On Tue, Nov 22, 18:06, Greg KH wrote > On Tue, Nov 22, 2016 at 05:59:12PM +0100, Andre Noll wrote: > > On Mon, Nov 21, 10:28, Greg KH wrote > > > I'm announcing the release of the 4.4.34 kernel. > > > > > > All users of the 4.4 kernel series must upgrade. > > > > This update broke PXE boot on our 4-way AMD boxes. The kernel panics in > > eth_type_trans(), presumably during kernel-level IP autoconfiguration, > > see [1]. Bisection points me at 5c67f947 (net: __skb_flow_dissect() > > must cap its return value). And indeed, reverting this commit fixes > > the problem for me. > > > > Investigation showed that the real problem is not the change in the > > above commit per se (i.e., capping ->thoff) but the fact that in the > > success case, where we jump to the "out_good" label, ->thoff is now > > set *after* ->n_proto and ->ip_proto. I fail to see how order matters > > here, but it clearly does, since the crash is 100% reproducible, > > and is fixed by the commit below (on top of v4.4.34). > > > > Please consider applying something like the patch below for mainline > > and -stable. > > If this issue is also the same for Linus's tree, we should cc: netdev so > that the patch can get into there, right? Right, but I haven't tested PXE boot on any kernel newer than 4.4.x so far. All I can say for sure is that the problematic commit is also in Linus' tree (called 34fad54c there). Do you want me to check if mainline is also affected? Andre -- Max Planck Institute for Developmental Biology Spemannstraße 35, 72076 Tübingen, Germany. Phone: (+49) 7071 601 829 http://people.tuebingen.mpg.de/maan/
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