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Issues with feedback-2 when dropping context on compressor

To: Rohc <rohc@xxxxxxxxxxxxxxxxxxx>, "didier@xxxxxxxxxxx" <didier@xxxxxxxxxxx>
From: Yakir Matusovsky <yakir.matusovsky@xxxxxxxxxxx>
Date: Wed, 4 Mar 2020 22:49:39 +0000
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Thread-topic: Issues with feedback-2 when dropping context on compressor

Experiencing an issue with RoHC 2.1.x code over a radio link, where if IPv4 pinging across a near end to the far end, after a reboot on the near end the compressor receives a malformed feedback from a far end decomp and seems that it can’t reduce its compression state, used optimistic mode,

rohc_comp.c:3108 rohc_comp_feedback_parse_opts()] malformed FEEDBACK-2: packet too short for 6-byte option 15, o
rohc_comp_rfc3095.c:961 rohc_comp_rfc3095_feedback_2()] malformed FEEDBACK-2: failed to parse options
rohc_comp_rfc3095.c:903 rohc_comp_rfc3095_feedback()] failed to handle FEEDBACK-2
rohc_comp.c:2004 __rohc_comp_deliver_feedback()] failed to deliver feedback: failed to handle FEEDBACK-2
rohc_comp.c:2101 rohc_comp_deliver_feedback2()] failed to deliver feedback item #1
rohc_comp.c:3108 rohc_comp_feedback_parse_opts()] malformed FEEDBACK-2: packet too short for 9-byte option 4, on
rohc_comp_rfc3095.c:961 rohc_comp_rfc3095_feedback_2()] malformed FEEDBACK-2: failed to parse options
rohc_comp_rfc3095.c:903 rohc_comp_rfc3095_feedback()] failed to handle FEEDBACK-2
rohc_comp.c:2004 __rohc_comp_deliver_feedback()] failed to deliver feedback: failed to handle FEEDBACK-2
rohc_comp.c:2101 rohc_comp_deliver_feedback2()] failed to deliver feedback item #1
rohc_comp.c:3108 rohc_comp_feedback_parse_opts()] malformed FEEDBACK-2: packet too short for 9-byte option 4, on
rohc_comp_rfc3095.c:961 rohc_comp_rfc3095_feedback_2()] malformed FEEDBACK-2: failed to parse options
rohc_comp_rfc3095.c:903 rohc_comp_rfc3095_feedback()] failed to handle FEEDBACK-2
rohc_comp.c:2004 __rohc_comp_deliver_feedback()] failed to deliver feedback: failed to handle FEEDBACK-2
rohc_comp.c:2101 rohc_comp_deliver_feedback2()] failed to deliver feedback item #1
rohc_comp.c:3108 rohc_comp_feedback_parse_opts()] malformed FEEDBACK-2: packet too short for 9-byte option 4, on
rohc_comp_rfc3095.c:961 rohc_comp_rfc3095_feedback_2()] malformed FEEDBACK-2: failed to parse options
rohc_comp_rfc3095.c:903 rohc_comp_rfc3095_feedback()] failed to handle FEEDBACK-2
rohc_comp.c:2004 __rohc_comp_deliver_feedback()] failed to deliver feedback: failed to handle FEEDBACK-2
rohc_comp.c:2101 rohc_comp_deliver_feedback2()] failed to deliver feedback item #1

The ping is stuck.

The product is about to go on 2.3.1 in future, however, could this be resolved in the current version mentioned?

Regards
Yakir