Re: [libvirt] [PATCH] nwfilter: serialize execution of scripts with ebtables cmds

libvir-list-bounces(a)redhat.com wrote on 08/13/2010 03:08:11 PM: driver, I'll push this shortly. For the record, here two scripts, that each execute fine but once run concurrently cause a race. script 1: #!/bin/bash dev=xyzdev while test 1; do ebtables -t nat -A PREROUTING -i ${dev} -j ACCEPT if [ $? -ne 0 ]; then echo "odd!" fi ebtables -t nat -D PREROUTING -i ${dev} -j ACCEPT if [ $? -ne 0 ]; then echo "odd!" fi script 2: #!/bin/bash dev=xyzdev2 while test 1; do ebtables -t nat -A PREROUTING -i ${dev} -j ACCEPT if [ $? -ne 0 ]; then echo "odd!" fi ebtables -t nat -D PREROUTING -i ${dev} -j ACCEPT if [ $? -ne 0 ]; then echo "odd!" fi Output when run concurrently: The kernel doesn't support a certain ebtables extension, consider recompiling your kernel or insmod the extension. odd! The kernel doesn't support a certain ebtables extension, consider recompiling your kernel or insmod the extension. odd! Stefan