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SubjectRe: [rcu] 758cf1496b: BUG:spinlock_bad_magic_on_CPU
hi Paul,

On Wed, Mar 16, 2022 at 10:04:37AM -0700, Paul E. McKenney wrote:
> On Wed, Mar 16, 2022 at 02:16:28PM +0800, Oliver Sang wrote:
> > hi, Paul,
> >
> > On Mon, Mar 14, 2022 at 07:06:53AM -0700, Paul E. McKenney wrote:
> > > On Mon, Mar 14, 2022 at 01:50:57PM +0800, kernel test robot wrote:
> > > >
> > > >
> > > > Greeting,
> > > >
> > > > FYI, we noticed the following commit (built with gcc-9):
> > > >
> > > > commit: 758cf1496b94442c47c339b10d80cbaadf613425 ("rcu: Make UP-vacuous normal grace period advance sequence")
> > > > https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev.2022.03.09a
> > > >
> > > > in testcase: boot
> > > >
> > > > on test machine: qemu-system-x86_64 -enable-kvm -cpu Icelake-Server -smp 4 -m 16G
> > > >
> > > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> > > >
> > > >
> > > > +--------------------------------------+------------+------------+
> > > > | | 6129c2b2dc | 758cf1496b |
> > > > +--------------------------------------+------------+------------+
> > > > | BUG:spinlock_bad_magic_on_CPU | 0 | 16 |
> > > > | WARNING:at_init/main.c:#start_kernel | 0 | 16 |
> > > > | RIP:start_kernel | 0 | 16 |
> > > > +--------------------------------------+------------+------------+
> > > >
> > > >
> > > > If you fix the issue, kindly add following tag
> > > > Reported-by: kernel test robot <oliver.sang@intel.com>
> > >
> > > Does this fix it for you?
> > >
> > > 67792d475181 ("fixup! rcu: Make UP-vacuous normal grace period advance sequence")
> >
> > yes, this fixed:
> >
> > 6129c2b2dc65abde 758cf1496b94442c47c339b10d8 67792d4751810a675c5690ce2e9
> > ---------------- --------------------------- ---------------------------
> > fail:runs %reproduction fail:runs %reproduction fail:runs
> > | | | | |
> > :6 100% 6:6 0% :20 dmesg.BUG:spinlock_bad_magic_on_CPU
> > :6 100% 6:6 0% :20 dmesg.RIP:start_kernel
> > :6 100% 6:6 0% :20 dmesg.WARNING:at_init/main.c:#start_kernel
>
> Very good, thank you!
>
> May I add your Tested-by?

sure! our great pleasure :)

Tested-by: kernel test robot <oliver.sang@intel.com>

>
> Thanx, Paul
>

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