > > On Fri, Mar 24, 2017 at 06:11:01PM +0100, Corinna Vinschen wrote:
> > > > > > I pushed a patchset now, and uploaded new developer snapshots f=
or
> > > > > > testing to https://cygwin.com/snapshots/
> > > > >=20
> > > > > > Please give it a try
> > > >=20
> > > > > I call the cygwin-20170324 freezes "limited" because the symptoms
> > > > > differ from
> > > > > the classic freeze I described upthread.  "strace /bin/true" and =
"cat
> > > > > /proc/sysvipc/sem" do not hang, but every PostgreSQL backend proc=
ess
> > > > > is stuck
> > > > > waiting on a synchronization primitive.
> > > > >=20
> > > > > I can distill another self-contained test case for the limited
> > > > > freeze seen in
> > > > > cygwin-20170324, but that make take awhile.  I'm sending this ear=
ly
> > > > > report so
> > > > > you're aware of the possible regression in cygwin-20170324.
> > > >=20
> > > > I'm attaching a new test program that demonstrates the regression.
> > > > My previous
> > > > test program created sixteen processes that each picked a random
> > > > semaphore to
> > > > lock.  Now, each process picks two semaphores and locks them in
> > > > order.  This
> > > > proceeds smoothly on GNU/Linux and on cygwin-20170321.tar.xz
> > > > "cygserver -r 40".
> > > > It freezes within one second on cygwin-20170324.tar.xz "cygserver -r
> > > > 40".
> > >=20
> > > I suggest reverting the cygwin-20170324 cygserver changes for now.  O=
lder
> > > versions can be configured to have reliable sysv semaphores, but I
> > > think no
> > > settings render sysv semaphores reliable in Cygwin 2.8.0.  What do you
> > > think?
> >=20
> > Just FYI, Corinna is away for a bit (in European time, "a bit" =3D until
> > June ;-) ) so don't be surprised if her response is delayed.
> >=20
>=20
> as she is back, we can humble rise her attention to the matter.

I can do that, but wouldn't it be nice if somebody would actually
try to debug Cygserver further, to handle this new testcase correctly
as well?  6 weeks, and nobody actually tries.  Sigh.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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