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From: Eric Anholt <eta@lclark.edu>
To: Dag-Erling =?ISO-8859-1?Q?Sm=F8rgrav?= <des@des.no>
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Date: Sun, 20 Feb 2005 13:43:17 -0800
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cc: amd64@freebsd.org
Subject: Re: VM panics
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On Sun, 2005-02-20 at 14:55 +0100, Dag-Erling Sm=F8rgrav wrote:
> With recent -CURRENT, I get recurrent VM panics on amd64:
>=20
> panic: mutex vm object not owned at /usr/src/sys/vm/vm_page.c:608
>=20
> which corresponds to the following code at the beginning of in
> vm_page_remove():
>=20
> 605:        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
> 606:        if ((object =3D m->object) =3D=3D NULL)
> 607:                return;
> 608:        VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
> 609:        if (m->flags & PG_BUSY) {
> 610:                vm_page_flag_clear(m, PG_BUSY);
> 611:                vm_page_flash(m);
>=20
> This only happens under load (e.g. buildworld).
>=20
> Serial console does not work properly ("sio0: configured irq 3 not in
> bitmap of probed irqs 0"), and I don't currently have a firewire
> cable.

Same for me, and it takes very little to trigger -- savecore of my first
dump reproduced it twice.

Backtrace (copied from digicam due to broken kgdb):
panic()
_mtx_assert()
vm_page_remove()
vm_page_free_toq()
vm_page_free()
uma_small_free()
zone_drain()
zone_foreach()
uma_reclaim()
vm_pageout()
fork_exit()
fork_trampoline)


--=20
Eric Anholt                                eta@lclark.edu         =20
http://people.freebsd.org/~anholt/         anholt@FreeBSD.org