[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <d489c061-00ff-2b1c-cf96-c4cf1bb7b2b6@roeck-us.net>
Date: Thu, 1 Dec 2016 04:50:40 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: paulmck@...ux.vnet.ibm.com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
sparclinux@...r.kernel.org, davem@...emloft.net
Subject: Re: next: Commit 'mm: Prevent __alloc_pages_nodemask() RCU CPU stall
...' causing hang on sparc32 qemu
On 12/01/2016 04:34 AM, Paul E. McKenney wrote:
> On Wed, Nov 30, 2016 at 10:56:57PM -0800, Guenter Roeck wrote:
>> Hi Paul,
>>
>> On Wed, Nov 30, 2016 at 05:19:50PM -0800, Paul E. McKenney wrote:
>> [ ... ]
>>
>>>>>>
>>>>>> BUG: sleeping function called from invalid context at mm/page_alloc.c:3775
>> [ ... ]
>>>
>>> Whew! You had me going for a bit there. ;-)
>>
>> Bisect results are here ... the culprit is, again, commit 2d66cccd73 ("mm:
>> Prevent __alloc_pages_nodemask() RCU CPU stall warnings"), and reverting that
>> patch fixes the problem. Good that you dropped it already :-).
>
> "My work is done." ;-)
>
> And apologies for the hassle. I have no idea what I was thinking when
> I put the cond_resched_rcu_qs() there!
>
No worries.
Cheers,
Guenter
Powered by blists - more mailing lists