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Date: Fri, 18 Sep 2009 00:59:42 +0200
From: Patrick Lamaiziere <patfbsd@davenulle.org>
To: freebsd-current@freebsd.org
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Subject: Re: [ZFS] panic vm_fault : fault on no fault entry (when superpages
 are enabled)
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Le Thu, 17 Sep 2009 13:21:27 +0200,
Patrick Lamaiziere <patfbsd@davenulle.org> a =E9crit :

Hello,

> [8.0 BETA-4/i386]
>=20
> I've got this panic when copying /usr on a new pool.
> It's 100% reproductible here with=20
> tar cf - -C /usr . |=A0tar xpvf - -C /pool
>=20
> The panic occurs always with free() in the ZFS code.

...

> /boot/loader.conf
> # ZFS
> vm.kmem_size=3D"512M"
> vm.kmem_size_max=3D"512M"
> vfs.zfs.arc_max=3D"40M"
> vfs.zfs.vdev.cache.size=3D"5M"
>=20
> and options KVA_PAGES=3D512 in my kernel

I think I've found the culprit: superpages.

With vm.pmap.pg_ps_enabled=3D"1", my box will panic in the next
five minutes when doing a simple tar on ZFS.

Looks good without the superpages. Is it a known problem?

Thanks, regards.