Yep, this is also what I discovered after reading the man page.

However, it does not fix the problem. After stopping NRPE and OMSA, deleting 
the semaphores, OMSA is no longer logging a segfault.
Instead, the dsm_sa_datamgrd and eventmgrd can not be started:

# /opt/dell/srvadmin/sbin/srvadmin-services.sh start
Starting Systems Management Device Drivers:
Starting dell_rbu:                                         [  OK  ]
Starting ipmi driver: 
Already started                                            [  OK  ]
Starting Systems Management Data Engine:
Starting dsm_sa_datamgrd:                                  [FAILED]
Starting dsm_sa_eventmgrd:                                 [FAILED]
Starting DSM SA Shared Services:                           [  OK  ]

This is the other behavior, I initially described.

Regards,
Stefan

> On Fri, 29 Apr 2016, Dietrich, Stefan wrote:
> 
>> The server is in production, so a reboot is at the moment not possible.
>> I will try to find a different, where I can debug the problem better.
> 
> Something like this to delete the nrpe semaphores will restore it to a working
> state.  A reboot is totally unnecessary.
> 
> for i in $(ipcs -s|grep nrpe|awk '{print $2}');do ipcrm -s $i;done
> 
> jh

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