xfs trace in 4.4.2 / also in 4.3.3 WARNING fs/xfs/xfs_aops.c:1232 xfs_vm_releasepage

[Stefan Priebe - Profihost AG]

Am 24.03.2016 um 09:10 schrieb Stefan Priebe - Profihost AG:
> 
> Am 23.03.2016 um 15:07 schrieb Brian Foster:
>> On Wed, Mar 23, 2016 at 02:28:03PM +0100, Stefan Priebe - Profihost AG wrote:
>>> sorry new one the last one got mangled. Comments inside.
>>>
>>> Am 05.03.2016 um 23:48 schrieb Dave Chinner:
>>>> On Fri, Mar 04, 2016 at 04:03:42PM -0500, Brian Foster wrote:
>>>>> On Fri, Mar 04, 2016 at 09:02:06PM +0100, Stefan Priebe wrote:
>>>>>> Am 04.03.2016 um 20:13 schrieb Brian Foster:
>>>>>>> On Fri, Mar 04, 2016 at 07:47:16PM +0100, Stefan Priebe wrote:
>>>>>>>> Am 20.02.2016 um 19:02 schrieb Stefan Priebe - Profihost AG:
>>>>>>>>>
>>>>>>>>>> Am 20.02.2016 um 15:45 schrieb Brian Foster <bfoster at redhat.com>:
>>>>>>>>>>
>>>>>>>>>>> On Sat, Feb 20, 2016 at 09:02:28AM +0100, Stefan Priebe wrote:
>> ...
>>>
>>> This has happened again on 8 different hosts in the last 24 hours
>>> running 4.4.6.
>>>
>>> All of those are KVM / Qemu hosts and are doing NO I/O except the normal
>>> OS stuff as the VMs have remote storage. So no database, no rsync on
>>> those hosts - just the OS doing nearly nothing.
>>>
>>> All those show:
>>> [153360.287040] WARNING: CPU: 0 PID: 109 at fs/xfs/xfs_aops.c:1234
>>> xfs_vm_releasepage+0xe2/0xf0()
>>>
>>
>> Ok, well at this point the warning isn't telling us anything beyond
>> you're reproducing the problem. We can't really make progress without
>> more information. We don't necessarily know what application or
>> operations caused this by the time it occurs, but perhaps knowing what
>> file is affected could give us a hint.
>>
>> We have the xfs_releasepage tracepoint, but that's unconditional and so
>> might generate a lot of noise by default. Could you enable the
>> xfs_releasepage tracepoint and hunt for instances where delalloc != 0?
>> E.g., we could leave a long running 'trace-cmd record -e
>> "xfs:xfs_releasepage" <cmd>' command on several boxes and wait for the
>> problem to occur. Alternatively (and maybe easier), run 'trace-cmd start
>> -e "xfs:xfs_releasepage"' and leave something like 'cat
>> /sys/kernel/debug/tracing/trace_pipe | grep -v "delalloc 0" >
>> ~/trace.out' running to capture instances.

Isn't the trace a WARN_ONCE? So it does not reoccur or can i check the
it in the trace.out even the WARN_ONCE was already triggered?

Stefan


> 
> Stefan
> 
>>
>> Brian
>>
>>> Stefan
>>>
>>>>
>>>> -Dave.
>>>>
>>>
>>> _______________________________________________
>>> xfs mailing list
>>> xfs at oss.sgi.com
>>> http://oss.sgi.com/mailman/listinfo/xfs