linux-kernel - Re: INFO: task rcuc/0:7 blocked for more than 120 seconds.

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Message-ID: <20120103203717.GA6701@suse.de>
Date:	Tue, 3 Jan 2012 12:37:17 -0800
From:	Greg KH <gregkh@...e.de>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: INFO: task rcuc/0:7 blocked for more than 120 seconds.

On Tue, Jan 03, 2012 at 12:27:16PM -0800, Paul E. McKenney wrote:
> On Tue, Dec 27, 2011 at 08:29:59PM -0800, Paul E. McKenney wrote:
> > On Tue, Dec 27, 2011 at 11:13:23AM +0200, Sasha Levin wrote:
> > > On Mon, 2011-12-26 at 08:31 -0800, Paul E. McKenney wrote:
> > > > Except that when I try looking for task_notify_func() in current mainline,
> > > > I get nothing.
> > > > 
> > > > Where is task_notify_func() coming from? 
> > > 
> > > I was testing linux-next, it actually comes from the android tree:
> > > drivers/staging/android/lowmemorykiller.c
> > 
> > That does sound familiar...  I wonder if the stuff in staging is current
> > Android or historical stuff.
> 
> And memory did serve for once.  ;-)
> 
> Current Android has the following for task_notify_func():
> 
> static int
> task_notify_func(struct notifier_block *self, unsigned long val, void *data)
> {
> 	struct task_struct *task = data;
> 
> 	if (task == lowmem_deathpending)
> 		lowmem_deathpending = NULL;
> 
> 	return NOTIFY_OK;
> }
> 
> This is from https://android.googlesource.com/kernel/common.git.
> 
> Commit 5545554aac04918ece318270d63cbfcb015577a9 fixed this problem.
> The commit is shown below, FYI.
> 
> Greg, would it be possible to pull in the current Android code?  There
> have been a few fixes.  ;-)

I did base the stuff in staging on the common.git tree, but for some
reason this patch wasn't applied, odd, I'll go apply it now...

Ah, I see, it didn't apply for various reasons:

patching file drivers/staging/android/lowmemorykiller.c
Hunk #1 FAILED at 71.
Hunk #2 FAILED at 168.
Hunk #3 succeeded at 196 (offset 11 lines).
Hunk #4 succeeded at 204 (offset 11 lines).

Care to rebase this patch and send it to me so that I can apply it?  I
don't have the time to do it myself at the moment, sorry, lots of higher
priority items to get done this week, sorry.

greg k-h
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