Date: Mon, 30 Aug 1999 15:48:59 +0930 From: Greg Lehey <grog@lemis.com> To: Parag Patel <parag@cgt.com> Cc: Matthew Dillon <dillon@apollo.backplane.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: <19990830154858.B13904@freebie.lemis.com> In-Reply-To: <80967.935993388@pinhead.parag.codegen.com>; from Parag Patel on Sun, Aug 29, 1999 at 11:09:48PM -0700 References: <dillon@apollo.backplane.com> <80967.935993388@pinhead.parag.codegen.com>
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On Sunday, 29 August 1999 at 23:09:48 -0700, Parag Patel wrote: > On Sun, 29 Aug 1999 22:59:22 PDT, Matthew Dillon wrote: >> >> This is definitely a pbuf. Did you apply the patches Greg emailed? >> They will panic the machine earlier while it is still in the correct >> stack frame, allowing Greg to track down where the I/O initiation came >> from. > > 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. To expand on what Parag says, the check in launch_requests shows no problems with the buffer headers, but the check in biodone catches a bp with B_CALL set and b_iodone set to NULL. I'd guess that something in the iodone chain code is incorrect. Unfortunately, there were so many active requests that I couldn't find the one that caused the crash in the log buffer; theoretically it might even have nothing to do with it. Does this ring a bell with anybody? 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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