#7017 HIGH Never A: Read sharing can deadlock.

[Zarro Boogs per Child]

#7017: Read sharing can deadlock.
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 Reporter:  mstone         |       Owner:  rwh           
     Type:  defect         |      Status:  new           
 Priority:  high           |   Milestone:  Never Assigned
Component:  read-activity  |     Version:                
 Keywords:                 |    Verified:  0             
 Blocking:                 |   Blockedby:                
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 I olpc-update'd two B4s from 703 -> 704. Both have Read-44 installed and
 both are connected to a channel 1 XS Mesh with Salut running.

 I resumed a previously created Read instance containing Phyla.pdf which I
 shared publicly from MS2 and joined from MS1. I switched away to do other
 work, then came back to the Read instances to find them frozen with dark
 grey screens containing only the activity title text entry box. I ran
 'strace -p' on both Read pids and found that the two instances were
 deadlocked, both blocking in recv().

 How might this have occurred?

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Ticket URL: <http://dev.laptop.org/ticket/7017>
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