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A recent fix was introduced to ensure that a streamdesc instance won't be attached to an already completed QCS which is eligible to purging. This was performed by skipping application protocol decoding if a QCS is in such a state. Here is the patch responsible for this change. caf60ac696a29799631a76beb16d0072f65eef12 BUG/MEDIUM: mux-quic: do not attach on already closed stream However, this is too restrictive, in particular for unidirection stream where no streamdesc is never attached. To fix this behavior, first qcs_attach_sc() API has been modified. Instead of returning a streamdesc instance, it returns either 0 on success or a negative error code. There should be no functional changes with this patch. It is only to be able to extend qcs_attach_sc() with the possibility of skipping streamdesc instantiation while still keeping a success return value. This should be backported wherever the above patch has been merged. For the record, it was scheduled for immediate backport on 3.1, plus merging on older releases up to 2.8 after a period of observation.