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** Changed in: linux (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1162924
Title:
bug disabling Xen guest interface
Status in linux package in Ubuntu:
Won't Fix
Bug description:
Kernels that have applied Xen Security Advisory 39 (CVE-2013-0216,
CVE-2013-0217) now disable Xen guest networking in undesirable
situations. The case that many people encounter is where the guest has
MAX_SKB_FRAGS larger than MAX_SKB_FRAGS on dom0. This also occurs with
Windows HVM guests.
We should resolve this issue soon because most people using Ubuntu
dom0 to host VMs will be affected after they apply the latest security
updates.
Logs show something like the following:
xenbr1: port 8(vif51.0) entered forwarding state
vif vif-51-0 vif51.0: Too many frags
vif vif-51-0 vif51.0: fatal error; disabling device
xenbr1: port 8(vif51.0) entered disabled state
There is a thread on the Xen-devel mailing list discussing the issue:
http://lists.xen.org/archives/html/xen-devel/2013-03/msg00404.html
It seems that setting MAX_SKB_FRAGS to 19 on the dom0 kernel will
avoid this issue.
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