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[Qemu-devel] [Bug 1469946] Re: guest can't get IP when create guest with

From: chao zhou
Subject: [Qemu-devel] [Bug 1469946] Re: guest can't get IP when create guest with bridge.
Date: Wed, 01 Jul 2015 06:36:22 -0000

after try the patch 
http://lists.nongnu.org/archive/html/qemu-devel/2015-06/msg07377.html with 
qemu.git commit(d2966f804d70a244f5dde395fc5d22a50ed3e74e)
the guest can get IP, but after save/retore or live migration, the guest is 
alive, but ping or ssh  guest's IP fail .

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  guest can't get IP when create guest with bridge.

Status in QEMU:

Bug description:
  Host OS (ia32/ia32e/IA64):ia32e
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows):linux
  kvm.git Commit:aefbef10e3ae6e2c6e3c54f906f10b34c73a2c66
  qemu.git Commit:dc1e1350f8061021df765b396295329797d66933
  Host Kernel Version:4.1.0
  Hardware:Ivytown_EP, Haswell_EP

  Bug detailed description:
  when create guest with bridge, the guest can not get ip.

  1. fail rate: 3/5
  2. this is a qemu bug:
  kvm      + qemu   =  result
  aefbef10 + dc1e1350    =  bad 
  aefbef10 + a4ef02fd   =  good

  Reproduce steps:
  1. create guest:
  qemu-system-x86_64 -enable-kvm -m 2G -smp 4 -device 
virtio-net-pci,netdev=net0,mac=$random_mac -netdev 
tap,id=net0,script=/etc/kvm/qemu-ifup rhel6u5.qcow

  Current result:
  guest can't get IP

  Expected result:
  guest can get ip

  Basic root-causing log:

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