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