Date: Mon, 30 Aug 1999 15:52:24 +0930 From: Greg Lehey <grog@lemis.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Parag Patel <parag@cgt.com>, Bernd Walter <ticso@cicely.de>, Mike Smith <mike@smith.net.au>, freebsd-current@FreeBSD.ORG Subject: Re: 4.0-CURRENT SMP crash with vinum raid-5 and softupdates Message-ID: <19990830155224.C13904@freebie.lemis.com> In-Reply-To: <199908300615.XAA10147@apollo.backplane.com>; from Matthew Dillon on Sun, Aug 29, 1999 at 11:15:47PM -0700 References: <80967.935993388@pinhead.parag.codegen.com> <199908300615.XAA10147@apollo.backplane.com>
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On Sunday, 29 August 1999 at 23:15:47 -0700, Matthew Dillon wrote: >> Greg's debugging this on the machine here at the moment, which is >> crashing the same way in what appears to be the same place. >> >> If anyone else wants to take a crack it, the magic vinum debug number >> needed is 328 and not 324. >> >> So far Greg's discovered that the field is correctly set a little while >> before the crash, and then becomes NULL for no apparent reason. Looks >> like a really nasty bug. >> >> The nice thing is this loaner machine has no real job to do besides >> crashing, so it can crash as often as required. :) > > I looked at the vinum code a little. I would look for possible situations > where the bp may be re-issued as an I/O before actually completing a prior > I/O. This could cause the iodone field to be cleared in the middle of > an I/O. I don't see anything specific in the code because I don't really > understand it yet. That's the best possibility that I can come up with. Well, I don't do things like that. The only place I reissue a command is in the iodone routine (complete_rqe or complete_raid5_write; the latter in this case). Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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