[tor-bugs] #2190 [Tor Client]: Possible reentrant calls to libevent from libevent logging callback

Mon Nov 15 16:06:15 UTC 2010

#2190: Possible reentrant calls to libevent from libevent logging callback
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 Reporter:  nickm       |       Owner:  nickm             
     Type:  defect      |      Status:  new               
 Priority:  normal      |   Milestone:  Tor: 0.2.2.x-final
Component:  Tor Client  |     Version:                    
 Keywords:              |      Parent:                    
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Comment(by nickm):

 The obvious easy fix is to never send log messages that arrive from
 libevent to any callback-based log backend.

 There is a harder fix: we could have a fix where instead of blocking
 libevent->controller log messages, we queue them in a list somewhere, and
 add a callback to play them back later.  This is probably a good idea for
 0.2.3 (and maybe 0.2.2) since it is not so great to keep controller users
 from seeing warnings.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2190#comment:1>
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