See the log. Given that these tests fail due to data not being returned at all when it is expected, this doesn't feel like something we could just ignore.
Created attachment 737215 [details] memcached-1.6.10-build.log.xz
Created attachment 737218 [details] emerge --info
Sadly, the problem is still present in 1.6.14.
USE tests started on Sat May 21 12:14:52 -00 2022 FEATURES=' test' USE='' succeeded for =net-misc/memcached-1.6.15 USE='-sasl -seccomp -slabs-reassign -ssl' succeeded for =net-misc/memcached-1.6.15 USE='sasl -seccomp -slabs-reassign -ssl' succeeded for =net-misc/memcached-1.6.15 USE='-sasl seccomp -slabs-reassign -ssl' succeeded for =net-misc/memcached-1.6.15 USE='sasl seccomp -slabs-reassign -ssl' succeeded for =net-misc/memcached-1.6.15 USE='-sasl -seccomp slabs-reassign -ssl' succeeded for =net-misc/memcached-1.6.15 USE='sasl -seccomp slabs-reassign -ssl' succeeded for =net-misc/memcached-1.6.15 USE='-sasl seccomp slabs-reassign -ssl' succeeded for =net-misc/memcached-1.6.15 USE='-sasl -seccomp -slabs-reassign ssl' succeeded for =net-misc/memcached-1.6.15 USE='-sasl seccomp -slabs-reassign ssl' succeeded for =net-misc/memcached-1.6.15 USE='-sasl -seccomp slabs-reassign ssl' succeeded for =net-misc/memcached-1.6.15 USE='sasl -seccomp slabs-reassign ssl' succeeded for =net-misc/memcached-1.6.15 USE='sasl seccomp slabs-reassign ssl' succeeded for =net-misc/memcached-1.6.15
Created attachment 803197 [details] full build.log.xz net-misc/memcached has been tested on qemu virtual machine, and all tests passed. so I will try to go ahead and keyword it instead of blocking here forever, and for the test failure on unmatched board, I'd hope we can investigate later..
The error seems to be gone on the physical devices as well as of latest available versions in Gentoo, so I'll go ahead and close this report.