Re: [Xen-API] xen-ringwatch - NameError: global name 's' is not defined

[David Scott <dave.scott@xxxxxxxxxxxxx>]

On 22/07/13 12:56, rdartigues.ext@xxxxxxxxxx wrote:
> Good day all,
>
> I'm using XCP release 1.6.10-61809c.
> Suddenly today I got flooded by xen-ringwatch:
I've cc:d xs-devel, since I'm not sure which repository xen-ringwatch 
comes from. I don't think it's part of the xapi toolstack -- is it a 
storage component?
> Traceback (most recent call last):
>    File "/usr/sbin/xen-ringwatch", line 593, in ?
>      watches.update()
>    File "/usr/sbin/xen-ringwatch", line 414, in update
>      entry = RingWatch.new(ring)
>    File "/usr/sbin/xen-ringwatch", line 357, in new
>      state = ring.read()
>    File "/usr/sbin/xen-ringwatch", line 136, in read
>      state = RingState.from_sysfs(self.path())
>    File "/usr/sbin/xen-ringwatch", line 223, in from_sysfs
>      req = cls.Req.from_sysfs(_req, size=nr_ents)
>    File "/usr/sbin/xen-ringwatch", line 240, in from_sysfs
>      raise Exception, "Malformed %s input: %s" % \
> NameError: global name 's' is not defined
>
> So I edited the file:
> --- /usr/sbin/xen-ringwatch     2013-07-22 13:52:19.000000000 +0200
> +++ /usr/sbin/xen-ringwatch     2013-07-22 13:52:30.000000000 +0200
> @@ -238,7 +238,7 @@
>               match = cls._pattern.search(line)
>               if not match:
>                   raise Exception, "Malformed %s input: %s" % \
> -                    (cls.__name__, repr(s))
> +                    (cls.__name__, repr(line))
>
>               i = iter(match.groups())
>               for k in i:
>
> Now I can get an error message:
> # xen-ringwatch check -T3 --kick
> Traceback (most recent call last):
>    File "/usr/sbin/xen-ringwatch", line 593, in ?
>      watches.update()
>    File "/usr/sbin/xen-ringwatch", line 414, in update
>      entry = RingWatch.new(ring)
>    File "/usr/sbin/xen-ringwatch", line 357, in new
>      state = ring.read()
>    File "/usr/sbin/xen-ringwatch", line 136, in read
>      state = RingState.from_sysfs(self.path())
>    File "/usr/sbin/xen-ringwatch", line 223, in from_sysfs
>      req = cls.Req.from_sysfs(_req, size=nr_ents)
>    File "/usr/sbin/xen-ringwatch", line 240, in from_sysfs
>      raise Exception, "Malformed %s input: %s" % \
> Exception: Malformed Req input: 'req prod 2291415749 cons -2003551547 event 
> 2291415750'
>
> Unfortunately I don't understand what has gone wrong... could somebody help me 
> there?
My guess is that the tool is monitoring the state of some of the shared 
memory rings which typically contain (block, disk) request/response 
metadata. Is it looking for unconsumed data and attempting to kick a 
server process? If so, does it have a signed/unsigned integer 
interpretation problem?
Cheers,
Dave

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