[uml-devel] x86_64, TT mode, no tmpfs - steadily growing number of threads

[William Stearns <wstearns@pobox.com>]

Good afternoon, all,
 	With a FC2 x86_64 host with no skas patch (stock RH kernel) and no 
tmpfs, I find that a 2.6.6 uml vm (happens to be i386 slackware) keeps 
getting more and more pids out on the host.  By mounting /tmp as tmpfs, 
this effect goes away; the vm stays around 140 pids and doesn't appear 
to grow any further.
 	When the PID leakage(?) was happening, I would usually contact the 
owner of that VM once it was up around 8,000 host pid's and was occupying 
around 4G of ram so we could recover all of those.  :-)
 	The reason why I didn't have tmpfs mounted on that host was that 
uml.ctl ends up there and for some reason I could not get networking to 
work on x86_64 when /tmp was mounted tmpfs.  By convincing uml_switch and 
the vm itself to use /var/tmp/uml_ctl, networking worked again.
 	Cheers,
 	- Bill

---------------------------------------------------------------------------
 	"First rule: Never sweat the petty things, or pet the sweaty things."
(Courtesy of "Michael J. Dark" <darkmich@zebu.cvm.msu.edu>)
--------------------------------------------------------------------------
William Stearns (wstearns@pobox.com).  Mason, Buildkernel, freedups, p0f,
rsync-backup, ssh-keyinstall, dns-check, more at:   http://www.stearns.org
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