Re: A few outstanding xenstore/hotplug issues...

[Anthony Liguori <aliguori@us.ibm.com>]

Matt Ayres wrote:
> Greetings!
>
> I am still noticing a few issues related to xenstore and hotplug.
>
> 1) xenstored will periodically die.  I do have xenstore tracing 
> enabled, but not much is shown.  A transaction is running one second 
> and then nothing (no "FATAL ERROR" or anything). This does not happen 
> very frequently, but does happen now and then. As is known, once 
> xenstored dies the only way to get it running again is with a reboot. 
> A bad effect lies in the fact that domains can't be shutdown properly 
> without xenstored running!

Define "die".  Does it seg fault?  Can you try to repro with ulimit -c 
unlimited and check / to see if there's a core?

If it doesn't drop a core, that is also useful to know as that would 
suggest an exit() of some sort (although no message is rather odd!).

> 2) I get the old "Cannot connect VBD" on boot-up while running 
> xendomains start, I'd assume due to xenstore getting bogged down. It's 
> completely random as to which domains it will do it to.  I've worked 
> around this by having xendomains run from init.d and then also re-run 
> it from rc.local to start all the domains that didn't start the first 
> time.  Even doing this causes some domains to not start properly 
> sometimes (it seems based on how many failed to start the first time).

What changeset are you using and do you have any custom patches going?  
Have you ever seen this without xendomains?

> I remember reading that xenstore is getting an overhaul in the near 
> future and want to know if these are "known issues" and if I should 
> bother submitting bug reports or if I should just sit tight and watch 
> the lists.

I'm not aware of any overhaul although that doesn't mean it isn't 
happening.  I'd appreciate knowing if anyone was planning on doing this 
myself.

Regards,

Anthony Liguori

> Thank you,
> Matt Ayres
>
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