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

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