Track guessed as N from the test source. The ranker reads frontmatter, so an unset track parks a stub in Track T's queue regardless of what the body says -- correct the track: line if this is wrong.

This commit CANNOT be the cause. The job builds only with $(PXX_STABLE), and this commit moved no stable_linux_amd64/** — so the bytes that compiled it are unchanged. Look at flakiness or box load, not at the named sha; the bisect is unsound here and has been skipped.

origin/master has advanced 2 commit(s) since this sha. Re-verify at current HEAD before acting — the callback is tagged to the sha that was tested, which may no longer be the state of the tree.

regression: lib-test#src:test/lib_mimic_xml_etree_elementtree.npy red at 1b9b43e5b511 (auto-filed by twatch)

Type: regression (auto-filed by Track T watcher, host plexus). Untriaged.
Found: 2026-08-20T16:41:34Z
Test source: test/lib_mimic_xml_etree_elementtree.npy

Repro

tools/testmgr.py --tier full --job 'lib-test#src:test/lib_mimic_xml_etree_elementtree.npy' at 1b9b43e5b511d53e9fbe55f3366e6ce9158ee0b9

Range

bad 1b9b43e5b511, last good 57b9b7148d32, 132 commit(s) in range — the watcher narrows this by idle bisect; check tstate/TSTATE.md for the current range.

Log tail

note: xml_etree_elementtree -> mimic_xml_etree_elementtree (shim, subset)
ok: /tmp/testmgr-scratch-1432498/lib_mimic_xml_etree  [code=2543179B  data=60497B  bss=17852B  procs=1762]
Unhandled exception: TypeError: can only concatenate str (not "method") to str

Stub ticket: signal only. Track T agent (face 2) enriches or a dev track takes it from the repro line.

Log

2026-08-22 — auto-closed by the plexus watcher: lib-test#src:test/lib_mimic_xml_etree_elementtree.npy passes at 98ed38202254 (tier full); it was red at 1b9b43e5b511. Reopening is by a fresh NEW-RED stub, since a second red is a second finding with its own range.