This is still a severe problem for me as well. I'm surprised this has
not yet been resolved anywhere. When deploying code to a Ubuntu VM
running on a CentOS 5.3 Xen server, this is the error I get
consistently:

 ** [blah.com :: out] remote: Compressing objects:  94% (756/804)   
 ** [blah.com :: out] remote: Compressing objects:  95% (764/804)   
 ** [blah.com :: out] remote: Compressing objects:  96% (772/804)   
 ** [blah.com :: out] remote: Compressing objects:  97% (780/804)   
 ** [blah.com :: out] remote: Compressing objects:  98% (788/804)   
 ** [blah.com :: out] remote: Compressing objects:  99% (796/804)   
 ** [blah.com :: out] remote: Compressing objects: 100% (804/804)   
 ** [blah.com :: out] remote: Compressing objects: 100% (804/804), done.
 ** [blah.com :: out] Disconnecting: Corrupted MAC on input.
 ** [blah.com :: out] fatal: The remote end hung up unexpectedly
 ** [blah.com :: out] fatal: early EOF
 ** [blah.com :: out] fatal: index-pack failed


It exists under these conditions and versions:

Host OS
  CentOS 5.3 64-bit

Xen Kernel
  2.6.18-128.1.10.el5xen #1 SMP Thu May 7 11:07:18 EDT 2009 x86_64

Ethernet from Host OS's dmesg
  eth0: Tigon3 [partno(BCM95787) rev b002 PHY(5787)] (PCI Express) 
10/100/1000Base-T Ethernet 00:19:99:30:f5:f5
  eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] WireSpeed[1] TSOcap[1]
  eth0: dma_rwctrl[76180000] dma_mask[64-bit]
  tg3: eth0: Link is up at 100 Mbps, full duplex.
  tg3: eth0: Flow control is off for TX and off for RX.

Guest OS
  Ubuntu 8.10

Guest Kernel (inherits from dom0)
  2.6.18-128.1.10.el5xen #1 SMP Thu May 7 11:07:18 EDT 2009 x86_64


Changing the rx/tx checksums inside of the guest do nothing to change the 
situation.
Disabling rx/tx checksums on the host os do remedy the problem (likely adding 
other problems to all VMs).

If I run on the host "ethtool -K eth0 tx off rx off" the problem goes
away. Then if I start a git deployment to the VM and in the middle run
"ethtool -K eth0 tx on rx on" then the git is interrupted with the error
above.

I am not yet convinced it's only on Ubuntu VMs that this occurs (but I
have yet to attempt this on a non-Ubuntu VM).

Any further progress on this would be valuable to me.

-Kevin

-- 
networking stalls between domU using vif
https://bugs.launchpad.net/bugs/246789
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