Date: Fri, 2 Dec 2005 08:40:55 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Robert Watson <rwatson@freebsd.org>, David Xu <davidxu@freebsd.org>, current@freebsd.org Subject: Re: After crash, / comes up mounted read-only, but in multiuser; mfs /tmp? Message-ID: <200512020840.58395.jhb@freebsd.org> In-Reply-To: <43904D18.5050503@freebsd.org> References: <20051202103751.T83839@fledge.watson.org> <43904D18.5050503@freebsd.org>
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On Friday 02 December 2005 08:33 am, David Xu wrote: > Robert Watson wrote: > > While testing the new DRM update (went badly :-), I crashed my system > > and had to power cycle it. When it came back up, not surprisingly, > > the file systems weren't clean. When I reached a login prompt, I > > logged in to modify /etc/rc.conf, and to my surprise, was told that > > /etc/rc.conf wasn't writable. Turns out it was because / was mounted > > read-only: > > > > ad0: 57231MB <HTS541060G9SA00 MB3IC60H> at ata0-master SATA150 > > acd0: CDRW <HL-DT-STCD-RW/DVD DRIVE GCC-4246N/0X05> at ata1-master UDMA= 33 > > Trying to mount root from ufs:/dev/ad0s3a > > WARNING: / was not properly dismounted > > Loading configuration files. > > kernel dumps on /dev/ad0s3b > > Entropy harvesting: interrupts ethernet point_to_point kickstart. > > swapon: adding /dev/ad0s3b as swap device > > Starting file system checks: > > /dev/ad0s3a: INCORRECT BLOCK COUNT I=3D16528 (4 should be 0) (CORRECTED) > > /dev/ad0s3a: UNREF FILE I=3D16528 OWNER=3Droot MODE=3D100444 > > /dev/ad0s3a: SIZE=3D0 MTIME=3DDec 2 10:33 2005 (CLEARED) > > /dev/ad0s3a: FREE BLK COUNT(S) WRONG IN SUPERBLK (SALVAGED) > > /dev/ad0s3a: SUMMARY INFORMATION BAD (SALVAGED) > > /dev/ad0s3a: BLK(S) MISSING IN BIT MAPS (SALVAGED) > > /dev/ad0s3a: 2378 files, 78670 used, 175145 free (441 frags, 21838 > > blocks, 0.2% > > fragmentation) > > /dev/ad0s3e: DEFER FOR BACKGROUND CHECKING > > /dev/ad0s3d: DEFER FOR BACKGROUND CHECKING > > WARNING: /usr was not properly dismounted > > WARNING: /var was not properly dismounted > > /var: mount pending error: blocks 4 files 1 > > Setting hostname: sesame.cam.watson.org. > > bge0: link state changed to DOWN > > bge0: no link ....bge0: link state changed to UP > > > > ... > > > > /dev/ad0s3a on / (ufs, local, read-only) > > devfs on /dev (devfs, local) > > /dev/ad0s3e on /usr (ufs, local, soft-updates) > > /dev/ad0s3d on /var (ufs, local, soft-updates) > > /dev/md0 on /tmp (ufs, local) > > > > The rc scripts helpfully mounted an MFS /tmp for me, which while > > friendly, succeeded in masking the problem and allowing the system to > > come up in a rather undesirable state (from my perspective). So it > > sounds like maybe / wasn't remounted properly, and then the scripts > > were too helpful thinking it was a diskless system. > > > > Robert N M Watson > > I have seen this for some days, one machine I even have to reinstall > the system because mount -u / does not work. :-( I've seen reports that mount -u -w / works whereas mount -u -o rw / doesn't= ,=20 so you might be able to mount -u -w / in single user mode after running fsc= k=20 as a way to recover. Either that or boot single user, run fsck, and then=20 reboot before going into multiuser. =2D-=20 John Baldwin <jhb@FreeBSD.org> =A0<>< =A0http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" =A0=3D =A0http://www.FreeBSD.org
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