Re: [linus:master] [mm/damon/sysfs] 9a5aa3349b: kernel-selftests.damon.damos_quota_goal.py.fail

[SeongJae Park]

Hello,

On Mon, 17 Feb 2025 15:01:23 +0800 kernel test robot <oliver.sang@xxxxxxxxx> wrote:

> 
> 
> Hello,
> 
> kernel test robot noticed "kernel-selftests.damon.damos_quota_goal.py.fail" on:
> 
> commit: 9a5aa3349b9428ae451b22c331d0d9a9cfc7ac90 ("mm/damon/sysfs: use damon_call() for update_schemes_effective_quotas")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> [test failed on linus/master      0ad2507d5d93f39619fc42372c347d6006b64319]
> [test failed on linux-next/master 0ae0fa3bf0b44c8611d114a9f69985bf451010c3]
> 
> in testcase: kernel-selftests
> version: kernel-selftests-x86_64-7ff71e6d9239-1_20250215
> with following parameters:
> 
> 	group: damon
> 
> 
> 
> config: x86_64-dcg_x86_64_defconfig-kselftests
> compiler: gcc-12
> test machine: 36 threads 1 sockets Intel(R) Core(TM) i9-10980XE CPU @ 3.00GHz (Cascade Lake) with 32G memory
> 
> (please refer to attached dmesg/kmsg for entire log/backtrace)
> 
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-lkp/202502171423.b28a918d-lkp@xxxxxxxxx
> 
> 
> 
> # timeout set to 300
> # selftests: damon: damos_quota_goal.py
> # score: 0, effective quota: 0 -> 16 (-1.000x)
> # score: 15000, effective quota: 16 -> 1 (0.062x)
> # score: 5000, effective quota: 1 -> 5 (5.000x)
> # score: 18000, effective quota: 1 -> 1 (1.000x)
> # efective bytes not changed: 1
> not ok 7 selftests: damon: damos_quota_goal.py # exit=1

Thank you for this report!  I just posted a fix[1] for this case.  Please refer
to the patch for details including the root cause.

[1] https://lore.kernel.org/20250217182304.45215-1-sj@xxxxxxxxxx


Thanks,
SJ

> 
> 
> 
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20250217/202502171423.b28a918d-lkp@xxxxxxxxx
> 
> 
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki