On 01/24/2017 01:51 PM, Boris Ostrovsky wrote: > On 01/24/2017 01:44 PM, Diederik de Haas wrote: >> On dinsdag 24 januari 2017 13:28:28 CET Boris Ostrovsky wrote: >>>>> Reported it at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=852324 >>>>> but given Ben Hutchings' reaction it seems to be a Xen problem after >>>>> all. >>>>> >>>>> Relevant part of earlier attached dmesg: >>>>> >>>>> [ 13.588386] WARNING: CPU: 18 PID: 1 at >>>>> /build/linux-zDY19G/linux-4.8.15/arch/x86/mm/dump_pagetables.c:225 >>>>> note_page+0x5e8/0x790 [ 13.588388] x86/mm: Found insecure W+X mapping >>>>> at address ffff880000000000/0xffff880000000000 ... >>>>> [ 13.608867] x86/mm: Checked W+X mappings: FAILED, 4602 W+X pages >>>>> found. >>>> Now this is a know issue, but I'm pretty convinced one that's entirely >>>> unrelated to your problem. >>> I thought we fixed this. That's what is_hypervisor_range() was >>> introduced for, and I haven't seen this warning since then. Actually, I do see the warnings (I usually don't set CONFIG_DEBUG_WX). They are not for the hypervisor range though, so the commit below is not relevant. Nevertheless, as Jan said, it's unlikely to cause your problem. -boris >> When? Which commit? >> Maybe it isn't (yet) in the Debian tree and/or I am using a kernel which >> doesn't contain that fix. > > Commit f4e342c87776884f0309942a3880ca7e835239f9. > > All it did was to prevent the walker from trying to verify pages in the > hypervisor range so it doesn't really fix anything. It's just that I am > surprised to see this warning again.
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