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

[chao zhou]

the first bad commit is
commit a90a7425cf592a3afeff3eaf32f543b83050ee5c
Author: Fam Zheng <address@hidden>
Date:   Thu Jun 4 14:45:17 2015 +0800

    tap: Drop tap_can_send
    
    This callback is called by main loop before polling s->fd, if it returns
    false, the fd will not be polled in this iteration.
    
    This is redundant with checks inside read callback. After this patch,
    the data will be sent to peer when it arrives. If the device can't
    receive, it will be queued to incoming_queue, and when the device status
    changes, this queue will be flushed.
    
    Signed-off-by: Fam Zheng <address@hidden>
    Message-id: address@hidden
    Signed-off-by: Stefan Hajnoczi <address@hidden>

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https://bugs.launchpad.net/bugs/1469946

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

Status in QEMU:
  New

Bug description:
  Environment:
  ------------
  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.

  note:
  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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