lpstat consumes a complete CPU in cups 1.4.8

[Paul Conklin]

found one and logged STR #4233.  Please let me know if you need anything else or if i can kill off the PID since it's been humming along at 100% for 2 weeks :-)


> Reliably... no.  it's somewhat rare, but we also have over 500+ hosts running CUPS so it usually happens a couple times a month.  Very rarely do we touch the daemon.  I'm hoping to move to 1.6.x soon (as soon as i can get past my bug using custom filters) so this may be a moot issue if you think its possible it's been fixed upstream.
>
> > Paul,
> >
> > If you can reproduce reliably by running lpstat at the same time as sending SIGHUP to cupsd, please do file a bug with strace output for the affected PIDs.
> >
> > On 2012-11-20, at 12:16 AM, Paul Conklin <paul.conklin at cerner.com> wrote:
> >
> > >>> Weve notice lpstat consuming a full CPU occasionally.  Any ideas as to a cause or what we could look at?  its on RHEL 5.5 x86_64.
> > >>>
> > >>>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> > >>> 15692 d_p0165   25   0 98.9m 2472 1884 R 100.0  0.0   9397:25 lpstat
> > >>> 26241 d_p0165   25   0 98.0m 2464 1884 R 100.0  0.0   9408:05 lpstat
> > >>>
> > >> here are the corresponding pids at the os level
> > >>
> > >> d_p0165  15692 15667 99 Nov13 ?        6-12:59:43 lpstat -plp62
> > >> d_p0165  26241 26181 99 Nov13 ?        6-13:10:23 lpstat -ppahcass1
> > >>
> > > Looking through my notes for this time, and every other time this is happened, it appears it always seems to co-incide with a cups reload / restart.  should I file this as a bug for lpstat?  the last time there was a reload was on the 13th.  same date as the "zombie" lpstat's"
> > >
> > > grep reload /var/log/cups/error_log
> > >
> > > I [13/Nov/2012:10:08:12 -0500] Full reload is required.
> > > I [13/Nov/2012:10:08:12 -0500] Full reload complete.
> > > I [13/Nov/2012:10:53:22 -0500] Full reload is required.
> > > I [13/Nov/2012:10:53:22 -0500] Full reload complete.
> > > I [13/Nov/2012:11:04:02 -0500] Full reload is required.
> > > I [13/Nov/2012:11:04:02 -0500] Full reload complete.
> > >
> > >
> > >
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