alc 2006-07-17 06:45:03 UTC
FreeBSD src repository
Modified files:
sys/vm vm_object.c
Log:
Ensure that vm_object_deallocate() doesn't dereference a stale object
pointer: When vm_object_deallocate() sleeps because of a non-zero
paging in progress count on either object or object's shadow,
vm_object_deallocate() must ensure that object is still the shadow's
backing object when it reawakens. In fact, object may have been
deallocated while vm_object_deallocate() slept. If so, reacquiring
the lock on object can lead to a deadlock.
Submitted by: ups@
MFC after: 3 weeks
Revision Changes Path
1.360 +13 -6 src/sys/vm/vm_object.c
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