linux-kernel - Re: Possible mptsas regression post 3.5.0

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Message-ID: <1346132253.12384.6.camel@localhost.localdomain>
Date:	Mon, 27 Aug 2012 22:37:33 -0700
From:	Dan Williams <djbw@...com>
To:	John Drescher <drescherjm@...il.com>
CC:	王金浦 <jinpuwang@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>, <DL-MPTFusionLinux@....com>
Subject: Re: Possible mptsas regression post 3.5.0

On Mon, 2012-08-27 at 12:13 -0400, John Drescher wrote:
> >> I have bisected it down to the following patch:
> >>
> >> Bisecting: 0 revisions left to test after this (roughly 0 steps)
> >> [10f8d5b86743b33d841a175303e2bf67fd620f42] SCSI: fix hot unplug vs
> >> async scan race
> >>
> >> It appears this patch caused the bad behavior although I have not
> >> tested that yet. I am rebuilding the array (takes ~2 hours) from the
> >> previous good bisect.
> >>
> 
> Confirmed. This patch appears to cause the bug in my test setup.
> 
> [  339.406778] BUG: soft lockup - CPU#2 stuck for 23s! [kworker/u:8:2202]
[..]
> [  339.415268]  [<ffffffff8141782a>] scsi_remove_target+0xda/0x1f0

I wonder if we are preventing scsi_device_dev_release_usercontext() from
making forward progress?

...the attached patch should confirm this or give more info otherwise.

--
Dan


View attachment "dbg-scsi-remove-target.patch" of type "text/x-patch" (1552 bytes)