Date: Fri, 13 Mar 2009 14:08:03 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Attilio Rao <attilio@FreeBSD.org> Cc: Pawel Jakub Dawidek <pjd@FreeBSD.org>, Mark Powell <M.S.Powell@salford.ac.uk>, "freebsd-current@freebsd.org" <freebsd-current@FreeBSD.org>, Tim Kientzle <kientzle@FreeBSD.org>, Anonymous <swell.k@gmail.com>, Peter Schuller <peter.schuller@infidyne.com> Subject: Re: repeatable ZFS panic: share->excl Message-ID: <49BAA103.2060508@FreeBSD.org> In-Reply-To: <49BA9801.5080505@FreeBSD.org> References: <20090312175345.Y80227@rust.salford.ac.uk> <20090312191333.GA97342@hyperion.scode.org> <49B97617.8010709@freebsd.org> <86r6124f2v.fsf@gmail.com> <3bbf2fe10903122035i20b2767cod2322c39c6f850ee@mail.gmail.com> <29C8FA04-D5B1-49B7-ACF0-4185537367B0@baldwin.cx> <3bbf2fe10903122156u650417f0s5c49b68bdf4ffa07@mail.gmail.com> <49BA9801.5080505@FreeBSD.org>
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John Baldwin wrote: > Attilio Rao wrote: >> 2009/3/13, John Baldwin <john@baldwin.cx>: >>> This is similar to the patch I've asked lulf@ to test except that it >>> is longer and I fix a bug where zfs_lookup() can leak a vnode lock if >>> the access check fails. :-) The last one I sent to lulf@ is at >>> www.FreeBSD.org/~jhb/patches/zfs_ea.patch. >> >> I really thought zfs_lookup() was returning the lock held as a feature >> assming no LOCKLEAF. Is that a bug instead? > > Yes, I think that is the real bug. Looking at this further I think > zfs_get_xattrdir() will return the vnode locked if it has to create a > new node via zfs_make_attrdir() but only returns it held and unlocked if > it finds an existing one. So my new patch is to just fix > zfs_get_xattrdir() to unlock the vnode if it creates a new one like so: > > (Sorry, TBird is probably going to butcher all the whitespace): > > --- > //depot/user/jhb/lock/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c > +++ > /Users/jhb/work/p4/lock/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c > > @@ -940,6 +940,7 @@ > /* NB: we already did dmu_tx_wait() if necessary */ > goto top; > } > + VOP_UNLOCK(*xvpp, 0); > > return (error); > } > > A non-butchered version is at www.FreeBSD.org/~jhb/patches/zfs_ea.patch. So lulf@ reports success with this patch. Pawel, can you review it? -- John Baldwin
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