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must send and receive INFOMATION message when CHILD-SA was deleted.

RFC4306 1.4. says

                  Each endpoint MUST close its incoming SAs and allow the
   other endpoint to close the other SA in each pair.  To delete an SA,
   an INFORMATIONAL exchange with one or more delete payloads is sent
   listing the SPIs (as they would be expected in the headers of inbound
   packets) of the SAs to be deleted.

'ikectl reset sa' generates broken SADB_X_SPDDELETE if multiple CHILD-SA's negotiated.

Network:
[OpenBSD(Reference)] --- [NetBSD(DUT)]
192.168.87.10 192.168.87.11

Config:
OpenBSD:

ikev2 active esp \
     from 192.168.87.10 to 192.168.87.11 \
     peer 192.168.87.11 local 192.168.87.10 \
     ikesa enc 3des auth hmac-sha1 group modp1024 \
     childsa enc aes-128 auth hmac-sha1 \
     psk "foobar"

NetBSD:

ikev2 test-policy active esp \
     from 192.168.87.11 to 192.168.87.10 \
     peer 192.168.87.10 local 192.168.87.11 \
     ikesa enc 3des auth hmac-sha1 group modp1024 \
     childsa enc aes-128 auth hmac-sha1 \
     psk "foobar"

(1) Prepare

openbsd# iked

netbsd# iked -dvv

(waiting for 1st CHILD_SA established)

(2) Create more SA

openbsd# ikectl reset sa

XXX: openbsd doesn't send INFOMATION(DELETE SA)

(3) Reset SA

netbsd# ike reset sa

(4) the error

SADB_X_SPDDELETE: pfkey_reply message: Invalid argument
SADB_X_SPDDELETE: pfkey_reply message: Invalid argument

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