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Diffstat (limited to 'AGENTS.md')
| -rw-r--r-- | AGENTS.md | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -402,6 +402,20 @@ changing that component. The ones that generalise: is not a function`, which shows only in `qs log`; a Repeater bound to it simply builds nothing. Use `reduce((a, x) => a.concat(...), [])`. Seen with the assistant page's cloud Prefer rows (2026-10-23). +- **Canvas `createImageData` breaks Qt's garbage collector for good.** Qt + 6.11 subtracts the pixel buffer from the V4 engine's unmanaged-heap counter + without ever having added it, so the first GC after one is created wraps + the `size_t` counter below zero, and from then on every JS allocation runs + a full GC: a core pinned, keybinds and the drawer lagging, until a + restart. Reproduced in Qt's own `qml` tool with nothing but a `Canvas` + (17,856 of 17,856 GCs wrapped; the same canvas drawing with `fillRect`, 0 + of 5). The volume OSD's grain did it on every show, which is why the + desktop shell spun after volume keys, track changes and resumes alike. + `QV4_GC_TIMELIMIT=0`, set earlier for a misdiagnosed "stuck incremental + GC", does not help. Never use `createImageData`, `getImageData` or + `putImageData`. Found by running each always-on unit in its own `qs` with + `--log-rules qt.qml.gc.allocatorStats.debug=true` and reading the + unmanaged counter after each GC. - **A `Socket` whose connect failed never retries.** Quickshell 0.3.1 keeps the failed `QLocalSocket`, so setting `connected = true` again (or toggling it, or changing `path`) is a no-op: `setConnected` only connects when no |