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[Bug 1200243] Re: Network lock up Windows Azure/Hyper-V


If we're not close to a solution... I'm tempted to suggest creating
daily saucy images with 'ethtool -K eth0 sg off' running on ifup, via
some injected network config script.

it could look like this. 
$ cat /etc/network/if-up.d/bug-1200243
[ "$IFACE" = "eth0" ] || exit 0
kver=$(uname -r)
case "$kver" in
  3.10.0-3*) :;;
  *) exit 0;;
echo "BUG 1200243 workaround: ethtool -K eth0 sg off" | logger
ethtool -K eth0 sg off
$ chmod 755 /etc/network/if-up.d/bug-1200243

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  Network lock up Windows Azure/Hyper-V

Status in “linux” package in Ubuntu:
Status in Gentoo Linux:

Bug description:
  Netwokring on Windows Azure 13.10 instance just lock up. After
  diagnosis, it appears that the root cause is networking. MS reports
  that OpenSUSE 12.3 had the same problem and was patched via:

  Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
  Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
  Reported-by: Olaf Hering <olh@xxxxxxx>

  Cc: Stable <stable@xxxxxxxxxxxxxxx>  (V3.8+)
   drivers/hv/ring_buffer.c |    1 +
   1 files changed, 1 insertions(+), 0 deletions(-)
  diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
  index cafa72f..d6fbb577 100644
  --- a/drivers/hv/ring_buffer.c
  +++ b/drivers/hv/ring_buffer.c
  @@ -71,6 +71,7 @@ u32 hv_end_read(struct hv_ring_buffer_info *rbi)
   static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi)
  +	smp_mb();
   	if (rbi->ring_buffer->interrupt_mask)
   		return false;

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