[Qemu-devel] [Bug 1656234] [NEW] Qemu core dumped if using virtio-net

[Robert Hu]

Public bug reported:

System Environment
=======
Qemu commit/branch: e92fbc75
Host OS: RHEL7.2 ia32e
Host Kernel: 4.9.0
Guest OS: RHEL7.2 ia32e
Guest Kernel: 4.9.0

Bug detailed description
=======
While create a kvm guest using virtio-net, the qemu will core dump with showing 
"Aborted (core dumped)".
Reproduce Steps
==============
create a guest:
qemu-system-x86_64 -enable-kvm -m 4096 -smp 4 -device 
virtio-net-pci,netdev=nic0,mac=00:16:3e:49:be:24 -netdev 
tap,id=nic0,script=/etc/kvm/qemu-ifup -drive 
file=/ia32e_rhel7u2_kvm.qcow2,if=none,id=virtio-disk0 -device 
virtio-blk-pci,drive=virtio-disk0 -serial file:serial.log

Current Result:
==============

qemu-system-x86_64: 
/workspace/ia32e/nightly/kvm-next-20170105-ef85b6-e92fbc/kvm/qemu/hw/virtio/virtio.c:214:
 virtio_queue_set_notification: Assertion `vq->notification_disabled > 0' 
failed.
Aborted (core dumped)

add info
========
address@hidden Desktop]# dmesg |grep -v virbr0 |tail -n 10
[ 1760.265000] device tap0 left promiscuous mode
[ 1879.148642] device tap0 entered promiscuous mode
[ 1885.213702] kvm [14186]: vcpu0, guest rIP: 0xffffffff81066784 disabled 
perfctr wrmsr: 0xc2 data 0xffff
[ 1912.258783] device tap0 left promiscuous mode
[ 1995.972267] device tap0 entered promiscuous mode
[ 2001.990207] kvm [14335]: vcpu0, guest rIP: 0xffffffff81066784 disabled 
perfctr wrmsr: 0xc2 data 0xffff
[ 2024.703072] device tap0 left promiscuous mode
[ 2145.374239] device tap0 entered promiscuous mode
[ 2151.409948] kvm [14541]: vcpu0, guest rIP: 0xffffffff81066784 disabled 
perfctr wrmsr: 0xc2 data 0xffff
[ 2178.281446] device tap0 left promiscuous mode

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "guest serial log"
   https://bugs.launchpad.net/bugs/1656234/+attachment/4803773/+files/serial.log

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https://bugs.launchpad.net/bugs/1656234

Title:
  Qemu core dumped if using virtio-net

Status in QEMU:
  New

Bug description:
  System Environment
  =======
  Qemu commit/branch: e92fbc75
  Host OS: RHEL7.2 ia32e
  Host Kernel: 4.9.0
  Guest OS: RHEL7.2 ia32e
  Guest Kernel: 4.9.0

  Bug detailed description
  =======
  While create a kvm guest using virtio-net, the qemu will core dump with 
showing "Aborted (core dumped)".
  Reproduce Steps
  ==============
  create a guest:
  qemu-system-x86_64 -enable-kvm -m 4096 -smp 4 -device 
virtio-net-pci,netdev=nic0,mac=00:16:3e:49:be:24 -netdev 
tap,id=nic0,script=/etc/kvm/qemu-ifup -drive 
file=/ia32e_rhel7u2_kvm.qcow2,if=none,id=virtio-disk0 -device 
virtio-blk-pci,drive=virtio-disk0 -serial file:serial.log

  Current Result:
  ==============

  qemu-system-x86_64: 
/workspace/ia32e/nightly/kvm-next-20170105-ef85b6-e92fbc/kvm/qemu/hw/virtio/virtio.c:214:
 virtio_queue_set_notification: Assertion `vq->notification_disabled > 0' 
failed.
  Aborted (core dumped)

  add info
  ========
  address@hidden Desktop]# dmesg |grep -v virbr0 |tail -n 10
  [ 1760.265000] device tap0 left promiscuous mode
  [ 1879.148642] device tap0 entered promiscuous mode
  [ 1885.213702] kvm [14186]: vcpu0, guest rIP: 0xffffffff81066784 disabled 
perfctr wrmsr: 0xc2 data 0xffff
  [ 1912.258783] device tap0 left promiscuous mode
  [ 1995.972267] device tap0 entered promiscuous mode
  [ 2001.990207] kvm [14335]: vcpu0, guest rIP: 0xffffffff81066784 disabled 
perfctr wrmsr: 0xc2 data 0xffff
  [ 2024.703072] device tap0 left promiscuous mode
  [ 2145.374239] device tap0 entered promiscuous mode
  [ 2151.409948] kvm [14541]: vcpu0, guest rIP: 0xffffffff81066784 disabled 
perfctr wrmsr: 0xc2 data 0xffff
  [ 2178.281446] device tap0 left promiscuous mode

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