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MFC r266444:

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We have two functions from where a geom orphan method could be called:
  g_orphan_register and g_resize_provider_event. Both are called from the
  event queue. Also we have GEOM_DEV class, which does deferred destroy
  for its consumers via g_dev_destroy (also called from the event queue).
  So it is possible, that for some consumers an orphan method will be
  called twice. This triggers panic in g_dev_orphan.
  Check that consumer isn't already orphaned before call orphan method.
This commit is contained in:
ae 2014-06-02 10:14:03 +00:00
parent 7bdc535062
commit af0a9c5a59
1 changed files with 8 additions and 0 deletions
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8
sys/geom/geom_event.c
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@ -206,6 +206,14 @@ g_orphan_register(struct g_provider *pp)
KASSERT(cp->geom->orphan != NULL,
("geom %s has no orphan, class %s",
cp->geom->name, cp->geom->class->name));
/*
* XXX: g_dev_orphan method does deferred destroying
* and it is possible, that other event could already
* call the orphan method. Check consumer's flags to
* do not schedule it twice.
*/
if (cp->flags & G_CF_ORPHAN)
continue;
cp->flags |= G_CF_ORPHAN;
cp->geom->orphan(cp);
}