Re: port-xen/50659: Xen4.5 crash with vnds

[christos%zoulas.com@localhost (Christos Zoulas)]

On Mar 24, 10:34pm, bouyer%antioche.eu.org@localhost (Manuel Bouyer) wrote:
-- Subject: Re: port-xen/50659: Xen4.5 crash with vnds

| On Thu, Mar 24, 2016 at 10:22:36PM +0100, Christoph Badura wrote:
| > On Thu, Mar 24, 2016 at 09:38:06PM +0100, Manuel Bouyer wrote:
| > > > If you looks at the linux hotplug scripts, they do their own serialization
| > > > as appropriate.  "grep -r _lock hotplug/Linux".
| > > 
| > > I tried to do something with shlock(1) but it doens't work, it's too
| > > slow and xl times out. 
| > > Maybe flock would work but older NetBSD don't have it ...
| > 
| > I noticed that you said before that shlock was too slow.  I'm surprised.
| > The linux claim_lock functions calls out to perl...
| 
| the problem is that shlock can't wait on the lock by itself.
| If it fail you have to retry, and in sh I didn't find a way to sleep
| for less than 1s before retry (or you could busy-wait but I'm not sure
| it's better).

1. sleep 0.5 works
2. there is also flock(1)

christos