azureuser
fb0ae7436d
manager_set_dns_server() and dns_server_flush_cache() call dns_cache_flush() unconditionally, wiping the entire cache even when StaleRetentionSec is configured. This defeats serve-stale by discarding cached records that should remain available during server switches and feature-level re-probes. The original serve-stale commit (5ed91481ab) added a stale_retention_usec guard to link_set_dns_server(), and a later commit (7928c0e0a1) added the same guard to dns_delegate_set_dns_server(), but these two call sites in resolved-dns-server.c were missed. This is particularly visible with DNSOverTLS, where TLS handshake failures trigger frequent feature-level downgrades and re-probes via dns_server_flush_cache(), flushing the cache each time. Add the same stale_retention_usec guard to both call sites so that cache entries are allowed to expire naturally via dns_cache_prune() when serve-stale is enabled. Fixes: #40781 This commit was prepared with assistance from an AI coding agent (GitHub Copilot). All changes have been reviewed for correctness and adherence to the systemd coding style.
System and Service Manager
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