RCU lockup issues when CONFIG_SOFTLOCKUP_DETECTOR=n - any one else seeing this?

[David Miller]

From: Boqun Feng <boqun.feng at gmail.com>
Date: Fri, 28 Jul 2017 20:54:16 +0800

> Hi Jonathan,
> 
> FWIW, there is wakeup-missing issue in swake_up() and swake_up_all():
> 
> 	https://marc.info/?l=linux-kernel&m=149750022019663
> 
> and RCU begins to use swait/wake last year, so I thought this could be
> relevant.
> 
> Could you try the following patch and see if it works? Thanks.

Just FYI I'm testing this patch now on sparc64...