forward-port the 0.3.2.4-alpha changelog.

ChangeLog

+Changes in version 0.3.2.4-alpha - 2017-11-08
+  Tor 0.3.2.4-alpha is the fourth alpha release in the 0.3.2.x series.
+  It fixes several stability and reliability bugs, especially including
+  a major reliability issue that has been plaguing fast exit relays in
+  recent months.
+
+  o Major bugfixes (exit relays, DNS):
+    - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
+      making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
+      0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
+      identifying and finding a workaround to this bug and to Moritz,
+      Arthur Edelstein, and Roger for helping to track it down and
+      analyze it.
+
+  o Major bugfixes (scheduler, channel):
+    - Stop processing scheduled channels if they closed while flushing
+      cells. This can happen if the write on the connection fails
+      leading to the channel being closed while in the scheduler loop.
+      Fixes bug 23751; bugfix on 0.3.2.1-alpha.
+
+  o Minor features (logging, scheduler):
+    - Introduce a SCHED_BUG() function to log extra information about
+      the scheduler state if we ever catch a bug in the scheduler.
+      Closes ticket 23753.
+
+  o Minor features (removed deprecations):
+    - The ClientDNSRejectInternalAddresses flag can once again be set in
+      non-testing Tor networks, so long as they do not use the default
+      directory authorities. This change also removes the deprecation of
+      this flag from 0.2.9.2-alpha. Closes ticket 21031.
+
+  o Minor features (testing):
+    - Our fuzzing tests now test the encrypted portions of v3 onion
+      service descriptors. Implements more of 21509.
+
+  o Minor bugfixes (directory client):
+    - On failure to download directory information, delay retry attempts
+      by a random amount based on the "decorrelated jitter" algorithm.
+      Our previous delay algorithm tended to produce extra-long delays
+      too easily. Fixes bug 23816; bugfix on 0.2.9.1-alpha.
+
+  o Minor bugfixes (IPv6, v3 single onion services):
+    - Remove buggy code for IPv6-only v3 single onion services, and
+      reject attempts to configure them. This release supports IPv4,
+      dual-stack, and IPv6-only v3 onion services; and IPv4 and dual-
+      stack v3 single onion services. Fixes bug 23820; bugfix
+      on 0.3.2.1-alpha.
+
+  o Minor bugfixes (logging, relay):
+    - Give only a protocol warning when the ed25519 key is not
+      consistent between the descriptor and microdescriptor of a relay.
+      This can happen, for instance, if the relay has been flagged
+      NoEdConsensus. Fixes bug 24025; bugfix on 0.3.2.1-alpha.
+
+  o Minor bugfixes (manpage, onion service):
+    - Document that the HiddenServiceNumIntroductionPoints option is
+      0-10 for v2 services and 0-20 for v3 services. Fixes bug 24115;
+      bugfix on 0.3.2.1-alpha.
+
+  o Minor bugfixes (memory leaks):
+    - Fix a minor memory leak at exit in the KIST scheduler. This bug
+      should have no user-visible impact. Fixes bug 23774; bugfix
+      on 0.3.2.1-alpha.
+    - Fix a memory leak when decrypting a badly formatted v3 onion
+      service descriptor. Fixes bug 24150; bugfix on 0.3.2.1-alpha.
+      Found by OSS-Fuzz; this is OSS-Fuzz issue 3994.
+
+  o Minor bugfixes (onion services):
+    - Cache some needed onion service client information instead of
+      constantly computing it over and over again. Fixes bug 23623;
+      bugfix on 0.3.2.1-alpha.
+    - Properly retry HSv3 descriptor fetches when missing required
+      directory information. Fixes bug 23762; bugfix on 0.3.2.1-alpha.
+
+  o Minor bugfixes (path selection):
+    - When selecting relays by bandwidth, avoid a rounding error that
+      could sometimes cause load to be imbalanced incorrectly.
+      Previously, we would always round upwards; now, we round towards
+      the nearest integer. This had the biggest effect when a relay's
+      weight adjustments should have given it weight 0, but it got
+      weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
+    - When calculating the fraction of nodes that have descriptors, and
+      all nodes in the network have zero bandwidths, count the number of
+      nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
+    - Actually log the total bandwidth in compute_weighted_bandwidths().
+      Fixes bug 24170; bugfix on 0.2.4.3-alpha.
+
+  o Minor bugfixes (relay, crash):
+    - Avoid a crash when transitioning from client mode to bridge mode.
+      Previously, we would launch the worker threads whenever our
+      "public server" mode changed, but not when our "server" mode
+      changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
+
+  o Minor bugfixes (testing):
+    - Fix a spurious fuzzing-only use of an uninitialized value. Found
+      by Brian Carpenter. Fixes bug 24082; bugfix on 0.3.0.3-alpha.
+    - Test that IPv6-only clients can use microdescriptors when running
+      "make test-network-all". Requires chutney master 61c28b9 or later.
+      Closes ticket 24109.
+
+
 Changes in version 0.3.2.3-alpha - 2017-10-27
   Tor 0.3.2.3-alpha is the third release in the 0.3.2 series. It fixes
   numerous small bugs in earlier versions of 0.3.2.x, and adds a new