linux-kernel - RE: [PATCH] 4/4 block: explicit plugging

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Message-ID: <000001c72f87$5bd8e520$ce34030a@amr.corp.intel.com>
Date:	Wed, 3 Jan 2007 14:34:38 -0800
From:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
To:	"'Jens Axboe'" <jens.axboe@...cle.com>
Cc:	"Andrew Morton" <akpm@...l.org>, <linux-kernel@...r.kernel.org>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Nick Piggin" <npiggin@...e.de>
Subject: RE: [PATCH] 4/4 block: explicit plugging

Jens Axboe wrote on Wednesday, January 03, 2007 2:30 PM
> > We are having some trouble with the patch set that some of our fiber channel
> > host controller doesn't initialize properly anymore and thus lost whole
> > bunch of disks (somewhere around 200 disks out of 900) at boot time.
> > Presumably FC loop initialization command are done through block layer etc.
> > I haven't looked into the problem closely.
> > 
> > Jens, I assume the spin lock bug in __blk_run_queue is fixed in this patch
> > set?
> 
> It is. Are you still seeing problems after the initial mail exchange we
> had prior to christmas,

Yes. Not the same kernel panic, but a problem with FC loop reset itself.


> or are you referencing that initial problem?

No. we got passed that point thanks for the bug fix patch you give me
prior to Christmas.  That fixed a kernel panic on boot up.


> It's not likely to be a block layer issue, more likely the SCSI <->
> block interactions. If you mail me a new dmesg (if your problem is with
> the __blk_run_queue() fixups), I can take a look. Otherwise please do
> test with the __blk_run_queue() fixup, just use the current patchset.

I will just retake the tip of your plug tree and retest.
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