[Qemu-devel] [Bug 1461918] [NEW] guest hangs after use ethtool to set scatter-gather on

[kifast]

Public bug reported:

On the guests,  i have a rtl8139 nic,  I use ethtool to set  scatter-gather on 
( ethtool -K eth0 sg on ),
after that,   at host side,  I  use scp to send a file into guest.  As a 
result, guest hang.
At that point qemu is using 100% of one host CPU, about 100% guest.

If guest is centOS6.5， with no problem.


The guest system is Fedora release 19(Kernel 3.11.10-200.fc19.x86_64).

host system is debian 7.1.
Kernel:3.10.0
Qemu: 2.3.0

cmd:
/boot/qemu-2.3.0-bin/qemu-system-x86_64 -vnc :13 -enable-kvm -name fedora -smp 
sockets=1,cores=2 -cpu core2duo -nodefaults -vga cirrus -k en-us -boot 
menu=on,splash-time=8000 -m 2048 -usb -drive 
file=/boot/vm-disk-1.qcow2,if=none,id=drive-ide0,cache=none,aio=native -device 
ide-hd,bus=ide.0,unit=0,drive=drive-ide0,id=ide0,bootindex=100 -netdev 
type=tap,id=net0,ifname=200,script=/etc/kvm/vtp-bridge -device 
rtl8139,romfile=,mac=FE:FC:FE:5C:58:65,netdev=net0,bus=pci.0,addr=0x12,id=net0

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: rtl8139

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https://bugs.launchpad.net/bugs/1461918

Title:
  guest hangs after use ethtool to set scatter-gather on

Status in QEMU:
  New

Bug description:
  On the guests,  i have a rtl8139 nic,  I use ethtool to set  scatter-gather 
on ( ethtool -K eth0 sg on ),
  after that,   at host side,  I  use scp to send a file into guest.  As a 
result, guest hang.
  At that point qemu is using 100% of one host CPU, about 100% guest.

  If guest is centOS6.5， with no problem.


  The guest system is Fedora release 19(Kernel 3.11.10-200.fc19.x86_64).

  host system is debian 7.1.
  Kernel:3.10.0
  Qemu: 2.3.0

  cmd:
  /boot/qemu-2.3.0-bin/qemu-system-x86_64 -vnc :13 -enable-kvm -name fedora 
-smp sockets=1,cores=2 -cpu core2duo -nodefaults -vga cirrus -k en-us -boot 
menu=on,splash-time=8000 -m 2048 -usb -drive 
file=/boot/vm-disk-1.qcow2,if=none,id=drive-ide0,cache=none,aio=native -device 
ide-hd,bus=ide.0,unit=0,drive=drive-ide0,id=ide0,bootindex=100 -netdev 
type=tap,id=net0,ifname=200,script=/etc/kvm/vtp-bridge -device 
rtl8139,romfile=,mac=FE:FC:FE:5C:58:65,netdev=net0,bus=pci.0,addr=0x12,id=net0

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