id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host
11109,"linux (CentOS) host hangs when ""stopping"" iptables",mcfip,,"It does not appear anyone has reported this issue to VirtualBox.  I hope I did not overlook a previous report.

Guest: Windows 7.
Host: CentOS 6.3

After upgrading to 4.2 (now on 4.2.2), my host hangs whenever I stop or restart iptables.  When iptables tries to unload the network modules, it hangs while trying to unload the last module.  I do not recall this happening before 4.2, but I found a thread on the CentOS forum that is identical to my issue in 4.1.x versions.

My system will reboot / shutdown fine if I do not load a VM session.

Once I load (and unload) a VM session, my host will hang everytime while unloading network modules within the iptables script to stop iptables.  This is reproducible 100% of the time.

The hang occurs in iptables script when it trys to unload remaning netfilter modules used by ipv4 and ipv6.
  netfilters to unload == x_tables nf_nat nf_conntrack

  The first two unload fine.  When it unloads nf_conntrack, a referring module"" xt_state is found and it calls rmmod to unload it.

  The script hangs when the ""modprobe -r $mod"" command (modprobe -r xt_state) is executed for the xl_state module.

A CentOS thread describes the same issue from other users:
	http://www.centos.org/modules/newbb/viewtopic.php?topic_id=39553&forum=59

	There is a work-around at the bottom of the thread but this is not ideal and is not recommended (per the comments in the iptables-config file.

I am attaching a vbox.log for the ""guest"" and a vboxsvr.log for the ""host"".

P{lease let me know if you need more information from my system.  I can easily retest and get any log info you may need.

Mike
",defect,closed,other,VirtualBox 4.2.2,fixed,,,other,other