release notes entry for 0.2.1.26

ReleaseNotes

@@ -3,6 +3,48 @@ This document summarizes new features and bugfixes in each stable release
 of Tor. If you want to see more detailed descriptions of the changes in
 each development snapshot, see the ChangeLog file.
 
+Changes in version 0.2.1.26 - 2010-05-02
+  Tor 0.2.1.26 addresses the recent connection and memory overload
+  problems we've been seeing on relays, especially relays with their
+  DirPort open. If your relay has been crashing, or you turned it off
+  because it used too many resources, give this release a try.
+
+  This release also fixes yet another instance of broken OpenSSL libraries
+  that was causing some relays to drop out of the consensus.
+
+  o Major bugfixes:
+    - Teach relays to defend themselves from connection overload. Relays
+      now close idle circuits early if it looks like they were intended
+      for directory fetches. Relays are also more aggressive about closing
+      TLS connections that have no circuits on them. Such circuits are
+      unlikely to be re-used, and tens of thousands of them were piling
+      up at the fast relays, causing the relays to run out of sockets
+      and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
+      their directory fetches over TLS).
+    - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
+      that claim to be earlier than 0.9.8m, but which have in reality
+      backported huge swaths of 0.9.8m or 0.9.8n renegotiation
+      behavior. Possible fix for some cases of bug 1346.
+    - Directory mirrors were fetching relay descriptors only from v2
+      directory authorities, rather than v3 authorities like they should.
+      Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
+      to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
+
+  o Minor bugfixes:
+    - Finally get rid of the deprecated and now harmful notion of "clique
+      mode", where directory authorities maintain TLS connections to
+      every other relay.
+
+  o Testsuite fixes:
+    - In the util/threads test, no longer free the test_mutex before all
+      worker threads have finished. Bugfix on 0.2.1.6-alpha.
+    - The master thread could starve the worker threads quite badly on
+      certain systems, causing them to run only partially in the allowed
+      window. This resulted in test failures. Now the master thread sleeps
+      occasionally for a few microseconds while the two worker-threads
+      compete for the mutex. Bugfix on 0.2.0.1-alpha.
+
+
 Changes in version 0.2.1.25 - 2010-03-16
   Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
   prevent relays from guessing their IP address correctly. It also fixes