Re: panic: vm_object_shadow: source object has OBJ_ONEMAPPING set.

[Alan Cox]

On Sat, Apr 15, 2000 at 06:12:22PM -0400, Brian Fundakowski Feldman wrote:
> On Sat, 15 Apr 2000, Matthew Dillon wrote:
> 
> >     Note that the ref_count == 1 test in the vm_object_shadow optimization
> >     should be left intact.  This optimization requires a much stricter set
> >     of tests because we do not want to assume sharability of an object
> >     if someone else (the 'else' being 'someone unknown to us') has a reference
> >     on it, even if OBJ_ONEMAPPING is set.
> 
> The KASSERT is broken in another way, BTW: it has undefined (read:
> panic before the test even occurs) results if source is NULL, which
> vm_object_shadow otherwise handles.  I don't know why it's never been
> tripped on, though...
> 

Other parts of the VM insure that we never try to create
a shadow object for a non-existant backing object.

Alan


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