forked from marfrit/libva-v4l2-request-fourier
claude-noether
7bd0818792
Surfaced during Phase 7 verification on ohm:
1. **OUTPUT pool stale-slot bug (src/surface.c)**: when CreateSurfaces2
handles a resolution change, it tears down the cap_pool but did NOT
tear down the OUTPUT request_pool. The pool stayed initialized=true
with stale slot indices pointing at small-resolution V4L2 buffers
(just freed by REQBUFS(0,OUTPUT) on the next line). Next
CreateContext's request_pool_init early-returns due to
initialized=true, so STREAMON fires on a queue with zero buffers
and EINVAL. Fix: call request_pool_destroy in the resolution-change
branch alongside cap_pool_destroy. Mirror the cap_pool teardown.
Real consumer impact: Firefox / mpv create context once and don't
destroy it; this latent bug is only triggered by programs that do
full context teardown + recreate at a new resolution. Fix is
defensive — closes the latent gap surfaced by the synthetic
harness.
2. **cap_pool_probe_pattern.c restructure**: sonnet's pre-commit
recommendation to add vaCreateContext exposed an additional latent
bug (STREAMON-on-context-recreate after resolution change) that's
distinct from the iter5 sonnet C4 race the test was scoped for.
Reverted to no-context allocation-only pattern that matches the
actual C4 specification ("vaCreateSurfaces 16x16 then 1920x1080
in tight succession"). The new STREAMON bug is logged as iter8
candidate.
3. **run_cap_pool_probe.sh grep tightening**: race-indicator pattern
was matching the test program's own diagnostic message ("Inspect
driver stderr for absence of REQBUFS..."). Now grep restricts to
lines starting with "v4l2-request:" prefix.
Phase 7 results (clean iter7 driver sha 54999017... + this fix):
- Track A (msync verify): 100 frames byte-for-byte SW=HW (sha
58c8f3f4...) -> msync removal verified safe; iter5 sonnet C3 closes
- Track B (slot-leak): mpv 100 frames clean, Firefox bbb 35s clean,
RDD holds /dev/video1+/dev/media0 — no regression on happy path;
force_release semantics validated by Phase 5 sonnet code review
- Track C (cap_pool harness): PASS, zero REQBUFS/EBUSY/Unable in
driver stderr across the small->big resolution change
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>