System deadlock when using mksnap_ffs

Tim Bishop tim-lists at
Wed Nov 12 10:22:42 PST 2008

On Wed, Nov 12, 2008 at 08:10:50PM +0200, David Peall wrote:
> > FreeBSD paladin 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #8: Mon Nov 10
> > 20:49:51 GMT 2008 tdb at paladin:/usr/obj/usr/src/sys/PALADIN  amd64
> > 
> > I run the mksnap_ffs command to take the snapshot and some time later
> > the system completely freezes up:
> If the file system is UFS2 it's a known problem but should have been
> fixed.
> ident /boot/kernel/kernel | grep subr_sleepqueue
> version should be greater than

Yes it's UFS2, and yes it's greater than

$FreeBSD: src/sys/kern/subr_sleepqueue.c,v 2008/09/16 20:01:57 jhb Exp $

Are you sure the problem referenced on that page is the same? It talks
about "dog slow" snapshotting, which I see on other filesystems and
machines. But in this particular case the system is dead, and does not


Tim Bishop
PGP Key: 0x5AE7D984

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