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 This commmit has since been replaced by this one, which should fix this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>
=========================================================================================
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
