[ovirt-devel] VDSM - sampling.py - remove() called without previous add()

[Christopher Pereira]

On 29-04-2015 7:46, Francesco Romani wrote:
> ----- Original Message -----
>> From: "Christopher Pereira" <kripper at imatronix.cl>
>> To: "Nir Soffer" <nsoffer at redhat.com>
>> Cc: devel at ovirt.org
>> Sent: Wednesday, April 29, 2015 12:33:01 PM
>> Subject: Re: [ovirt-devel] VDSM - sampling.py - remove() called without previous add()
>>
>> On 28-04-2015 17:44, Nir Soffer wrote:
>>>> In sampling.py, remove() is being called without calling add() before,
>>>> which
>>>> throws:
>>> Fixed in master, please update:
>>> https://gerrit.ovirt.org/40223
>>>
>> Hi Nir,
>>
>> Still present:
>>
>> Traceback (most recent call last):
>>     File "/usr/lib/python2.7/site-packages/yajsonrpc/__init__.py", line
>> 464, in _serveRequest
>>       res = method(**params)
>>     File "/usr/share/vdsm/rpc/Bridge.py", line 273, in _dynamicMethod
>>       result = fn(*methodArgs)
>>     File "/usr/share/vdsm/API.py", line 339, in destroy
>>       res = v.destroy()
>>     File "/usr/share/vdsm/virt/vm.py", line 3517, in destroy
>>       result = self.doDestroy()
>>     File "/usr/share/vdsm/virt/vm.py", line 3535, in doDestroy
>>       return self.releaseVm()
>>     File "/usr/share/vdsm/virt/vm.py", line 3450, in releaseVm
>> <-------------------------------- Also called here
>>       sampling.stats_cache.remove(self.id)
>>     File "/usr/share/vdsm/virt/sampling.py", line 428, in remove
>>       del self._vm_last_timestamp[vmid]
> So you reproduced this bug with VDSM with 40223 applied (let's say, today's master branch)?
Yes. I cloned github and am pulling patches from gerrit.
I also checked the file to confirm the patch was applied.

> Which flow is this, just shutdding down a VM?
I guess the VM was down and about to start. It probably failed to start 
because the MasterStorageDomain was down.
> I did basic sanity check as part of verification of 40223, and didn't noticed
> blatant mistakes. :\
>
I saw the patch eliminating the remove() call from one section, but it 
was also called on another one (vm.py, line 3450).

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