gitlab-ci/deqp: detect and report flakes

If there are a small number of fails, re-run to determine if they are
flakes, and optionally (if `$FLAKES_CHANNEL` configured) report the
flakes.

This way flakes don't interfere with developers working on other
drivers, but get logged so that the developers working on the flaking
driver can monitor the situation.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Eric Engestrom <eric.engestrom@intel.com>

.gitlab-ci.yml

@@ -461,7 +461,7 @@ scons-old-llvm:
     - tar -xf artifacts/install.tar
     - LD_LIBRARY_PATH=install/lib find install/lib -name "*.so" -print -exec ldd {} \;
   artifacts:
-    when: on_failure
+    when: always
     name: "$CI_JOB_NAME-$CI_COMMIT_REF_NAME"
     paths:
       - results/
@@ -555,6 +555,7 @@ arm64_a630_gles2:
     DEQP_SKIPS: deqp-freedreno-a630-skips.txt
     NIR_VALIDATE: 0
     DEQP_PARALLEL: 4
+    FLAKES_CHANNEL: "#freedreno-ci"
   tags:
     - mesa-cheza
   dependencies:

.gitlab-ci/container/arm_test.sh

@@ -26,6 +26,7 @@ apt-get -y install \
 	libvulkan-dev \
 	libvulkan1 \
 	meson \
+	netcat \
 	pkg-config \
 	procps \
 	python \

.gitlab-ci/deqp-runner.sh

@@ -57,15 +57,56 @@ fi
 
 set +e
 
-vulkan-cts-runner \
-    --deqp /deqp/modules/$DEQP_VER/deqp-$DEQP_VER \
-    --output $RESULTS/cts-runner-results.txt \
-    --caselist /tmp/case-list.txt \
-    --exclude-list $ARTIFACTS/$DEQP_SKIPS \
-    $XFAIL \
-    --job ${DEQP_PARALLEL:-1} \
-    -- \
-    "${DEQP_OPTIONS[@]}"
+run_cts() {
+    caselist=$1
+    output=$2
+    deqp-runner \
+        --deqp /deqp/modules/$DEQP_VER/deqp-$DEQP_VER \
+        --output $output \
+        --caselist $caselist \
+        --exclude-list $ARTIFACTS/$DEQP_SKIPS \
+        $XFAIL \
+        --job ${DEQP_PARALLEL:-1} \
+	--allow-flakes true \
+        -- \
+        "${DEQP_OPTIONS[@]}"
+}
+
+report_flakes() {
+    if [ -z "$FLAKES_CHANNEL" ]; then
+        return 0
+    fi
+    flakes=$1
+    bot="$CI_RUNNER_DESCRIPTION-$CI_PIPELINE_ID"
+    channel="$FLAKES_CHANNEL"
+    (
+    echo NICK $bot
+    echo USER $bot unused unused :Gitlab CI Notifier
+    sleep 10
+    echo "JOIN $channel"
+    sleep 1
+    desc="Flakes detected in job: $CI_JOB_URL on $CI_RUNNER_DESCRIPTION"
+    if [ -n "CI_MERGE_REQUEST_SOURCE_BRANCH_NAME" ]; then
+        desc="$desc on branch $CI_MERGE_REQUEST_SOURCE_BRANCH_NAME ($CI_MERGE_REQUEST_TITLE)"
+    fi
+    echo "PRIVMSG $channel :$desc"
+    for flake in `cat $flakes`; do
+        echo "PRIVMSG $channel :$flake"
+    done
+    echo "PRIVMSG $channel :See $CI_JOB_URL/artifacts/browse/results/"
+    echo "QUIT"
+    ) | nc irc.freenode.net 6667 > /dev/null
+
+}
+
+# wrapper to supress +x to avoid spamming the log
+quiet() {
+    set +x
+    "$@"
+    set -x
+}
+
+run_cts /tmp/case-list.txt $RESULTS/cts-runner-results.txt
 DEQP_EXITCODE=$?
 
 if [ $DEQP_EXITCODE -ne 0 ]; then
@@ -78,6 +119,28 @@ if [ $DEQP_EXITCODE -ne 0 ]; then
         grep -v ",ExpectedFail" > \
         $RESULTS/cts-runner-unexpected-results.txt
     head -n 50 $RESULTS/cts-runner-unexpected-results.txt
+
+    count=`cat $RESULTS/cts-runner-unexpected-results.txt | wc -l`
+
+    # Re-run fails to detect flakes.  But use a small threshold, if
+    # something was fundamentally broken, we don't want to re-run
+    # the entire caselist
+else
+    cat $RESULTS/cts-runner-results.txt | \
+        grep ",Flake" > \
+        $RESULTS/cts-runner-flakes.txt
+
+    count=`cat $RESULTS/cts-runner-flakes.txt | wc -l`
+    if [ $count -gt 0 ]; then
+        echo "Some flakes found (see cts-runner-flakes.txt in artifacts for full results):"
+        head -n 50 $RESULTS/cts-runner-flakes.txt
+
+        # Report the flakes to IRC channel for monitoring (if configured):
+        quiet report_flakes $RESULTS/cts-runner-flakes.txt
+    else
+        # no flakes, so clean-up:
+        rm $RESULTS/cts-runner-flakes.txt
+    fi
 fi
 
 exit $DEQP_EXITCODE