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Date:      Tue, 1 May 2007 12:02:13 -0400
From:      Kris Kennaway <kris@obsecurity.org>
To:        Rick Macklem <rmacklem@uoguelph.ca>
Cc:        freebsd-fs@freebsd.org, Craig Boston <craig@xfoil.gank.org>, freebsd-current@freebsd.org, Peter Schuller <peter.schuller@infidyne.com>, Pawel Jakub Dawidek <pjd@freebsd.org>
Subject:   Re: ZFS committed to the FreeBSD base.
Message-ID:  <20070501160213.GA496@xor.obsecurity.org>
In-Reply-To: <Pine.GSO.4.63.0705011033410.23282@muncher>
References:  <20070407165759.GG8831@cicely12.cicely.de> <20070407180319.GH8831@cicely12.cicely.de> <20070407191517.GN63916@garage.freebsd.pl> <20070407212413.GK8831@cicely12.cicely.de> <20070410003505.GA8189@nowhere> <46365F76.7090708@infidyne.com> <20070430213043.GF67738@garage.freebsd.pl> <463665F2.8090605@infidyne.com> <46373CAD.6000502@infidyne.com> <Pine.GSO.4.63.0705011033410.23282@muncher>

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On Tue, May 01, 2007 at 10:41:10AM -0400, Rick Macklem wrote:
>=20
>=20
> On Tue, 1 May 2007, Peter Schuller wrote:
>=20
> >>This does seem to eliminate the problem here too.
> >
> >It appears the problem persists, but is more difficult to trigger.
> [stuff snipped]
> >It takes on the order of several hours to trigger it.
>=20
> I don't know if it relevent, but I've seen "kmem_map: too small" panics
> when testing my NFSv4 server, ever since about FreeBSD5.4. There is no
> problem running the same server code on FreeBSD4 (which is what I still
> run in production mode) or OpenBSD3 or 4. If I increase the size of the
> map, I can delay the panic for up to about two weeks of hard testing,
> but it never goes away. I don't see any evidence of a memory leak during
> the several days of testing leading up to the panic. (NFSv4 uses=20
> MALLOC/FREE extensively for state related structures.)

Sounds exactly like a memory leak to me.  How did you rule it out?

> So, I'm wondering if maybe there is some subtle bug in MALLOC/FREE (maybe
> i386 specific, since that's what I test on)?

That would be unlikely.

Kris

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