5.2-BETA: giving up on 4 buffers (ata)

Sławek Żak szak at era.pl
Wed Nov 26 11:03:28 PST 2003

"Kevin Oberman" <oberman at es.net> writes:

>> Date: Wed, 26 Nov 2003 19:37:45 +0100
>> From: Matthias Andree <matthias.andree at gmx.de>
>> Sender: owner-freebsd-current at freebsd.org
>> Hi,
>> when I rebooted my 5.2-BETA (kernel about 24 hours old), it gave up on
>> flushing 4 dirty blocks.
>> I had three UFS1 softdep file systems mounted on one ATA drive, one ext2
>> file system on another ATA drive and one ext2 file system on a SCSI
>> drive.  Both ext2 file systems had been mounted read-only, so they can't
>> have had dirty blocks.
>> At the next reboot, FreeBSD checked all three UFS file systems as they
>> hadn't been umounted cleanly before. Makes me wonder if FreeBSD gave up
>> on the super blocks...
> This looks like a GEOM related issue, although I am not completely sure
> of this.
> I have observed the following:
> System dies leaving the file systems dirty. (File systems have
> soft-updates enabled.)
> I reboot to single user and fsck all partitions including the root.
> I halt or reboot.
> I get a number of dirty buffers and the syncer eventually gives up.
> If I issue a "mount -u /" before shutting down, the problem does not
> occur. Why I should be able to get dirty buffers on a file system that
> has never been mounted as RW, I don't understand, but I see it every
> time I reboot after a crash.

    It happened to me many times on various machines. Some running 4.x, so no
    GEOM. I wonder why all the file systems are marked dirty. The buffers are
    associated with specific device anyway.


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