kern/136945: [ufs] [lor] filedesc structure/ufs (poll)

[John Baldwin]

On Tuesday 28 July 2009 10:03:40 am Rene Ladan wrote:
> 2009/7/28 John Baldwin <jhb at freebsd.org>:
> > On Monday 27 July 2009 10:00:05 am Rene Ladan wrote:
> >> The following reply was made to PR kern/136945; it has been noted by 
GNATS.
> >>
> >> From: Rene Ladan <rene at freebsd.org>
> >> To: John Baldwin <jhb at freebsd.org>
> >> Cc: bug-followup at freebsd.org
> >> Subject: Re: kern/136945: [ufs] [lor] filedesc structure/ufs (poll)
> >> Date: Mon, 27 Jul 2009 15:51:15 +0200
> >>
> >>  2009/7/27 John Baldwin <jhb at freebsd.org>:
> >>  > I would actually expect this to be the correct order for these two
> > locks.=
> >>   =A0Can
> >>  > you capture the output of the 'debug.witness.fullgraph' sysctl to a 
file?
> >>  >
> >>  Yes, see attachment.  I'm still running the same 8.0-BETA2.
> >
> > Hmm, the attachment was eaten by a grue, can you post the file somewhere?
> >
> Yes, see ftp://rene-ladan.nl/pub/freebsd/kern_136945.txt

Ok, it looks like it did encounter a UFS -> filedesc order at some point.  Can 
you patch sys/kern/subr_witness.c to add a section to the order_lists[] array 
after the 'ZFS locking list' and before the spin locks list that looks like 
this:

	{ "filedesc structure", &lock_class_sx },
	{ "ufs", &lock_class_lockmgr},
	{ NULL, NULL },

-- 
John Baldwin