We'll want the same patch for samba3x, but there might be some differences that'll mean we'll need to respin this. Taking this for now to verify the patch there and then I'll reassign to GD.
Reassigning to gd for him to commit the patch to samba3x. Thanks, GD!
The patch in comment #2 should make cifs.upcall virtually identical to the one proposed for the samba package (bug 517195).
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
http://rhn.redhat.com/errata/RHBA-2010-0301.html