Re: powerpc 5.10-rcN boot failures with RCU_SCALE_TEST=m

2020-12-04 Thread Uladzislau Rezki
On Thu, Dec 03, 2020 at 03:34:45PM +0100, Uladzislau Rezki wrote: > On Thu, Dec 03, 2020 at 05:22:20PM +1100, Michael Ellerman wrote: > > Uladzislau Rezki writes: > > > On Thu, Dec 03, 2020 at 01:03:32AM +1100, Michael Ellerman wrote: > > ... > > >> > > >> The SMP bringup stalls because

Re: powerpc 5.10-rcN boot failures with RCU_SCALE_TEST=m

2020-12-03 Thread Uladzislau Rezki
On Thu, Dec 03, 2020 at 05:22:20PM +1100, Michael Ellerman wrote: > Uladzislau Rezki writes: > > On Thu, Dec 03, 2020 at 01:03:32AM +1100, Michael Ellerman wrote: > ... > >> > >> The SMP bringup stalls because _cpu_up() is blocked trying to take > >> cpu_hotplug_lock for writing: > >> > >> [

Re: powerpc 5.10-rcN boot failures with RCU_SCALE_TEST=m

2020-12-02 Thread Michael Ellerman
Uladzislau Rezki writes: > On Thu, Dec 03, 2020 at 01:03:32AM +1100, Michael Ellerman wrote: ... >> >> The SMP bringup stalls because _cpu_up() is blocked trying to take >> cpu_hotplug_lock for writing: >> >> [ 401.403132][T0] task:swapper/0 state:D stack:12512 pid:1 >> ppid:

Re: powerpc 5.10-rcN boot failures with RCU_SCALE_TEST=m

2020-12-02 Thread Uladzislau Rezki
On Thu, Dec 03, 2020 at 01:03:32AM +1100, Michael Ellerman wrote: > Daniel Axtens writes: > > Hi all, > > > > I'm having some difficulty tracking down a bug. > > > > Some configurations of the powerpc kernel since somewhere in the 5.10 > > merge window fail to boot on some ppc64 systems. They

Re: powerpc 5.10-rcN boot failures with RCU_SCALE_TEST=m

2020-12-02 Thread Michael Ellerman
Daniel Axtens writes: > Hi all, > > I'm having some difficulty tracking down a bug. > > Some configurations of the powerpc kernel since somewhere in the 5.10 > merge window fail to boot on some ppc64 systems. They hang while trying > to bring up SMP. It seems to depend on the RCU_SCALE/PERF_TEST

Re: powerpc 5.10-rcN boot failures with RCU_SCALE_TEST=m

2020-11-27 Thread Uladzislau Rezki
> Hi all, > > I'm having some difficulty tracking down a bug. > > Some configurations of the powerpc kernel since somewhere in the 5.10 > merge window fail to boot on some ppc64 systems. They hang while trying > to bring up SMP. It seems to depend on the RCU_SCALE/PERF_TEST option. > (It was

Re: powerpc 5.10-rcN boot failures with RCU_SCALE_TEST=m

2020-11-27 Thread Paul E. McKenney
On Fri, Nov 27, 2020 at 01:02:29PM +1100, Daniel Axtens wrote: > Hi all, > > I'm having some difficulty tracking down a bug. > > Some configurations of the powerpc kernel since somewhere in the 5.10 > merge window fail to boot on some ppc64 systems. They hang while trying > to bring up SMP. It

powerpc 5.10-rcN boot failures with RCU_SCALE_TEST=m

2020-11-26 Thread Daniel Axtens
Hi all, I'm having some difficulty tracking down a bug. Some configurations of the powerpc kernel since somewhere in the 5.10 merge window fail to boot on some ppc64 systems. They hang while trying to bring up SMP. It seems to depend on the RCU_SCALE/PERF_TEST option. (It was renamed in the 5.10