Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2019-04-15 Thread Paul E. McKenney
On Mon, Apr 15, 2019 at 04:35:24PM +0300, Ville Syrjälä wrote: > On Mon, Nov 26, 2018 at 02:01:22PM -0800, Paul E. McKenney wrote: > > On Wed, Nov 14, 2018 at 12:20:13PM -0800, Paul E. McKenney wrote: > > > On Tue, Nov 13, 2018 at 07:10:37AM -0800, Paul E. McKenney wrote: > > > > On Tue, Nov 13, 20

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2019-04-15 Thread Ville Syrjälä
On Mon, Nov 26, 2018 at 02:01:22PM -0800, Paul E. McKenney wrote: > On Wed, Nov 14, 2018 at 12:20:13PM -0800, Paul E. McKenney wrote: > > On Tue, Nov 13, 2018 at 07:10:37AM -0800, Paul E. McKenney wrote: > > > On Tue, Nov 13, 2018 at 03:54:53PM +0200, Ville Syrjälä wrote: > > > > Hi Paul, > > > >

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2019-02-05 Thread tomli
> OK, thanks. This looks slightly different from the Loongson problem: > > - In Loongson, we don't get stuck in RCU, but in > cpufreq_dbs_governor_stop -> irq_work_sync(). > > - I run non-preemptible kernel, and my system still gets stuck. > > What is common is that it's UP with i8259 PIC. >

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2019-02-05 Thread Aaro Koskinen
Hi, On Tue, Feb 05, 2019 at 09:05:59PM +0800, Tom Li wrote: > On Tue, Feb 05, 2019 at 11:58:09AM +0200, Aaro Koskinen wrote: > > Can you try below fix? It works on my Loongson. > > Hello Aaro, thanks for your response. But in case you've missed > the original thread, please check it at: > > http

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2019-02-05 Thread Tom Li
On Tue, Feb 05, 2019 at 11:58:09AM +0200, Aaro Koskinen wrote: > Can you try below fix? It works on my Loongson. Hello Aaro, thanks for your response. But in case you've missed the original thread, please check it at: https://lkml.org/lkml/2018/11/13/857 My problem is NOT about how to fix the pr

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2019-02-05 Thread Aaro Koskinen
Hi, On Tue, Feb 05, 2019 at 01:07:00PM +0800, Tom Li wrote: > On Tue, Nov 13, 2018 at 03:54:53PM +0200, Ville Syrjälä wrote: > > Hi Paul, > > After 4.20-rc1 some of my 32bit UP machines no longer reboot/shutdown. > > I bisected this down to commit 45975c7d21a1 ("rcu: Define RCU-sched > > API in te

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2019-02-04 Thread Tom Li
On Tue, Nov 13, 2018 at 03:54:53PM +0200, Ville Syrjälä wrote: > Hi Paul, > After 4.20-rc1 some of my 32bit UP machines no longer reboot/shutdown. > I bisected this down to commit 45975c7d21a1 ("rcu: Define RCU-sched > API in terms of RCU for Tree RCU PREEMPT builds"). > > I traced the hang into >

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2018-11-26 Thread Paul E. McKenney
On Wed, Nov 14, 2018 at 12:20:13PM -0800, Paul E. McKenney wrote: > On Tue, Nov 13, 2018 at 07:10:37AM -0800, Paul E. McKenney wrote: > > On Tue, Nov 13, 2018 at 03:54:53PM +0200, Ville Syrjälä wrote: > > > Hi Paul, > > > > > > After 4.20-rc1 some of my 32bit UP machines no longer reboot/shutdown.

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2018-11-14 Thread Paul E. McKenney
On Tue, Nov 13, 2018 at 07:10:37AM -0800, Paul E. McKenney wrote: > On Tue, Nov 13, 2018 at 03:54:53PM +0200, Ville Syrjälä wrote: > > Hi Paul, > > > > After 4.20-rc1 some of my 32bit UP machines no longer reboot/shutdown. > > I bisected this down to commit 45975c7d21a1 ("rcu: Define RCU-sched > >

Re: [REGRESSION 4.20-rc1] 45975c7d21a1 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds")

2018-11-13 Thread Paul E. McKenney
On Tue, Nov 13, 2018 at 03:54:53PM +0200, Ville Syrjälä wrote: > Hi Paul, > > After 4.20-rc1 some of my 32bit UP machines no longer reboot/shutdown. > I bisected this down to commit 45975c7d21a1 ("rcu: Define RCU-sched > API in terms of RCU for Tree RCU PREEMPT builds"). > > I traced the hang int