Date: Fri, 17 Aug 2007 17:33:21 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: freebsd-current@freebsd.org Subject: panic unmounting filesystems Message-ID: <20070817073321.GA6321@turion.vk2pj.dyndns.org>
next in thread | raw e-mail | index | archive | help
--azLHFNyN32YCQGCU
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
After upgrading to current as of about 24 hours ago, I now consistently
get panics when I try to unmount filesystems with pending I/O. If I
just mount and unmount a filesystem, it works but if I try to unmount
a filesystem that has been active, I get:
handle_workitem_remove: vget: got error 16 while accessing filesystem
softdep_waitidle: Failed to flush worklist for 0xc2c6429c
panic: vfs_allocate_syncvnode: insmntque failed
I have a crashdump and the backtrace looks like:
#8 0xc055c545 in panic (fmt=3D0xc07309f1 "vfs_allocate_syncvnode: insmntqu=
e failed")
at /usr/src/sys/kern/kern_shutdown.c:547
#9 0xc05d6b9a in vfs_allocate_syncvnode (mp=3D0xc2c6429c) at /usr/src/sys/=
kern/vfs_subr.c:3111
#10 0xc05d1222 in dounmount (mp=3D0xc2c6429c, flags=3D0x8000000, td=3D0xc2d=
9c600) at /usr/src/sys/kern/vfs_mount.c:1289
#11 0xc05d16ff in unmount (td=3D0xc2d9c600, uap=3D0xd6218cfc) at /usr/src/s=
ys/kern/vfs_mount.c:1170
#12 0xc06de9ea in syscall (frame=3D0xd6218d38) at /usr/src/sys/i386/i386/tr=
ap.c:1008
#13 0xc06cc5c0 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s=
:196
According to kgdb, insmntque() returned both EXDEV and EBUSY. The former
is impossible so I suspect kgdb is confused and the latter is correct.
The mountpoint shows as in the process of being unmounted and has
mnt_nvnodelistsize =3D=3D 0 so insmntque() makes sense at the micro level.
Having a system panic as a result does not make sense.
The softdep_waitidle() error looks suspicious - at a quick glance, it
appears to only wait for 10 ticks (10msec) for the dependency chain to
empty. This seems unreasonably short for an operation that probably
includes physical I/O. Is my reasoning correct?
Does anyone have any suggestions on where to look next?
--=20
Peter Jeremy
--azLHFNyN32YCQGCU
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (FreeBSD)
iD8DBQFGxU9B/opHv/APuIcRAs3GAKCejOuCLQYUPtGpXdtJHXDx0dK/EACgg+3I
W676I9/UQQxOjH0nmikY+O4=
=qZWL
-----END PGP SIGNATURE-----
--azLHFNyN32YCQGCU--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070817073321.GA6321>