I eventually tracked this down to a sendmail/NIS interaction, by running
trace on the sendmail processes.
My co-worker had put some line such as:
Dummy:*:::PhD Students::
into the NIS password file.
While Sendmail was reading the NIS password database it hung, complaining
of a lack of bufferspace and logging 'sendmail: [1310] :locked' to syslog.
The solution is to remove the 'Dummy' lines from the NIS password file, and
all is well again.
Dummy sums it up really.
+--------------------------------------------------------------------+
| Andrew Mellanby | Tel : +44-1224-272750 |
| Computing Officer | Fax : +44-1224-272607 |
| Department of Mathematical Sciences | Email: mel@maths.abdn.ac.uk |
| Edward Wright Building | |
| University of Aberdeen, | |
| Aberdeen, Scotland, AB9 2TY | |
+--------------------------------------------------------------------+
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