Hello，Paul I use a new NUC (made in 2017) to test, meet the same hang. System run very slowly. But I use my PC (made before 2015), test V3.18.136+ patch for 12 hours, still well. Maybe V3.18.y don't support some new devices. -----Original Message----- From: Paul E. McKenney [mailto:paulmck@xxxxxxxxxxxxx] Sent: Tuesday, March 26, 2019 23:56 To: He, Bo <bo.he@xxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; stable@xxxxxxxxxxxxxxx; Zhang, Jun <jun.zhang@xxxxxxxxx>; Xiao, Jin <jin.xiao@xxxxxxxxx>; Bai, Jie A <jie.a.bai@xxxxxxxxx> Subject: Re: [PATCH 3.18 132/134] rcu: Do RCU GP kthread self-wakeup from softirq and interrupt On Tue, Mar 26, 2019 at 08:43:45AM +0000, He, Bo wrote: > Hi, Paul: > I have tried on my PC and not hit any hang issue with RCU torture test for one hour, the configurations are like: > OS: ubuntu 16.04 > kenrel: 3.18.136 + 3.18 rcu patch > CPU: Intel(R) Xeon(R) CPU E3-1225 V2 @ 3.20GHz Sounds good, please proceed! Thanx, Paul > -----Original Message----- > From: Paul E. McKenney <paulmck@xxxxxxxxxxxxx> > Sent: Tuesday, March 26, 2019 12:00 AM > To: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: He, Bo <bo.he@xxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; > stable@xxxxxxxxxxxxxxx; Zhang, Jun <jun.zhang@xxxxxxxxx>; Xiao, Jin > <jin.xiao@xxxxxxxxx>; Bai, Jie A <jie.a.bai@xxxxxxxxx> > Subject: Re: [PATCH 3.18 132/134] rcu: Do RCU GP kthread self-wakeup > from softirq and interrupt > > On Sat, Mar 23, 2019 at 07:33:15AM +0100, Greg Kroah-Hartman wrote: > > On Fri, Mar 22, 2019 at 04:00:17PM +0000, He, Bo wrote: > > > Hi, Greg: > > > Can you hold on the 3.18-stable branch, it seems there are some issue, please see the comments from Paul: > > > > > > Comments from Paul: > > > I subjected all of the others to light rcutorture testing, which > > > they passed. This v3.18 patch hung, however. Trying it again > > > with stock > > > v3.18 got the same hang, so I believe we can exonerate the patch and give it a good firm "maybe" on 3.18. > > > > > > Worth paying special attention to further test results from 3.18.x, though! > > > > Ok, I've dropped this from the 3.18.y queue now, thanks. > > Bo, if you know of a "y" for 3.18.y that would likely pass rcutorture testing, please let me know. > > Thanx, Paul >
