From owner-freebsd-stable@freebsd.org  Wed Aug  5 14:11:22 2015
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Message-ID: <1438783814.70393.138.camel@freebsd.org>
Subject: Re: 8-stable crashing recently in ufsdirhash
From: Ian Lepore <ian@freebsd.org>
To: parv <parv@bitter-almonds.com>
Cc: freebsd-stable@freebsd.org
Date: Wed, 05 Aug 2015 08:10:14 -0600
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On Tue, 2015-08-04 at 23:54 -1000, parv wrote:
> Please CC me as I cannot properly use my laptop, Thinkpad X200 (i386).
> 
> 8-stable has been crashing a lot since source update of Jul 2015[0]. After building debug kernel, kgdb shows lock reversal order & in ufsdirhash. File systems (/, var, misc) are all UFS, with var & misc having soft updates enabled.
> 
> Crash had happened just after boot (during mktemp); when I tried to delete a directory (/misc/obj); when I tried to edit (vi /etc/fstab) so that / would be mounted readonly. Most recent crash ...
> 
> http://imagebin.ca/v/2B50NARvIHsH
> 
> Any clue would be appreciated.
> 
>   - parv
> 
> 
> [0] crash also happened while svn was trying to update source of 8. Now "svn log" wants to connect to the remote repo instead of showing the current revision.
> 

When you say you built a debug kernel, does that include option
WITNESS_KDB?  If so, remove that so you can find the real error.  LORs
related to ufs_dirhash have been reported for years, and nobody with the
appropriate skills seems to be interested in fixing them; they just get
declared to be harmless.  (IMO the spewage related to this makes witness
essentially useless.)

-- Ian