The error messages associated with the `0xfffffffb` context error in the `IOAcceleratorFamily2` kernel extension are "stream error found. token_id was 0x%04x token_size was 0x%04x", "unrecognized token id", and "unexpected token size". So they all have to do with "tokens", as described at bug 1713230 comment #3.
Bug 1738289 Comment 9 Edit History
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The error messages associated with the `0xfffffffb/-5` context error in the `IOAcceleratorFamily2` kernel extension are "stream error found. token_id was 0x%04x token_size was 0x%04x", "unrecognized token id", and "unexpected token size". So they all have to do with "tokens", as described at bug 1713230 comment #3.