kern/94261: [ufs2] deadlock between ffs_mksnap and mysnc

[Kris Kennaway]

The following reply was made to PR kern/94261; it has been noted by GNATS.

From: Kris Kennaway <kris at obsecurity.org>
To: Steve Watt <steve at Watt.COM>
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: kern/94261: [ufs2] deadlock between ffs_mksnap and mysnc
Date: Thu, 9 Mar 2006 12:40:44 -0500

 On Wed, Mar 08, 2006 at 11:15:43PM -0800, Steve Watt wrote:
 
 > >Environment:
 > System: FreeBSD wattres.Watt.COM 5.5-PRERELEASE FreeBSD 5.5-PRERELEASE #11: Wed Mar 1 10:54:09 PST 2006 root at wattres.Watt.COM:/usr/obj/usr/src/sys/WATTRES i386
 > 
 > 
 > 	
 > >Description:
 > 
 > Per a thread on -hackers back in May '05 titled "snapshots and innds",
 > I'm finally getting around (sorry) to filing the PR.
 > 
 > I got a kernel core dump that I can do useful stuff with.  The system
 > was mostly operating normally, except that any attempt to access the
 > /news partition (which has articles, tradspool.map, overviews, and
 > incoming/outgoing data) would get stuck in "suspfs".
 > 
 > So I forced a dump from ddb.  The mount point does (as one would
 > expect) have MNTK_SUSPEND set.
 > 
 > I see mksnap_ffs sitting waiting for "ufs" (really vnode 0xc19af318),
 > which it got to via:
 
 This is probably fixed with Tor's latest commits to 6.1.  I don't know
 if he intends to merge the changes to 5.5, but that branch is
 basically dead and you should upgrade to 6.x.  Can you confirm it is
 fixed in 6.1?
 
 Kris