On Thu, Jun 11, 2020 at 04:24:53PM +0800, Chen Yu wrote:
> Hi Peter,
> On Wed, Jun 10, 2020 at 5:52 PM Peter Zijlstra <pet...@infradead.org> wrote:
> >
> > On Wed, Jun 10, 2020 at 04:35:02PM +0800, kernel test robot wrote:
> > > Greeting,
> > >
> > > FYI, we noticed the following commit (built with gcc-9):
> > >
> > > commit: b2a02fc43a1f40ef4eb2fb2b06357382608d4d84 ("smp: Optimize
> > > send_call_function_single_ipi()")
> > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> > >
> > > in testcase: suspend-stress
> > > with following parameters:
> > >
> > > mode: freeze
> > > iterations: 10
> > >
> > >
> > >
> > > on test machine: 2 threads Broxton with 4G memory
> > >
> > > caused below changes (please refer to attached dmesg/kmsg for entire
> > > log/backtrace):
> > >
> > >
> > > If you fix the issue, kindly add following tag
> > > Reported-by: kernel test robot <rong.a.c...@intel.com>
> > >
> > >
> > > the result of this commit:
> > >
> > > test started
> >
> > No dmesg output? No splat?
> This issue was only found on one of the test machines from lkp team.
> I've borrowed that machine and will try to narrow down and give feedback
> later.
Thanks! One thing to maybe try is hotplug tests. Suspend does hotplugs,
and it might be easier to debug hotplug than it is to debug suspend.
