Re: [Xen-devel] [PATCH] hotplug/Linux: close lockfd after lock attempt

[Olaf Hering <olaf@xxxxxxxxx>]

On Mon, Oct 15, Ian Campbell wrote:

> On Sat, 2012-10-13 at 23:35 +0100, Olaf Hering wrote:
> > On Sat, Oct 13, Olaf Hering wrote:
> > 
> > > hotplug/Linux: close lockfd after lock attempt
> > > 
> > > When a HVM guest is shutdown some of the 'remove' events can not claim
> > > the lock for some reason. Instead they try to grab the lock in a busy
> > > loop, until udev reaps the xen-hotplug-cleanup helper.
> > > After analyzing the resulting logfile its not obvious what the cause is.
> > > The only explanation is that bash (?) gets confused if the same lockfd
> > > is opened again and again. Closing it in each iteration seem to fix the
> > > issue.
> > 
> > Can be reproduced with this testcase on sles11sp2, not on openSuSE 11.4:
> 
> So this is a bash bug? Have you reported it against bash?

It does not happen with a newer bash: bash 3.2 from sles11sp2 fails,
bash 4.1 from openSuSE 11.4 works.

Olaf

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