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From: Sean Nicholas Barkas <snb@FreeBSD.org>
Date: Thu, 25 Jun 2009 20:40:13 +0000 (UTC)
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Subject: cvs commit: src/sys/ufs/ufs ufs_dirhash.c
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snb         2009-06-25 20:40:13 UTC

  FreeBSD src repository

  Modified files:
    sys/ufs/ufs          ufs_dirhash.c 
  Log:
  SVN rev 195003 on 2009-06-25 20:40:13Z by snb
  
  Fix a bug reported by pho@ where one can induce a panic by decreasing
  vfs.ufs.dirhash_maxmem below the current amount of memory used by dirhash. When
  ufsdirhash_build() is called with the memory in use greater than dirhash_maxmem,
  it attempts to free up memory by calling ufsdirhash_recycle(). If successful in
  freeing enough memory, ufsdirhash_recycle() leaves the dirhash list locked. But
  at this point in ufsdirhash_build(), the list is not explicitly unlocked after
  the call(s) to ufsdirhash_recycle(). When we next attempt to lock the dirhash
  list, we will get a "panic: _mtx_lock_sleep: recursed on non-recursive mutex
  dirhash list".
  
  Tested by:      pho
  Approved by:    dwmalone (mentor)
  MFC after:      3 weeks
  
  Revision  Changes    Path
  1.33      +4 -1      src/sys/ufs/ufs/ufs_dirhash.c