linux-kernel - Re: kernel BUG at drivers/block/cciss.c:1260! (with recent linux-2.6 tree)

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Date:	Tue, 29 Jan 2008 10:49:29 -0800
From:	Andrew Vasquez <andrew.vasquez@...gic.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mike.miller@...com, k-ueda@...jp.nec.com, j-nomura@...jp.nec.com
Subject: Re: kernel BUG at drivers/block/cciss.c:1260! (with recent
	linux-2.6  tree)

On Tue, 29 Jan 2008, Jens Axboe wrote:

> On Tue, Jan 29 2008, Andrew Vasquez wrote:
> > On Tue, 29 Jan 2008, Jens Axboe wrote:
> > 
> > > > Here the final snippet that was logged:
> > > > 
> > > > [   12.724997] input: USB HID v1.01 Mouse [HP Virtual Keyboard] on usb-0000:01:04.4-1
> > > > [   12.728971] usbcore: registered new interface driver usbhid
> > > > [   12.732866] drivers/hid/usbhid/hid-core.c: v2.6:USB HID core driver
> > > > [   12.741172] TCP cubic registered
> > > > [   12.744506] NET: Registered protocol family 1
> > > > [   12.744884] NET: Registered protocol family 17
> > > > [   12.749217] Freeing unused kernel memory: 228k freed
> > > > [   12.885823] cciss rq: dev cciss/c0d0: type=2, flags=104c8
> > > > [   12.888929] 
> > > > [   12.888930] sector 6510615555426900570, nr/cnr 0/0
> > > > [   12.892895] bio ffff81042f130730, biotail ffff81042f130730, buffer 0000000000000000, data 0000000000000000, len 0
> > > > [   12.896895] cdb: 12 00 00 00 fe 00 00 00 00 00 00 00 00 00 00 00 
> > > 
> > > Ah ok, I see the problem... cciss is overriding the data_len for
> > > BLOCK_PC requests, hence it does not complete them properly. Hmm. Does
> > > this work?
> > > 
> > > diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> > > index ef50068..b6fa52e 100644
> > > --- a/drivers/block/cciss.c
> > > +++ b/drivers/block/cciss.c
> > > @@ -2524,7 +2524,6 @@ after_error_processing:
> > >  		resend_cciss_cmd(h, cmd);
> > >  		return;
> > >  	}
> > > -	cmd->rq->data_len = 0;
> > >  	cmd->rq->completion_data = cmd;
> > >  	blk_complete_request(cmd->rq);
> > >  }
> > 
> > 
> > Things look good so far -- with the patch above I can finally boot the
> > machine.
> 
> Cool, sorry about that. Will get that applied asap. So after this patch
> was applied, you didn't see any debug messages from blk_dump_rq_flags()
> anymore, right?

That's correct.  I've yet to see any additional debug-messages from
blk_dump_rq_flags().

--
av
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