Is a "KVM internal error" a bug?

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I just got this from a 3.17.4 host (approximately -- it's Fedora's version):

KVM internal error. Suberror: 3
extra data[0]: 80000202
extra data[1]: 31
EAX=8be4df61 EBX=8be4df61 ECX=3ff6002c EDX=11d293ca
ESI=3f08e408 EDI=3e82df7c EBP=3e82deb8 ESP=3e82de7c
EIP=3ff51206 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0018 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0010 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0018 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0018 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0000 92c2c700 ffffffff 00c00000
GS =0000 3ec00000 ffffffff 00c00000
LDT=0000 00000000 ffffffff 00c00000
TR =0040 3ec11440 00002087 00008b00 DPL=0 TSS32-busy
GDT=     04c43171 00000020
IDT=     ff57a000 00000fff
CR0=00050033 CR2=022e5000 CR3=0009c000 CR4=000407f0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000801
Code=0f be 11 29 d0 5b 5d c3 55 89 e5 8b 45 08 5d 8b 50 04 8b 00 <c3>
55 89 e5 8b 45 0c 8b 55 10 8b 4d 08 89 01 89 51 04 5d c3 55 31 c0 89
e5 5d c3 55 89 e5

I deliberately triggered a guest bug, but I didn't expect this
failure.  I think that the issue is that an NMI was delivered using a
bogus IDT, but I think it should have been cleanly promoted to a
double fault and then a triple fault.   Is this a KVM bug?

--Andy
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