Package: at
Version: 3.1.10.1
Followup-For: Bug #469868

It looks like a change introduced with kernel 2.6.24.

atd starts as root, but the main loop runs as effective userid "daemon".

at runs setuid "daemon".

Kernel behaviour seems to have changed to deny a process running as one 
(real or effective) userid being able to signal a process running as 
that same effective userid but a different real userid.

You can confirm this by running "kill -1 `cat /var/run/atd.pid`" as root 
and under "su daemon".



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