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 _cpu_up()

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: > >> > >> [ 40

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 hang

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 o

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 rena

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 se