Re: Intermittent Cron Errors

["Pierre A. Humblet" <Pierre dot Humblet at ieee dot org>]

> At 07:17 PM 7/8/2009, Rajiv Garg wrote:
>
> Compiled and ran -- here's the output:
>
> $>/tmp/testcron.exe
> name orderworker uid 11130 gid 10513
> 0
> 256
> 512
> 768
> 1024
> 1280
> 1536
> 1792
> 2048
> 2304
> 2560
>
> I killed it at this point.  No initgroups() or setuid() failures in 
> 2500 tries.  Let me know your thoughts.

I am baffled. The log starts on 3/18. There were no incidents until 
4/17, then 5/8 (3x) but since 5/11 they happen several times a day. 
On 6/22 at 05:05:01 and 06/23 at 23:03:11 two jobs were started at 
the same time and both failed.

So my hunch is still that it's a problem with a PDC connection, but I 
can't explain the exact sequence. After all if the call to initgroups 
fails, the groups of the daemon will be inherited by the job and that 
should not cause a setuid failure. On the other hand if setuid tries 
to create a token when the uid doesn't change, it must be a group issue.

If you end up bypassing the call to setuid when the uids match, 
please log the non-zero return value of initgroups (in the interest 
of science).
You can look at the cron events by typing "cronevents" in a shell.
Let me know if you need more help.

Pierre 


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