[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] race in vif-common.sh
On 07/03/2017 02:07 PM, Wei Liu wrote: > CC George (author of recent change) and Ian > > On Mon, Jul 03, 2017 at 01:30:09PM +0200, Andreas Kinzler wrote: >> Hello >> >> in /etc/xen/scripts/vif-common.sh there is a function handle_iptable. >> At its start there is a check for a working iptables implementation. >> This check is outside the iptables lock section (claim_lock >> "iptables") and even if it is only a read-only operation the >> underlying iptables operation still accesses the xtables lock. I >> debugged a malfunction (=race) with multiple vif-interfaces down to >> the following iptables error message in the check section above: >> >> iptables -L -n Another app is currently holding the xtables lock. >> Perhaps you want to use the -w option? >> >> So this check needs to be inside the lock or removed at all (iptables >> should be working). Andreas, What version of the script are you looking at? For 4.9 we checked in a fix to this problem that would specifically attempt to use the -w option if it was available; see c/s 3d2010f9ff. From your description it sounds like you are using an older version, is that correct? Can you try cherry-picking that changeset? -George _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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