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From: Neel Natu <neel@FreeBSD.org>
Date: Wed, 10 Feb 2010 05:43:31 +0000 (UTC)
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Subject: cvs commit: src/sys/mips/mips exception.S
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neel        2010-02-10 05:43:31 UTC

  FreeBSD src repository

  Modified files:
    sys/mips/mips        exception.S 
  Log:
  SVN rev 203743 on 2010-02-10 05:43:31Z by neel
  
  Enable interrupts before doing AST processing to avoid a deadlock.
  
  Specifically on an SMP kernel it was observed that if both the
  processors are doing an exit1() via ast()->postsig()->sigexit()
  then we will deadlock.
  
  This happens because exit1() calls vmspace_exit() that in turn
  calls pmap_invalidate_all(). This function tries to do a
  smp_rendezvous() which blocks because the other processor is not
  responding to IPIs - because it too is doing AST processing with
  interrupts disabled.
  
  Revision  Changes    Path
  1.7       +12 -0     src/sys/mips/mips/exception.S