A progress timeout can occur before the child consumes all supplied
input. On Python 3.12, retrying communicate() without input stops
scheduling writes to stdin. The child waits for EOF while the driver
keeps waiting for output, which can hang the analyzer script tests
until the CI job timeout.
Run communicate() once in an I/O worker while the main thread waits
for its result and updates progress. On interruption, stop the owned
process group before joining the worker so blocked pipes cannot
prevent cleanup.
Make the regression wait for two progress updates before reading stdin
to force the pending-input case. Bound the entire child with an alarm
so a regression reports a failure instead of hanging the suite.
Validation: reproduce both check modes failing on Python 3.12.14
before the fix; all 75 lint-test fixtures pass on chesnokov-vm2
afterwards. All 11 process/log fixtures also pass locally on Python
3.14.8.
Fixes: c8648f9410 ("scripts: Share analyzer process and raw-log handling")
Provide common process, progress and report helpers for the upcoming
analyzer drivers. Preserve raw output bytes and command failure statuses,
keep progress separate from captured diagnostics, and terminate the owned
process group when an invocation is interrupted.
Forward valid inherited Make jobserver pipes without taking their tokens.
Document named-log truncation explicitly: a later run replaces that named
report unless the caller requests preservation.
Import the process and terminal fixtures and add raw-log coverage. No
analyzer-specific filtering or diagnostic exclusions are introduced.
Gleb Chesnokov