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From:   "Randall S. Becker" <rsbecker@nexbridge.com>
To:     "'Max Kirillov'" <max@max630.net>
Cc:     "'Johannes Schindelin via GitGitGadget'" <gitgitgadget@gmail.com>,
        <git@vger.kernel.org>, "'Junio C Hamano'" <gitster@pobox.com>
References: <pull.126.git.gitgitgadget@gmail.com> <005401d4c4b3$147aa8c0$3d6ffa40$@nexbridge.com> <20190214223334.GE3064@jessie.local>
In-Reply-To: <20190214223334.GE3064@jessie.local>
Subject: RE: [PATCH 0/1] Fix hang in t5562, introduced in v2.21.0-rc1
Date:   Thu, 14 Feb 2019 17:59:04 -0500
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On February 14, 2019 17:34, Max Kirillov wrote:
> On Thu, Feb 14, 2019 at 05:17:26PM -0500, Randall S. Becker wrote:
> > Unfortunately, subtest 13 still hangs on NonStop, even with this
> > patch, so our Pipeline still hangs. I'm glad it's better on Azure, but
> > I don't think this actually addresses the root cause of the hang. This
> > is now the fourth attempt at fixing this. Is it possible this is not
> > the test that is failing, but actually the git-http-backend? The code
> > is not in a loop, if that helps. It is not consuming any significant
> > cycles. I don't know that part of the code at all, sadly. The code is
> > here:
> >
> > * in the operating system from here up *
> >   cleanup_children + 0x5D0 (UCr)
> 
> ... so does the process which the stack was taken from has any children
> processes still?
> 
> I could imagine if a child somehow manages to end up in uninterruptible
> sleep, then probably it would never complete this way, wouldn't it?

>From what I can tell (previously reported), none of the children are dead.
git-http-backend is waiting and the others are in a read state. I can try to
get full stack traces once the current cycle ends.