Date: Wed, 24 Nov 2004 10:26:21 -0700 From: Scott Long <scottl@freebsd.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-stable@freebsd.org Subject: Re: 5-STABLE softupdates issue? Message-ID: <41A4C43D.8020304@freebsd.org> In-Reply-To: <20041124171855.GE95873@dan.emsphone.com> References: <m3zn17a2mj.fsf@merlin.emma.line.org> <41A4944C.6030808@freebsd.org> <20041124171855.GE95873@dan.emsphone.com>
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Dan Nelson wrote: > In the last episode (Nov 24), Scott Long said: > >>Matthias Andree wrote: >> >>>out of fun and to investigate claims about alleged bgfsck resource >>>hogging (which I could not reproduce) posted to >>>news:de.comp.os.unix.bsd, I pressed the reset button on a live >>>FreeBSD 5-STABLE system. >>> >>>Upon reboot, fsck -p complained about an unexpected softupdates >>>inconsistency on the / file system and put me into single user >>>mode, the manual fsck / then asked me to agree to increasing a link >>>count from 21 to 22 (and later to fix the summary, which I consider >>>a non-issue). A subsequent fsck -p / ended with no abnormality >>>detected. >> >>No, this in theory should not happen. YOu could have caught it right >>at the instance that it was sending a transaction out to disk, or you >>could have caught an edge case that isn't understood yet. >>Unfortunately, ATA drives also cannot be trusted to flush their >>caches when one would expect, so this leaves open a lot of possible >>causes for your problem. > > > If you just want to test stability in the face of system crashes (and > not power failure), you can drop to DDB and run "reboot" to simulate a > panic (or run reboot -qn as root). That way your drive doesn't lose > power. > > That said, I get unexpected softupdates inconsistencies pretty > regularly on kernel panics. I just let the system run until I can > reboot and run a fsck -p. > I wonder if this points to dependencies not being pushed out of the buffer/cache correctly. That said, I rarely, if ever, see softupdate problems on my SCSI development systems, but that might just be coincidence. Scott
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