[MacPorts] #15906: "port -d upgrade apr" fails with internal error

[MacPorts]

#15906: "port -d upgrade apr" fails with internal error
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  Reporter:  stephen at xemacs.org  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  defect              |      Status:  new                                  
  Priority:  Normal              |   Milestone:  MacPorts base bugs                   
 Component:  base                |     Version:  1.7.0                                
Resolution:                      |    Keywords:                                       
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Comment (by dluke at macports.org):

 Looks like there was possibly something 'interesting' happening with your
 machine:

 "couldn't fork child process: resource temporarily unavailable"

 (ie. too many processes, not enough file descriptors available ... )

 Are you able to consistently reproduce this?

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Ticket URL: <http://trac.macports.org/ticket/15906#comment:1>
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