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From: Mikolaj Golub <trociny@FreeBSD.org>
Date: Sun, 29 May 2011 18:00:50 +0000 (UTC)
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Subject: cvs commit: src/sys/kern uipc_socket.c
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trociny     2011-05-29 18:00:50 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             uipc_socket.c 
  Log:
  SVN rev 222454 on 2011-05-29 18:00:50Z by trociny
  
  In soreceive_generic(), if MSG_WAITALL is set but the request is
  larger than the receive buffer, we have to receive in sections.
  When notifying the protocol that some data has been drained the
  lock is released for a moment. Returning we block waiting for the
  rest of data. There is a race, when data could arrive while the
  lock was released and then the connection stalls in sbwait.
  
  Fix this by checking for data before blocking and skip blocking
  if there are some.
  
  PR:             kern/154504
  Reported by:    Andrey Simonenko <simon@comsys.ntu-kpi.kiev.ua>
  Tested by:      Andrey Simonenko <simon@comsys.ntu-kpi.kiev.ua>
  Reviewed by:    rwatson
  Approved by:    kib (co-mentor)
  MFC after:      2 weeks
  
  Revision  Changes    Path
  1.355     +10 -4     src/sys/kern/uipc_socket.c