[cups.general] lpstat consumes a complete CPU in cups 1.4.8

[Michael Sweet]

Now that we have log info, go ahead and kill the offending process. If we need more info we can probably just wait for it to happen again.


On 2012-11-20, at 5:54 PM, Paul Conklin <paul.conklin at cerner.com> wrote:

> 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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>>> 
>>> ________________________________________________________________________
>>> Michael Sweet, Senior Printing System Engineer, PWG Chair
>>> 
>> 
> 
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________________________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair