[test] Dump traceback on test-runner interrupts

Bug: v8:13113
Change-Id: I7cd37446d9ecbe271e0e5df96a4dcfd43b307c27
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3879489Reviewed-by: Alexander Schulze <alexschulze@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83056}

tools/testrunner/testproc/sigproc.py

@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import faulthandler
 import logging
 import signal
 
@@ -20,11 +21,15 @@ class SignalProc(base.TestProcObserver):
     logging.warning('Ctrl-C detected, early abort...')
     self.exit_code = utils.EXIT_CODE_INTERRUPTED
     self.stop()
+    if logging.getLogger().isEnabledFor(logging.INFO):
+      faulthandler.dump_traceback()
 
   def _on_sigterm(self, _signum, _stack_frame):
     logging.warning('SIGTERM received, early abort...')
     self.exit_code = utils.EXIT_CODE_TERMINATED
     self.stop()
+    if logging.getLogger().isEnabledFor(logging.INFO):
+      faulthandler.dump_traceback()
 
   def worst_exit_code(self, results):
     exit_code = results.exit_code()

tools/testrunner/testproc/timeout.py

@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import faulthandler
 import logging
 import time
 
@@ -34,3 +35,5 @@ class TimeoutProc(base.TestProcObserver):
       if time.time() - self._start > self._duration_sec:
         logging.info('Total timeout reached.')
         self.stop()
+        if logging.getLogger().isEnabledFor(logging.INFO):
+          faulthandler.dump_traceback()