linux-kernel - Re: please fix FUSION (Was: [v3.13][v3.14][Regression] kthread:makekthread

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Message-ID: <20140320192307.GA11883@redhat.com>
Date:	Thu, 20 Mar 2014 20:23:07 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	JBottomley@...allels.com, Nagalakshmi.Nandigama@....com,
	Sreekanth.Reddy@....com, rientjes@...gle.com,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	tj@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	kernel-team@...ts.ubuntu.com, linux-scsi@...r.kernel.org
Subject: Re: please fix FUSION (Was: [v3.13][v3.14][Regression]
	kthread:makekthread_create()killable)

On 03/20, Joseph Salisbury wrote:
>
> On 03/19/2014 03:42 PM, Oleg Nesterov wrote:
> > On 03/19, Oleg Nesterov wrote:
> >> On 03/19, Oleg Nesterov wrote:
> >>> But please do not forget that the kernel crashes. Whatever else we do, this
> >>> should be fixed anyway. And this should be fixed in driver.
> >> drivers/message/fusion/ is obviously buggy.
> > Perhaps this is the only problem and Tetsuo is right, this driver
> > really needs more than 30 secs to probe...
> >
> > But if you have a bit of free time, perhaps you can try the stupid
> > debugging patch below ;) Not sure it will help, but who knows.
> >
> > Oleg.
>
> There was some testing done with your test kernel.  The data collected
> while running your kernel is available in the bug report:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1276705/comments/58

Joseph, thanks a lot.

I'll try to read the logs tomorrow, but at first glance Tetsuo was right,
I do not see a "long" sleep in that log. And it shows that the hack around
kthread_run() in scsi_host_alloc() won't help. I am wondering why I didn't
realize this before ;)

Hmm. Perhaps we should simply change mptsas_init() to block all signals
until we have the right fix.

Oleg.

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