[lldb] Print the exception traceback when hitting cleanup errors

[teemperor]

Summary

Right now if the test suite encounters a cleanup error it just prints "CLEANUP ERROR:" but not any additional information.

This patch just prints the exception that caused the cleanup error. This should make debugging the failing tests
for D83865 easier (and seems in general nice to have).

[labath]

sounds like a good idea

[JDevlieghere]

Can we pass the backtrace to the EventBuilder and set it as event["issue_backtrace"] like we do for event_for_job_test_add_error?

[teemperor]

• Rebase

[teemperor]

event_for_job_test_add_error was removed, so I'll go ahead and land this

lldb/packages/Python/lldbsuite/test/test_result.py

 """
 Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 See https://llvm.org/LICENSE.txt for license information.
 SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 Provides the LLDBTestResult class, which holds information about progress
 and results of a single test run.
 """
 
 # System modules
 import os
+import traceback
 
 # Third-party modules
 import unittest2
 
 # LLDB Modules
 from . import configuration
 from lldbsuite.test_event import build_exception
 
class LLDBTestResult(unittest2.TextTestResult):
 
     def addCleanupError(self, test, err):
         configuration.sdir_has_content = True
         super(LLDBTestResult, self).addCleanupError(test, err)
         method = getattr(test, "markCleanupError", None)
         if method:
             method()
         self.stream.write(
-            "CLEANUP ERROR: LLDB (%s) :: %s\n" %
-            (self._config_string(test), str(test)))
+            "CLEANUP ERROR: LLDB (%s) :: %s\n%s\n" %
+            (self._config_string(test), str(test), traceback.format_exc()))
 
     def addFailure(self, test, err):
         if (self.checkExclusion(
                 configuration.xfail_tests, test.id()) or
             self.checkCategoryExclusion(
                 configuration.xfail_categories, test)):
             self.addExpectedFailure(test, err, None)
             return