kvm: KVM internal error. Suberror: 1

[Sasha Levin]

Hi all,

During some fuzzing with trinity in a KVM guest running on qemu, I got the following error:

KVM internal error. Suberror: 1
emulation failure
RAX=0000000000000000 RBX=ffff8800284108e0 RCX=0000000000000001 RDX=ffffffff84482008
RSI=1030000000000000 RDI=8180000000000000 RBP=ffff880028723d38 RSP=ffff880028723ce8
R8 =0000000000000206 R9 =fffffffff7e80206 R10=0000000000000000 R11=0000000000000000
R12=ffff880028410000 R13=ffffffff846ba1c0 R14=ffffffff84a74970 R15=0000000000009530
RIP=ffffffff8111c862 RFL=00010046 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 ffffffff 00000000
CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 ffffffff 00000000
FS =0000 00007f955873b700 ffffffff 00000000
GS =0000 ffff880035a00000 ffffffff 00000000
LDT=0000 0000000000000000 ffffffff 00000000
TR =0040 ffff880035bd2480 00002087 00008b00 DPL=0 TSS64-busy
GDT=     ffff880035a04000 0000007f
IDT=     ffffffff8436a000 00000fff
CR0=8005003b CR2=00007f5cfdad0518 CR3=000000001a154000 CR4=000407e0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01
Code=66 90 e8 7b 97 ff ff b8 01 00 00 00 eb 1c 0f 1f 40 00 31 c0 <83> 3d 97 9f c7 02 00 0f 95 c0 eb 0a 66 90 31 c0 66 0f 1f 44 00 00 48 8b 5d d8 4c 8b 65 e0
KVM internal error. Suberror: 1
emulation failure
RAX=ffff88000d5f8000 RBX=ffff88000d600010 RCX=0000000000000001 RDX=0000000000000000
RSI=0000000000000001 RDI=ffff88000d5f8000 RBP=ffff88000d601ec8 RSP=ffff88000d601ec8
R8 =0000000000000001 R9 =0000000000000000 R10=0000000000000000 R11=0000000000000000
R12=ffffffff83fed960 R13=0000000000000000 R14=0000000000000000 R15=0000000000000000
RIP=ffffffff8107d696 RFL=00000286 [--S--P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 ffffffff 00000000
CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 ffffffff 00000000
FS =0000 0000000000000000 ffffffff 00000000
GS =0000 ffff880029800000 ffffffff 00000000
LDT=0000 0000000000000000 ffffffff 00000000
TR =0040 ffff8800299d2480 00002087 00008b00 DPL=0 TSS64-busy
GDT=     ffff880029804000 0000007f
IDT=     ffffffff8436a000 00000fff
CR0=8005003b CR2=00007fcfa03f9e9c CR3=0000000003a1c000 CR4=000407e0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01
Code=89 e5 fb c9 c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <c9> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 c9 c3 66 0f 1f 84 00 00 00 00 00 55 8b 07 48
KVM internal error. Suberror: 1
emulation failure
RAX=ffff88000d5db000 RBX=ffff88000d5ce010 RCX=0000000000000001 RDX=0000000000000000
RSI=0000000000000001 RDI=ffff88000d5db000 RBP=ffff88000d5cfec8 RSP=ffff88000d5cfec8
R8 =0000000000000001 R9 =0000000000000000 R10=0000000000000000 R11=0000000000000000
R12=ffffffff83fed960 R13=0000000000000000 R14=0000000000000000 R15=0000000000000000
RIP=ffffffff8107d696 RFL=00000286 [--S--P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 ffffffff 00000000
CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 ffffffff 00000000
FS =0000 0000000000000000 ffffffff 00000000
GS =0000 ffff88001b800000 ffffffff 00000000
LDT=0000 0000000000000000 ffffffff 00000000
TR =0040 ffff88001b9d2480 00002087 00008b00 DPL=0 TSS64-busy
GDT=     ffff88001b804000 0000007f
IDT=     ffffffff8436a000 00000fff
CR0=8005003b CR2=00007fcfa076b518 CR3=000000001a148000 CR4=000407e0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01
Code=89 e5 fb c9 c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <c9> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 c9 c3 66 0f 1f 84 00 00 00 00 00 55 8b 07 48

The assembly doesn't quite make sense, and the fact that I got 3 of these in a row, makes me believe that it isn't an actual emulation error, but something else.

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