Dear Maintainer, this crash on key generation when running adb for the first time seems now fixed in current buster/testing, version 1:8.1.0+r23-3. The patches adb_libssl_*.diff seem to have been dropped.
This issue is still visible in current stretch version 1:7.0.0+r33-1. The duplicate candidate bug 859195 got closed already some days ago, 858764 was tagged unreproducible, 903939 is unchanged. Kind regards, Bernhard