Fix runner eternal loop when update job result

Add spec

Add changelog

app/models/ci/build.rb

@@ -224,8 +224,15 @@ module Ci
 
       before_transition any => [:failed] do |build|
         next unless build.project
+        next unless build.deployment
 
-        build.deployment&.drop
+        begin
+          build.deployment.drop!
+        rescue => e
+          Gitlab::Sentry.track_exception(e, extra: { build_id: build.id })
+        end
+
+        true
       end
 
       after_transition any => [:failed] do |build|

changelogs/unreleased/fix-runner-eternal-loop-when-update-job-result.yml

+---
+title: Fix runner eternal loop when update job result
+merge_request: 24481
+author:
+type: fixed

spec/models/ci/build_spec.rb

@@ -3028,6 +3028,24 @@ describe Ci::Build do
         subject.drop!
       end
     end
+
+    context 'when associated deployment failed to update its status' do
+      let(:build) { create(:ci_build, :running, pipeline: pipeline) }
+      let!(:deployment) { create(:deployment, deployable: build) }
+
+      before do
+        allow_any_instance_of(Deployment)
+          .to receive(:drop!).and_raise('Unexpected error')
+      end
+
+      it 'can drop the build' do
+        expect(Gitlab::Sentry).to receive(:track_exception)
+
+        expect { build.drop! }.not_to raise_error
+
+        expect(build).to be_failed
+      end
+    end
   end
 
   describe '.matches_tag_ids' do