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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sat, 13 Feb 2010 10:34:50 +0000 (UTC)
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Subject: cvs commit: src/sys/ufs/ffs ffs_alloc.c
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kib         2010-02-13 10:34:50 UTC

  FreeBSD src repository

  Modified files:
    sys/ufs/ffs          ffs_alloc.c 
  Log:
  SVN rev 203818 on 2010-02-13 10:34:50Z by kib
  
  When ffs_realloccg() failed to allocate bigger fragment and, because
  pending blocks are scheduled for removal, goes to retry the (re)allocation,
  clear the bp pointer. It might happen that meantime free space is really
  exhausted and we are entering nospace: label without bread()ing buffer,
  causing stale bp value to be brelse()d again.
  
  Tested by:      pho
      (Producing a scenario to reliably reproduce the
       race appeared to be much harder then fixing the bug)
  MFC after:      1 week
  
  Revision  Changes    Path
  1.157     +3 -1      src/sys/ufs/ffs/ffs_alloc.c