Prevent root-owned files in execd active_job spool area

[markdixon]

The new cgroup/cpuset code uses a couple of routines for switching effective uid/gid which appear to be causing some problems.

Some of the side symptoms include the following files in the execd spool sometimes being owned by root:

active_jobs/<JID>.<TASK>/config
active_jobs/<JID>.<TASK>/environment
active_jobs/<JID>.<TASK>/pe_hostfile
active_jobs/<JID>.<TASK>/<NUM>.<HOST>/

That last entry is a directory created for a SLAVE task. It being root-owned can cause jobs to fail with a "can't open pid file" error message.

The execd appears to have the correct euid/egid when entering the cgroup code, so I have removed the offending function calls. I don't know if there's a good reason for them that I've not noticed in limited testing.

Potential patch attached.

Cheers,

Mark
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Mark Dixon Email : m.c.dixon@…
HPC/Grid Systems Support Tel (int): 35429
Information Systems Services Tel (ext): +44(0)113 343 5429
University of Leeds, LS2 9JT, UK

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0001-Prevent-root-owned-files-in-execd-active_job-spool-a.patch​

[markdixon]

Added by email2trac

[dlove]

Fixed by [4640]