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Date: Fri, 26 Jun 2009 16:59:29 -0600 (MDT)
From: Barkley Vowk <bvowk@math.ualberta.ca>
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Subject: rpc.yppasswdd fails in 7.2?
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I've got a 7.2 box acting as NIS master, running rpc.yppasswdd. When 
remote users try to change their passwords they see:

testing1# passwd mytest
Changing NIS password for mytest
Old Password:
New Password:
Retype New Password:
passwd: pam_chauthtok(): error in service module

On the server I get this in the logs:
rpc.yppasswdd[36858]: pw_mkdb() failed

I tracked the error message down to line 620 of yppasswdd_server.c, which
lead me to libutil/pw_util.c.

It looks like waitpid in mk_pwdb is returning the error "No child 
processes", which then makes mk_pwdb return an error. But the child does 
run and do it's job as expected. If you edit yppasswdd_server.c to ignore 
the return value of mk_pwdb, passwords are changed as expected.