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For debugging purposes, unstable builds will sometimes intentionally panic for unexpected behaviours. We observed such a panic after loading a cached netmap, but because we had a valid cached map, the client was unable to recover on its own and the operator had to manually reset the cache. As a defensive hedge, when netmap caching is enabled, check for a panic during installation of a net network map: If one occurs, discard any cached netmaps before letting the panic unwind, so that we do not lose the panic itself, but reduce the need for manual intervention. Updates #12639 Updates tailscale/corp#27300 Change-Id: I0436889c6bdc2fa728c9cb83630cd7b00a72ce68 Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>