(CC'd tor-relays, please direct replies to tor-dev.)

Hi,

If you are running Tor master, your Tor may exit with a required protocol error.

The issue was introduced in commit 991bec67ee (about 8 hours ago).

The following conditions will make Tor exit: * Tor will exit on startup if it has a cached consensus from the 14th of September (or earlier). It does not matter how old the consensus is. * If certain directory authorities go down, the remaining authorities may generate a consensus that will cause your Tor to exit.

These consensuses require the LinkAuth=1 protocol, which Tor master believes it does not support. (The change was intended for NSS Tors, but mistakenly applies to all Tors.)

Here's how you can mitigate this issue: * downgrade to 0.3.4.8 or earlier, or * delete the cached consensuses in your data directory. These consensuses may be called cached-consensus, cached-microdesc-consensus, unverified-consensus, and unverified-microdesc-consensus. Some may not be present.

We should resolve this issue in master in the next 24 hours. Then it may take another 24 hours for packages to be rebuilt.

The master ticket for this change is: https://trac.torproject.org/projects/tor/ticket/27288

T

-- teor

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