Could you try the workaround in:
https://bugs.launchpad.net/ubuntu/+source/samba/+bug/302092/comments/4
Is it a 8.04 box that was upgraded to 8.10 ? Did sudo start to fail as
soon as you upgraded, or did it start to fail some time after ?
** Changed in: samba (Ubuntu)
Status: New => Incomplete
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segfault in pam_smbpass.so
https://bugs.launchpad.net/bugs/303458
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