Re: kworker with empty task->cpus_allowed (was Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host)

2017-07-04 Thread Eryu Guan
On Tue, Jul 04, 2017 at 09:06:55PM +1000, Michael Ellerman wrote: > Eryu Guan <eg...@redhat.com> writes: > > > On Tue, Jul 04, 2017 at 04:26:11PM +1000, Michael Ellerman wrote: > >> Eryu Guan <eg...@redhat.com> writes: > >> > On Fri, Jun 30, 201

Re: kworker with empty task->cpus_allowed (was Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host)

2017-07-04 Thread Eryu Guan
On Tue, Jul 04, 2017 at 04:26:11PM +1000, Michael Ellerman wrote: > Eryu Guan <eg...@redhat.com> writes: > > On Fri, Jun 30, 2017 at 08:07:02PM +1000, Michael Ellerman wrote: > >> > >> Can you try this patch and see if it changes anything? (with the debug > &

Re: kworker with empty task->cpus_allowed (was Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host)

2017-06-30 Thread Eryu Guan
On Fri, Jun 30, 2017 at 08:07:02PM +1000, Michael Ellerman wrote: > Eryu Guan <eg...@redhat.com> writes: > > > > I have to update the patch a bit to make it compile. > > Sure. > > >> + WARN_ON(cpumask_empty(worker->task->cpus_allowed)); >

Re: kworker with empty task->cpus_allowed (was Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host)

2017-06-29 Thread Eryu Guan
On Thu, Jun 29, 2017 at 10:06:31PM +1000, Michael Ellerman wrote: > Eryu Guan <eg...@redhat.com> writes: > > > On Thu, Jun 29, 2017 at 09:12:55PM +1000, Michael Ellerman wrote: > >> Eryu Guan <eg...@redhat.com> writes: > >> > >> > On Thu

Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host

2017-06-29 Thread Eryu Guan
On Thu, Jun 29, 2017 at 09:12:55PM +1000, Michael Ellerman wrote: > Eryu Guan <eg...@redhat.com> writes: > > > On Thu, Jun 29, 2017 at 06:47:50PM +1000, Balbir Singh wrote: > >> On Thu, Jun 29, 2017 at 1:41 PM, Eryu Guan <eg...@redhat.com> wrote: > >>

Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host

2017-06-29 Thread Eryu Guan
On Thu, Jun 29, 2017 at 08:27:11PM +1000, Michael Ellerman wrote: > Eryu Guan <eg...@redhat.com> writes: > > > Hi all, > > > > Li Wang and I are constantly seeing ppc64le hosts crashing due to bad > > page access. But it's not reproducing on every ppc64le h

Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host

2017-06-29 Thread Eryu Guan
On Thu, Jun 29, 2017 at 06:47:50PM +1000, Balbir Singh wrote: > On Thu, Jun 29, 2017 at 1:41 PM, Eryu Guan <eg...@redhat.com> wrote: > > On Thu, Jun 29, 2017 at 03:16:10AM +1000, Balbir Singh wrote: > >> On Wed, Jun 28, 2017 at 6:32 PM, Eryu Guan <eg...@redhat

Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host

2017-06-29 Thread Eryu Guan
On Thu, Jun 29, 2017 at 06:47:50PM +1000, Balbir Singh wrote: > On Thu, Jun 29, 2017 at 1:41 PM, Eryu Guan <eg...@redhat.com> wrote: > > On Thu, Jun 29, 2017 at 03:16:10AM +1000, Balbir Singh wrote: > >> On Wed, Jun 28, 2017 at 6:32 PM, Eryu Guan <eg...@redhat

Re: [v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host

2017-06-28 Thread Eryu Guan
On Thu, Jun 29, 2017 at 03:16:10AM +1000, Balbir Singh wrote: > On Wed, Jun 28, 2017 at 6:32 PM, Eryu Guan <eg...@redhat.com> wrote: > > Hi all, > > > > Li Wang and I are constantly seeing ppc64le hosts crashing due to bad > > page access. But it's not reprod

[v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host

2017-06-28 Thread Eryu Guan
Hi all, Li Wang and I are constantly seeing ppc64le hosts crashing due to bad page access. But it's not reproducing on every ppc64le host we've tested, but it usually happened in filesystem testings. [ 207.403459] Unable to handle kernel paging request for unaligned access at address