From: Max Kirillov <max@max630.net>
Date: Thu, 14 Feb 2019 22:33:34 GMT
Subject: Re: [PATCH 0/1] Fix hang in t5562, introduced in v2.21.0-rc1
Message-ID: <20190214223334.GE3064@jessie.local>
In-Reply-To: <005401d4c4b3$147aa8c0$3d6ffa40$@nexbridge.com>

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?