tor/changes/bug24665

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o Major bugfixes (KIST, scheduler):
- The KIST scheduler did not correctly account for data already enqueued
in each connection's send socket buffer, particularly in cases when the
TCP/IP congestion window was reduced between scheduler calls. This
situation lead to excessive per-connection buffering in the kernel, and
a potential memory DoS. Fixes bug 24665; bugfix on 0.3.2.1-alpha.