I encountered this bug today.  For me, the problem was the
/var/lib/secrets.tdb file.  It appears that a portion of the file was
clobbered by some log messages:

^...@^@^...@ltdb: tdb((null)): tdb_open_ex: could not open file 
/var/lib/samba/group_mapping.ldb: Permission denied
Unable to open tdb '/var/lib/samba/group_mapping.ldb'
Failed to connect to '/var/lib/samba/group_mapping.ldb'
ltdb: tdb((null)): tdb_open_ex: could not open file 
/var/lib/samba/group_mapping.ldb: Permission denied
Unable to open tdb '/var/lib/samba/group_mapping.ldb'
Failed to connect to '/var/lib/samba/group_mapping.ldb'
ltdb: tdb((null)): tdb_open_ex: could not open file 
/var/lib/samba/group_mapping.ldb: Permission denied
Unable to open tdb '/var/lib/samba/group_mapping.ldb'
Failed to connect to '/var/lib/samba/group_mapping.ldb'
ltdb: tdb((null)): tdb_open_ex: could not open file 
/var/lib/samba/group_mapping.ldb: Permission denied
Unable to open tdb '/var/lib/samba/group_mapping.ldb'
Failed to connect to '/var/lib/samba/group_mapping.ldb'

It's primarily a binary file, so I was surprised to discover this.
After (re)moving the file, everything was peachy.  Perhaps some output
in a script is being redirected improperly somewhere?

-- 
segfault in pam_smbpass.so
https://bugs.launchpad.net/bugs/303458
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