Fix

app/controllers/projects/jobs_controller.rb

@@ -119,20 +119,22 @@ class Projects::JobsController < Projects::ApplicationController
   end
 
   def raw
-    build.trace.read do |stream|
     if trace_artifact_file
       send_upload(trace_artifact_file,
-          send_params: { type: 'text/plain; charset=utf-8', disposition: 'inline' },
-          redirect_params: { query: { 'response-content-type' => 'text/plain; charset=utf-8', 'response-content-disposition' => 'inline' } } )
-      elsif stream.file?
+                  send_params: raw_send_params,
+                  redirect_params: raw_redirect_params)
+    else
+      build.trace.read do |stream|
+        if stream.file?
           send_file stream.path, type: 'text/plain; charset=utf-8', disposition: 'inline'
         elsif build.old_trace
-        send_data stream.path, type: 'text/plain; charset=utf-8', disposition: 'inline', filename: 'job.log'
+          send_data stream.raw, type: 'text/plain; charset=utf-8', disposition: 'inline', filename: 'job.log'
         else
           render_404
         end
       end
     end
+  end
 
   private
 
@@ -144,6 +146,14 @@ class Projects::JobsController < Projects::ApplicationController
     return access_denied! unless can?(current_user, :erase_build, build)
   end
 
+  def raw_send_params
+    { type: 'text/plain; charset=utf-8', disposition: 'inline' }
+  end
+
+  def raw_redirect_params
+    { query: { 'response-content-type' => 'text/plain; charset=utf-8', 'response-content-disposition' => 'inline' } }
+  end
+
   def trace_artifact_file
     @trace_artifact_file ||= build.job_artifacts_trace&.file
   end

lib/gitlab/ci/trace/stream.rb

@@ -22,7 +22,7 @@ module Gitlab
         end
 
         def file?
-          self.path.present? if self.respond_to(:path)
+          self.path.present? if respond_to?(:path)
         end
 
         def limit(last_bytes = LIMIT_SIZE)