Gerrit server lockups in SSH handlers

Affected Version: 2.1.8 (and presumably also 2.2.2)

What steps will reproduce the problem?
1. Run a Jenkins server with a gerrit-trigger plugin installed.
2. Within 30 mins, gerrit has deadlocked and will no longer respond to ssh 
commands (web interface is still fine)

What is the expected output? What do you see instead?
http://code.google.com/p/gerrit/source/detail?r=d6296556c6838754477d972e2fbbc222
7a2bbb33 introduced a deadlock when the SSH connection is terminated while the 
SSH command is still in progress.

Please provide any additional information below.
This thread has a discussion about it (and stack traces from Java showing the 
deadlock):
http://groups.google.com/group/repo-discuss/browse_thread/thread/ba180ecf165f972
6

Original issue reported on code.google.com by goo...@garyksmith.co.uk on 2 Feb 2012 at 1:32

CandyShop / gerrit

Gerrit server lockups in SSH handlers #1249