xds_end2end_test crash #25897
Description
I found this crash on xds_end2end_test
E0406 11:18:38.598187823 259 tls_security_connector.cc:572] Server BlockOnInitialCredentialHandshaker not supported yet.
E0406 11:18:38.601282991 259 server_auth_filter.cc:303] assertion failed: auth_context != nullptr
*** SIGABRT received at time=1617707918 on cpu 0 ***
PC: @ 0x7fcd1bee1428 (unknown) raise
@ 0x7fcd28bee59e 352 absl::lts_20210324::WriteFailureInfo()
@ 0x7fcd28becada 560 absl::lts_20210324::AbslFailureSignalHandler()
@ 0x5ed03c (unknown) SignalAction()
Aborted (core dumped)
I believe it happens when certificates have not been updated yet, resulting in a case where handshakers are not added for an incoming connection which would result in auth_context not being populated. The server_auth_filter currently assumes the auth_context to always be filled if the server uses credentials.