10.0, csh history merge broken?

[Yamagi Burmeister]

On Tue, 28 Jan 2014 11:47:15 -0500
John Baldwin <jhb at 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 at . 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. 

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