On Fri, May 26, 2023 at 03:59:48PM +0800, Yujie Liu wrote:
> Hi Paul,
>
> On Thu, May 25, 2023 at 09:45:11AM -0700, Paul E. McKenney wrote:
> > On Thu, May 25, 2023 at 01:37:13AM +0800, kernel test robot wrote:
> > > Hello,
> > >
> > > kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on:
> > >
> > > commit: 812195e4f70ef0e9fc68127355c553c537749546 ("rcuscale: Measure grace-period kthread CPU time")
> > > https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2023.05.20a
> > >
> > > in testcase: boot
> > >
> > > compiler: clang-14
> > > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
> > >
> > > (please refer to attached dmesg/kmsg for entire log/backtrace)
> > >
> > >
> > > +---------------------------------------------+------------+------------+
> > > | | 2393139b67 | 812195e4f7 |
> > > +---------------------------------------------+------------+------------+
> > > | boot_successes | 8 | 0 |
> > > | boot_failures | 0 | 8 |
> > > | BUG:kernel_NULL_pointer_dereference,address | 0 | 8 |
> > > | Oops:#[##] | 0 | 8 |
> > > | Kernel_panic-not_syncing:Fatal_exception | 0 | 8 |
> > > +---------------------------------------------+------------+------------+
> > >
> > >
> > > If you fix the issue, kindly add following tag
> > > | Reported-by: kernel test robot <yujie.liu@xxxxxxxxx>
> > > | Closes: https://lore.kernel.org/oe-lkp/202305241757.57c30887-yujie.liu@xxxxxxxxx
> >
> > This commmit has since been replaced by this one, which should fix this
> > problem:
> >
> > 60901dadfadc ("rcuscale: Measure grace-period kthread CPU time")
> >
> > Please let me know if the problem still exists with that commit.
>
> The problem is gone on commit 60901dadfadc. Thanks.
>
> Tested-by: Yujie Liu <yujie.liu@xxxxxxxxx>
And thank you again for your testing efforts!
Thanx, Paul
> =========================================================================================
> compiler/kconfig/rootfs/sleep/tbox_group/testcase:
> clang-14/x86_64-randconfig-a015-20230522/debian-11.1-i386-20220923.cgz/300/vm-snb/boot
>
> commit:
> 812195e4f70e ("rcuscale: Measure grace-period kthread CPU time") <-- old commit from dev.2023.05.20a branch
> 60901dadfadc ("rcuscale: Measure grace-period kthread CPU time") <-- new commit from rcu/next branch
>
> 812195e4f70ef0e9 60901dadfadcc152ae5cad7ebae
> ---------------- ---------------------------
> fail:runs %reproduction fail:runs
> | | |
> 6:6 -100% :7 dmesg.BUG:kernel_NULL_pointer_dereference,address
> 6:6 -100% :7 dmesg.Kernel_panic-not_syncing:Fatal_exception
> 6:6 -100% :7 dmesg.Oops:#[##]
> 6:6 -100% :7 dmesg.boot_failures
>
> --
> Best Regards,
> Yujie
>
