As in the original bug, I've got the same issue on RHEL5: cifs.upcall is not called when, mounting with cred=krb5, there is already an open connection to the same server by a different user. Do you have plans to backport the fix to RHEL5? Involved components: samba3x-client-3.5.10-0.109.el5_8 kernel-2.6.18-308.el5
After updating to samba3x-client-3.6.6-0.129.el5, the cruid option is supported by mount.cifs but still it is not recognized by the kernel (2.6.18-348.6.1.el5).
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