Merge branch '2021-10-14-assorted-updates'

- Update to LLVM-13 in CI, assorted PCI fixes and pytest in CI
  improvements

1 files changed, 15 insertions, 0 deletions

diff --git a/doc/develop/py_testing.rst b/doc/develop/py_testing.rst
index 4f1e1f66e76..06f919609b5 100644
--- a/doc/develop/py_testing.rst
+++ b/doc/develop/py_testing.rst
@@ -103,6 +103,21 @@ will be written to `${build_dir}/test-log.html`. This is best viewed in a web
 browser, but may be read directly as plain text, perhaps with the aid of the
 `html2text` utility.
 
+If sandbox crashes (e.g. with a segfault) you will see message like this::
+
+
+    test/py/u_boot_spawn.py:171: in expect
+        c = os.read(self.fd, 1024).decode(errors='replace')
+    E   ValueError: U-Boot exited with signal 11 (Signals.SIGSEGV)
+
+
+Controlling output
+~~~~~~~~~~~~~~~~~~
+
+By default a short backtrace is reported. If you would like a longer one,
+pass ``--tb=long`` when running the test. See the pytest documentation for
+more options.
+
 Running tests in parallel
 ~~~~~~~~~~~~~~~~~~~~~~~~~