NRPE oddities

[rob.moss at uk.bnpparibas.com]

nagios-users-bounces at lists.sourceforge.net wrote on 12/10/2006 21:27:59:

> I'm running NRPE 2.5.1 on a number of machines and occasionally I'll
> see the processes get stuck just spinning their wheels.  It ends
> utilizing the CPU heavily and needs to be killed.  I haven't been able
> to track down what is causing this, so I wanted to ask if anyone on
> this list has seen this behavior before.  Also, I've seen that NRPE
> 2.5.2 fixes "a number of bugs" but do not know if it addresses this
> specifically.  I've included output from top and truss below.
> 
> top:
>   PID USERNAME THR PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
>  20950 nagios     1  20    0 3792K 1688K run     78.6H 49.58% nrpe
>  20675 nagios     1  20    0 3792K 1720K run     79.0H 48.62% nrpe
> 
> truss:
> getpid()                                        = 20675 [1]
> time()                                          = 1160684094
> getpid()                                        = 20675 [1]
> read(8, 0x00050FF8, 5)                          Err#11 EAGAIN
> getpid()                                        = 20675 [1]
> time()                                          = 1160684094
> getpid()                                        = 20675 [1]
> read(8, 0x00050FF8, 5)                          Err#11 EAGAIN
> getpid()                                        = 20675 [1]
> time()                                          = 1160684094
> getpid()                                        = 20675 [1]
> read(8, 0x00050FF8, 5)                          Err#11 EAGAIN
> getpid()                                        = 20675 [1]
> time()                                          = 1160684094
> getpid()                                        = 20675 [1]
> read(8, 0x00050FF8, 5)                          Err#11 EAGAIN
> getpid()                                        = 20675 [1]
> time()                                          = 1160684094
> getpid()                                        = 20675 [1]
> read(8, 0x00050FF8, 5)                          Err#11 EAGAIN
> getpid()                                        = 20675 [1]

Hi,
   I don't have any firm answers for you, but I have seen similar 
wierdness in NRPE on Solaris 8 and 10 when it's compiled with lots of 
optimisation flags:  -O2 -funroll-loops  etc..

My only recommendation would be to recompile the same source without 
running configure again (make clean; vi Makefile; make), but remove all 
optimisation flags and install just the new nrpe binary on one of the 
affected servers..

If you're still having problems, please go back through the truss and tell 
me where the open() call reads the file/socket which returns filehandle 8 
and paste in some more info

Other things to try: If you're compiling 64bit, try 32bit.. If you have an 
older version of OpenSSL than 0.9.8b, try updating.. If you have an older 
GCC 3.x than 3.3 or 3.4 then try updating..

Cheers
rob/mossko


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