BIND 10 #2636: stats crash

[BIND 10 Development]

#2636: stats crash
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            Reporter:  jreed         |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  statistics    |  Tasks
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  Core          |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by vorner):

 My guess is the following happened:
  * Something grew too large (I have no idea what).
  * The system started swapping. It swapped boss out.
  * The stats daemon asked boss for list of processes over the msgq (that's
 around the line 256 as indicated by the traceback)
  * The boss took too long to get out of swap and the stats timed out
 waiting for the answer.

 I don't think there's a reasonable workaround for this. But this could be
 solved by the upcoming (hopefully) msgq enhancements (auto-answering
 „undeliverable“, tracking responses in msgq and using asynchronous reads ‒
 then the timeout would be larger and if it happened, the msgq would just
 send an error response, so stats would just abort this poll and not
 crash).

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Ticket URL: <http://bind10.isc.org/ticket/2636#comment:1>
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