I think i should put my experience in a proprietary PAM-Kerberos module and the way i found a bug. The implementation way, the credential files are destroyed results in deletion of credentials of some other session done by same user. ie. it deletes the credential obtained by doing a kinit command in some other session. First I looked at OpenSSH code to find the cause of prolem and later it navigated to the PAM module. Its really cool and interesting.
The new year celebrations went away nicely. Back to work. Hope this year will be more adventurous.