git: kernel - Fix deep recursion in vm_object_collapse()

Matthew Dillon dillon at
Wed Oct 26 18:59:57 PDT 2011

commit e806bedd2cb34ee45da81741e5a42c9263fca225
Author: Matthew Dillon <dillon at>
Date:   Wed Oct 26 18:56:39 2011 -0700

    kernel - Fix deep recursion in vm_object_collapse()
    * vm_object_collapse() will loop but its backing_object sometimes needs
      to be deallocated as well and this can trigger another collapse against
      a different parent object.
    * Introduce vm_object_dealloc_list and friends to collect a list of objects
      requiring deallocation so the caller can run the list in a way that avoids
      a deep recursion.
    Reported-by: juanfra

Summary of changes:
 sys/vm/vm_map.c    |    4 +-
 sys/vm/vm_object.c |  132 ++++++++++++++++++++++++++++++++++++++++++++--------
 sys/vm/vm_object.h |   11 ++++-
 3 files changed, 124 insertions(+), 23 deletions(-)

DragonFly BSD source repository

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