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A managed model can declare companion artifacts (LongCat-Video-Avatar-1.5
pulls its tokenizer, text encoder and VAE from the separate LongCat-Video
base repo via a target: companion artifact). preloadOne resolves the whole
set in memory, but the binding written back to disk carried only the
primary: persistArtifactBinding marshalled []Spec{result.Spec} and replaced
the entire artifacts: list with it, silently dropping every companion.
In a single process the loss is invisible because the in-memory config keeps
the companion. It bites on the next controller restart: the config reloads
from the mangled file with the primary alone, so withCompanionArtifactOptions
finds no resolved companion and synthesizes no base_model option. The remote
longcat-video backend then never receives base_model, falls back to
BASE_MODEL_ID and downloads the repo itself ("Downloading required files for
meituan-longcat/LongCat-Video"), failing the load with "base_model must point
to a LongCat-Video checkpoint".
This is why an explicit base_model:<path> added to the config options works
where the managed companion does not: an explicit option lives in options:,
which is never rewritten, while the managed companion lives in artifacts:,
which the binding overwrote.
Persist the full resolved set (primary + every companion), and widen
bindingNeedsPersistence to compare the whole artifact list so a companion
resolving for the first time still triggers a write. The single-node path is
unaffected: there the in-memory config already carried the companion, and the
staging/ModelPath resolution for a remote worker (nested per-model staged
root, #10949) is unchanged and already correct once the option is generated.
Assisted-by: Claude Code:claude-opus-4-8[1m] [Read] [Edit] [Bash]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>