strange nagios main process

[Andreas Ericsson]

Christophe Yayon wrote:
> Hi all,
> 
> i am upgrading our nagios 1.2 (on freebsd 5.3-release) to nagios 2.0
> (currently last cvs after 2.0b3) on Freebsd-5.4RC2 and i saw a very
> strange thing.
> 
> After few hours, nagios main process (nagios -d ...) use lot of cpu time
> and when i do a truss on the pid (like a strace on linux), i have a
> 'kse_release' loop message.
> 
> 
> 
> # top
> last pid: 75729;  load averages:  1.81,  2.08,  2.03
> 63 processes:  2 running, 61 sleeping
> CPU states: 12.5% user,  0.0% nice, 16.0% system,  0.0% interrupt, 71.5% idle
> Mem: 36M Active, 1639M Inact, 219M Wired, 68M Cache, 112M Buf, 44M Free
> Swap: 5000M Total, 52K Used, 5000M Free
> 
>   PID USERNAME PRI NICE   SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
> 40435 nagios   112    0  4688K  3544K CPU0   0 569:46 93.99% 93.99% nagios
> [...]
> 
> 
> # truss -p 40435
> kse_release(0xbfbf9b70)                          ERR#22 'Invalid argument'
> kse_release(0xbfbf9b70)                          ERR#22 'Invalid argument'
> kse_release(0xbfbf9b70)                          ERR#22 'Invalid argument'
> [...]
> 
> What does it means ? i know that there are some issue with pthreads on
> FreeBSD, but is it the same problem ?
> 

Most likely. Without having a great deal of knowledge about BSD and 
threads, I'd say kse_release attempts to release a mutex or a futex that 
isn't locked. mutexes and futexes are spinlocked, so this sort of thing 
is to be expected behaviour with buggy implementations of pthreads.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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