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Date:      Fri, 31 Jan 2014 18:57:16 +0400
From:      "Marat N.Afanasyev" <amarat@li.ru>
To:        John Baldwin <jhb@freebsd.org>, Yamagi Burmeister <lists@yamagi.org>
Cc:        stable@freebsd.org, yerenkow@gmail.com, freebsd-stable@freebsd.org
Subject:   Re: 10.0, csh history merge broken?
Message-ID:  <52EBB9CC.2080802@li.ru>
In-Reply-To: <201401291214.56887.jhb@freebsd.org>
References:  <52E0E917.3060403@li.ru> <201401281147.15801.jhb@freebsd.org> <20140129090624.615af8881fe6df55c9663b5c@yamagi.org> <201401291214.56887.jhb@freebsd.org>
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[-- Attachment #1 --]
John Baldwin wrote:
> On Wednesday, January 29, 2014 3:06:24 am Yamagi Burmeister wrote:
>> On Tue, 28 Jan 2014 11:47:15 -0500
>> John Baldwin <jhb@freebsd.org> wrote:
>>
>>> On Monday, January 27, 2014 3:55:53 am Alexander Yerenkow wrote:
>>>>   >Maybe it would be a good idea to cherry pick those two revisions and
>>>>   >merge then into FreeBSD, until a new tcsh version is released.
>>>>
>>>> I think this is must, since currently any regular shutdown can break
> login
>>>> ability (if server is high loaded + history file is broken and big
> enough).
>>>> I have now locked history file with chflags until fix will come.
>>>
>>> These changes are already present in HEAD (FreeBSD 11) and will probably
>>> be merged by the next 10 release.
>>
>> Really? As far as I can see the last commit to head/contrib/tcsh was
>> the update to 6.18.01 one 22/02/2012 by mp@. While 6.18.01 featured a
>> new, much faster history merge logic which minimized the race window,
>> the root cause wasn't solve. Only the two upstream commits (from
>> 08/12/2013 and 11/12/2013) linked above brought real locking to the
>> merge process, serializing it between several tcsh instances.
>
> Bah, somehow I had thought I had seen the 'lock' keyword in tcsh on my
> HEAD box, but I don't see it there now.
>
So, can we hope to have these patches appear in HEAD and MFC to, at 
least, -stable soon? ;)

-- 
SY, Marat


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