Re: why xenstore-* hangs if xenstored is not started

[Vincent Hanquez <vincent.hanquez@eu.citrix.com>]

On 22/06/10 09:06, Keir Fraser wrote:
> On 22/06/2010 08:56, "Vincent Hanquez"<Vincent.Hanquez@eu.citrix.com>
> wrote:
>
>> On 22/06/10 08:45, Keir Fraser wrote:
>>> Does the xenstore driver in the dom0 kernel put the process into
>>> uninterruptible sleep? The 2.6.18 kernel simply returns -ENODEV in this case
>>> I think. So perhaps pv_ops has different and inferior behaviour.
>>
>> the behavior was the same in 2.6.18.
>
> Ah, I just see 'if (!is_xenstored_ready()) return -ENODEV' in 2.6.18's
> xenbus_dev.c. I assumed that would have an effect on this case.

hm, maybe it does afterall, and I'm confuse this with a more general 
case; the D state would happens if xenstored doesn't want to reply or is 
dead. This behavior has been there as long as I can remember.

I'm pretty sure though that a while ago (relatively old XenServer 
kernel) starting a xenstore-* without starting xenstored would make it 
stuck until xenstored start.

-- 
Vincent