The 9P monkey lets a failed write's op log a msg when another of its Twrites succeeded

A ctl line cut across Twrites runs a piece a Twrite: in seed 109, "Save Pl" ran Save and said so, and the next piece, "acem", was refused. one_failure_rule took the msg as the failed write's. It now flags a msg only when no Twrite of the op succeeded.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 5 insertions, 1 deletions

diff --git a/test/monkey9p.py b/test/monkey9p.py
index ee0b0ebc..7ab6cb0c 100644
--- a/test/monkey9p.py
+++ b/test/monkey9p.py
@@ -1514,7 +1514,11 @@ def one_failure_rule(ctx, res):
     if not lo <= len(errs) <= hi:
         return (f'{len(failed)} failed write(s) logged {len(errs)} err record(s) '
                 f'(allowed {lo}..{hi}); failed={[(w[0], w[1], w[3]) for w in failed]} window={res.window}')
-    if failed and msgs:
+    # A msg is a failed write's only when no Twrite of the op succeeded: a
+    # line cut across Twrites runs a piece a Twrite, and a piece that ran
+    # (a Save) says so while a later one is refused.
+    succeeded = [w for w in writes if w[2] is True and w[0] == 'write']
+    if failed and msgs and not succeeded:
         return f'a failed write also logged msg: {msgs}; failed={[(w[1], w[3]) for w in failed]}'
     return None