Re: [Xen-devel] vbd devices stuck in Initialising/InitWait

["Christopher S. Aker" <caker@xxxxxxxxxxxx>]

Christopher S. Aker wrote:
> When devices are missing, talk_to_backend() is making duplicate calls 
> for the same vbd to xenbus_switch_state(), and on the second call 
> xenbus_switch_state avoids writing to xenstore an identical value (which 
> it's supposed to).  Why the duplicate calls?
That got me thinking .. The duplicate calls are happening for some 
reason, but they're never attempting to write out the state value again 
because of this code in xenbus_switch_state():
if (state == dev->state) {
        return 0;
}

The initial call to xenbus_switch_state() _did_ set the value in 
dev->state, it just never made it into xenstore even though the 
xenbus_printf call didn't return an error.
So, commenting out the code above makes everything work.  15 reboots and 
all the devices have show up every time.
I don't know why the first call to xenbus_switch_state() isn't really 
writing out the value to xenstore. xenbus_printf() isn't returning an 
error, but still the value fails to make it into the store.  That's the 
best of my understanding at the moment...
-Chris


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