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SubjectRe: [sched] 9ae606bc74: WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_stats_print[rcutorture]
On Mon, Jul 25, 2022 at 04:12:57PM +0800, kernel test robot wrote:
>
>
> Greeting,
>
> FYI, we noticed the following commit (built with clang-15):
>
> commit: 9ae606bc74dd0e58d4de894e3c5cbb9d45599267 ("sched: Introduce task_cpu_possible_mask() to limit fallback rq selection")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
> in testcase: rcutorture
> version:
> with following parameters:
>
> runtime: 300s
> test: cpuhotplug
> torture_type: trivial
>
> test-description: rcutorture is rcutorture kernel module load/unload test.
> test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt
>
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +-------------------------------------------------------------------------+------------+------------+
> | | 304000390f | 9ae606bc74 |
> +-------------------------------------------------------------------------+------------+------------+
> | WARNING:at_kernel/rcu/rcutorture.c:#synchronize_rcu_trivial[rcutorture] | 120 | 120 |
> | RIP:synchronize_rcu_trivial[rcutorture] | 120 | 120 |
> | WARNING:at_kernel/rcu/update.c:#rcutorture_sched_setaffinity | 120 | 120 |
> | RIP:rcutorture_sched_setaffinity | 120 | 120 |
> | WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_stats_print[rcutorture] | 0 | 36 |
> | RIP:rcu_torture_stats_print[rcutorture] | 0 | 36 |
> +-------------------------------------------------------------------------+------------+------------+
>
>
> please be noted, since 9ae606bc74 is kind of old, we also tested on a latest
> mainline commit:
> commit 515f71412bb73ebd7f41f90e1684fc80b8730789
> Merge: 301c8949322fe cf5029d5dd7cb
> Author: Linus Torvalds <torvalds@linux-foundation.org>
> Date: Sat Jul 23 10:22:26 2022 -0700
>
> and confirmed the
> WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_stats_print[rcutorture]
> still exists.

I'm not convinced by the bisection -- that commit should't have any effect
on x86.

Will

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