p5a: fix a deadlock in the given TestFetchIf (lock held across a request); run notes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-25 21:45:57 -07:00
parent cfde35397a
commit 7fa5bd21b2
2 changed files with 11 additions and 4 deletions
@@ -43,4 +43,10 @@ reaches orion until the owner's review, the merge, and straylight's pin bump.

 ## Changes during the run

-(none yet)
+- 2026-09-25, task 01: **owner test fault.** `TestFetchIf` took its mutex with `defer mu.Unlock()`
+  and then made a third request, whose server handler needs that mutex: a deadlock that surfaced as
+  a 20 s upstream timeout. Ornith spent 55 minutes debugging it correctly (its notes had the
+  handler blocked on `mu.Lock` at the test line) and ended on a refused `/tmp` read, with the
+  implementation done but debug prints in `pdf.go` and a `zz_debug_test.go`. Owner fixed the test
+  (copy the slice under the lock, release before the next request), removed the debug scaffolding,
+  and resumed the session to finish and commit.