Re: [PATCH 5.7 000/243] 5.7.10-rc2 review

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Jul 21, 2020 at 02:59:22PM +0530, Naresh Kamboju wrote:
> On Tue, 21 Jul 2020 at 00:46, Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> >
> > This is the start of the stable review cycle for the 5.7.10 release.
> > There are 243 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Wed, 22 Jul 2020 19:14:36 +0000.
> > Anything received after that time might be too late.
> >
> > The whole patch series can be found in one patch at:
> >         https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.7.10-rc2.gz
> > or in the git tree and branch at:
> >         git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.7.y
> > and the diffstat can be found below.
> >
> > thanks,
> >
> > greg k-h
> 
> Results from Linaro’s test farm.
> Regressions detected on arm and arm64 (Juno-r2)
> We are bisecting this problem and get back to you soon.
> 
> perf test cases failed
>   perf:
>     * Track-with-sched_switch
>     * perf_record_test
>     * perf_report_test
> 
> Bad case:
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.002 MB perf-lava-test.data ]
> 
> when it was pass it prints number of samples like below,
> Good case:
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.004 MB perf-lava-test.data (46 samples) ]
> 
> steps to reproduce:
> # perf record -e cycles -o perf-lava-test.data ls -a  2>&1 | tee perf-record.log
> 
> Link to full test:
> https://qa-reports.linaro.org/lkft/linux-stable-rc-5.7-oe/build/v5.7.9-244-g7d2e5723ce4a/testrun/2969482/suite/perf/test/perf_record_test/log
> 
> test case:
> https://github.com/Linaro/test-definitions/blob/master/automated/linux/perf/perf.sh

Any hint by bisection as to what this problem is caused by?

thanks,

greg k-h