linux-kernel - Re: [PATCH] v2 Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009

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Date:	Mon, 08 Jun 2009 03:18:18 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org
Cc:	Chris Adams <cmadams@...aay.net>, 510478@...s.debian.org
Subject: Re: [PATCH] v2 Re: Bug: Status/Summary of slashdot leap-second
 crash on new years 2008-2009

On Sat, 2009-01-03 at 12:01 -0600, Chris Adams wrote:
> Once upon a time, Duane Griffin <duaneg@...da.com> said:
> > How about instead of a switch statement, assigning the message to a
> > variable and printing that. I.e. something like:
> 
> Good point.  Here's an updated version that also adds a comment to the
> xtime_lock definition about not using printk.
> -- 
> Chris Adams <cmadams@...aay.net>
> Systems and Network Administrator - HiWAAY Internet Services
> I don't speak for anybody but myself - that's enough trouble.
> 
> 
> From: Chris Adams <cmadams@...aay.net>
> 
> The code to handle leap seconds printks an information message when the
> second is inserted or deleted.  It does this while holding xtime_lock.
> However, printk wakes up klogd, and in some cases, the scheduler tries
> to get the current kernel time, trying to get xtime_lock (which results
> in a deadlock).  This moved the printks outside of the lock.  It also
> adds a comment to not use printk while holding xtime_lock.
[...]

This patch doesn't seem to have gone anywhere.  Was this bug fixed in
some other way or has it been forgotten?

Ben.

-- 
Ben Hutchings
Logic doesn't apply to the real world. - Marvin Minsky

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