Date: Fri, 7 Aug 2009 21:13:34 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Boris Kochergin <spawk@acm.poly.edu> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS RAID-Z panic on vdev failure + subsequent panics and hangs Message-ID: <20090807191334.GA1814@garage.freebsd.pl> In-Reply-To: <4A7C3002.8000003@acm.poly.edu> References: <4A78AA71.9050107@acm.poly.edu> <4A78AFB2.10103@acm.poly.edu> <20090805115621.GG1784@garage.freebsd.pl> <4A798A12.4070408@acm.poly.edu> <20090807073738.GA1607@garage.freebsd.pl> <20090807074400.GB1607@garage.freebsd.pl> <4A7C3002.8000003@acm.poly.edu>
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On Fri, Aug 07, 2009 at 09:45:38AM -0400, Boris Kochergin wrote:
> Maybe my kgdb chops aren't up to par, but I can't seem to see what=20
> ab_prev points to:
>=20
> (kgdb) up
> #12 0xffffffff8103a9e7 in arc_evict (state=3DVariable "state" is not=20
> available.
> ) at=20
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs=
/arc.c:1489
> 1489 if (recycle && ab->b_size !=3D bytes &&
> Current language: auto; currently c
> (kgdb) list
> 1484 LBOLT - ab->b_arc_access <=20
> arc_min_prefetch_lifespan)) {
> 1485 skipped++;
> 1486 continue;
> 1487 }
> 1488 /* "lookahead" for better eviction candidate */
> 1489 if (recycle && ab->b_size !=3D bytes &&
> 1490 ab_prev && ab_prev->b_size =3D=3D bytes)
> 1491 continue;
> 1492 hash_lock =3D HDR_LOCK(ab);
> 1493 have_lock =3D MUTEX_HELD(hash_lock);
> (kgdb) print ab
> $13 =3D (arc_buf_hdr_t *) 0xffffff0003ebc410
> (kgdb) print ab->b_size
> $14 =3D 1
> (kgdb) print bytes
> $15 =3D 16384
> (kgdb) print ab_prev
> No symbol "ab_prev" in current context.
Yeah, that's strange indeed. Could you try:
print ab->b_arc_node.list_prev
print ab->b_arc_node.list_next
--=20
Pawel Jakub Dawidek http://www.wheel.pl
pjd@FreeBSD.org http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!
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