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[Qemu-discuss] Qemu segfaults

From: Adam Bishop
Subject: [Qemu-discuss] Qemu segfaults
Date: Fri, 17 Feb 2017 21:15:46 +0000


I'm wondering if anyone can shed some light on an issue being encountered in one of our virtualized environments.

Occasionally we have VMs that crash with a segfault encountered in qemu:

qemu-system-x86[3020190]: segfault at 128 ip 00007f09370cba9c sp 00007f0923704000 error 4 in qemu-system-x86_64 (deleted)[7f0936d40000+4b0000]

The libvirt qemu logs record the following message:

KVM internal error. Suberror: 3
extra data[0]: 800000ef
extra data[1]: 31
RAX=00007f4035189c1b RBX=00007f4035189c18 RCX=0000000000000003 RDX=00007f4035189c17
RSI=0000000000000000 RDI=0000000000000004 RBP=00007f4035189c1c RSP=00007fff1cd60ab0
R8 =0000000000000000 R9 =0000000000000000 R10=0000000000000032 R11=0000000000000000
R12=00007f4035189c00 R13=0000000000000018 R14=0000000000001cc0 R15=000000000000003c
RIP=00007f4092714937 RFL=00010206 [-----P-] CPL=3 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 ffffffff 00c00000
CS =0033 0000000000000000 ffffffff 00a0fb00 DPL=3 CS64 [-RA]
SS =002b 0000000000000000 ffffffff 00c0f300 DPL=3 DS   [-WA]
DS =0000 0000000000000000 ffffffff 00c00000
FS =0000 00007f40940f97c0 ffffffff 00c00000
GS =0000 0000000000000000 ffffffff 00c00000
LDT=0000 0000000000000000 ffffffff 00c00000
TR =0040 ffff880028314400 00002087 00008b00 DPL=0 TSS64-busy
GDT=     ffff880028304000 0000007f
IDT=     ffffffff81de9000 00000fff
CR0=80050033 CR2=000000000048ff90 CR3=00000000ba951000 CR4=001406e0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
Code=0f 1f 44 00 00 48 83 ea 01 48 83 e8 01 48 83 e9 01 0f b6 32 <4088 30 75 ec 48 29 fb 48 29 fd f6 c3 07 74 51 4c 89 ea 48 89 de 48 89 ef 48 c1 ea 03 e8
qemu: terminating on signal 15 from pid 37189

This is common to every segfault:

KVM internal error. Suberror: 3
extra data[0]: 800000ef
extra data[1]: 31

Combing various message boards and bugs for this issue hasn't identified any solid leads.

The qemu version being used  qemu-system-x86-64/qemu-kvm 2.0.0+dfsg-2ubuntu1.24


Adam Bishop

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