linux-kernel - Re: [PATCH v3 3/3] drm/ci: enable lockdep detection

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Message-ID: <CAPW4XYZ-yinJovLJDCPoriOLyV-q2V7JdFktkiAZK7Uwh8zmVg@mail.gmail.com>
Date: Wed, 26 Feb 2025 17:24:08 -0300
From: Helen Mae Koike Fornazier <helen.fornazier@...il.com>
To: Vignesh Raman <vignesh.raman@...labora.com>
Cc: dri-devel@...ts.freedesktop.org, daniels@...labora.com, airlied@...il.com, 
	simona.vetter@...ll.ch, robdclark@...il.com, guilherme.gallo@...labora.com, 
	sergi.blanch.torne@...labora.com, valentine.burley@...labora.com, 
	jani.nikula@...ux.intel.com, dmitry.baryshkov@...aro.org, mripard@...nel.org, 
	boqun.feng@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] drm/ci: enable lockdep detection

Em seg., 17 de fev. de 2025 às 02:37, Vignesh Raman
<vignesh.raman@...labora.com> escreveu:
>
> We have enabled PROVE_LOCKING (which enables LOCKDEP) in drm-ci.
> This will output warnings when kernel locking errors are encountered
> and will continue executing tests. To detect if lockdep has been
> triggered, check the debug_locks value in /proc/lockdep_stats after
> the tests have run. When debug_locks is 0, it indicates that lockdep
> has detected issues and turned itself off. Check this value, and if
> lockdep is detected, exit with an error and configure it as a warning
> in GitLab CI.
>
> GitLab CI ignores exit codes other than 1 by default. Pass the correct
> exit code with variable FF_USE_NEW_BASH_EVAL_STRATEGY set to true or
> exit on failure.
>
> Also update the documentation.
>
> Signed-off-by: Vignesh Raman <vignesh.raman@...labora.com>

Acked-by: Helen Koike <helen.fornazier@...il.com>

> ---
>
> v2:
>   - Lockdep failures are reported as pipeline warnings,
>     and the documentation is updated.
>
> v3:
>   - Add a common job for exit code handling and extend it in other jobs.
>
> ---
>  Documentation/gpu/automated_testing.rst |  4 ++++
>  drivers/gpu/drm/ci/igt_runner.sh        | 11 +++++++++++
>  drivers/gpu/drm/ci/test.yml             | 17 ++++++++++++++---
>  3 files changed, 29 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/gpu/automated_testing.rst b/Documentation/gpu/automated_testing.rst
> index 6d7c6086034d..62aa3ede02a5 100644
> --- a/Documentation/gpu/automated_testing.rst
> +++ b/Documentation/gpu/automated_testing.rst
> @@ -115,6 +115,10 @@ created (eg. https://gitlab.freedesktop.org/janedoe/linux/-/pipelines)
>  5. The various jobs will be run and when the pipeline is finished, all jobs
>  should be green unless a regression has been found.
>
> +6. Warnings in the pipeline indicate that lockdep
> +(see Documentation/locking/lockdep-design.rst) issues have been detected
> +during the tests.
> +
>
>  How to update test expectations
>  ===============================
> diff --git a/drivers/gpu/drm/ci/igt_runner.sh b/drivers/gpu/drm/ci/igt_runner.sh
> index 68b042e43b7f..2a0599f12c58 100755
> --- a/drivers/gpu/drm/ci/igt_runner.sh
> +++ b/drivers/gpu/drm/ci/igt_runner.sh
> @@ -85,5 +85,16 @@ deqp-runner junit \
>     --limit 50 \
>     --template "See $ARTIFACTS_BASE_URL/results/{{testcase}}.xml"
>
> +# Check if /proc/lockdep_stats exists
> +if [ -f /proc/lockdep_stats ]; then
> +    # If debug_locks is 0, it indicates lockdep is detected and it turns itself off.
> +    debug_locks=$(grep 'debug_locks:' /proc/lockdep_stats | awk '{print $2}')
> +    if [ "$debug_locks" -eq 0 ] && [ "$ret" -eq 0 ]; then
> +        echo "Warning: LOCKDEP issue detected. Please check dmesg logs for more information."
> +        cat /proc/lockdep_stats
> +        ret=101
> +    fi
> +fi
> +
>  cd $oldpath
>  exit $ret
> diff --git a/drivers/gpu/drm/ci/test.yml b/drivers/gpu/drm/ci/test.yml
> index 0eab020a33b9..dbc4ff50d8ff 100644
> --- a/drivers/gpu/drm/ci/test.yml
> +++ b/drivers/gpu/drm/ci/test.yml
> @@ -1,6 +1,14 @@
> +.allow_failure_lockdep:
> +  variables:
> +    FF_USE_NEW_BASH_EVAL_STRATEGY: 'true'
> +  allow_failure:
> +    exit_codes:
> +      - 101
> +
>  .lava-test:
>    extends:
>      - .container+build-rules
> +    - .allow_failure_lockdep
>    timeout: "1h30m"
>    rules:
>      - !reference [.scheduled_pipeline-rules, rules]
> @@ -69,6 +77,7 @@
>    extends:
>      - .baremetal-test-arm64
>      - .use-debian/baremetal_arm64_test
> +    - .allow_failure_lockdep
>    timeout: "1h30m"
>    rules:
>      - !reference [.scheduled_pipeline-rules, rules]
> @@ -91,6 +100,8 @@
>
>  .software-driver:
>    stage: software-driver
> +  extends:
> +    - .allow_failure_lockdep
>    timeout: "1h30m"
>    rules:
>      - !reference [.scheduled_pipeline-rules, rules]
> @@ -153,7 +164,7 @@ msm:apq8016:
>      BM_KERNEL_EXTRA_ARGS: clk_ignore_unused
>      RUNNER_TAG: google-freedreno-db410c
>    script:
> -    - ./install/bare-metal/fastboot.sh
> +    - ./install/bare-metal/fastboot.sh || exit $?
>
>  msm:apq8096:
>    extends:
> @@ -167,7 +178,7 @@ msm:apq8096:
>      GPU_VERSION: apq8096
>      RUNNER_TAG: google-freedreno-db820c
>    script:
> -    - ./install/bare-metal/fastboot.sh
> +    - ./install/bare-metal/fastboot.sh || exit $?
>
>  msm:sdm845:
>    extends:
> @@ -181,7 +192,7 @@ msm:sdm845:
>      GPU_VERSION: sdm845
>      RUNNER_TAG: google-freedreno-cheza
>    script:
> -    - ./install/bare-metal/cros-servo.sh
> +    - ./install/bare-metal/cros-servo.sh || exit $?
>
>  msm:sm8350-hdk:
>    extends:
> --
> 2.43.0
>


-- 
Helen Koike