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

 

I've just verified on saucy daily images that this seems to be work-aroundable by launching with user-data containing a boothook that will run ethtool -K eth0 gso off.
example cloud-config:

#cloud-config
apt_update: true
apt_upgrade: true
packages: [ pastebinit ]
output: {all: '| tee -a /var/log/cloud-init-output.log'}
bootcmd:
 - [ ethtool, -K, eth0, gso, "off" ]

So far though, I'm 2 for 2 in reproducing bug 1201567 (300 second scsi
timeout before / is mounted RW), that results in a over 5 minutes before
instance is reachable.

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https://bugs.launchpad.net/bugs/1200243

Title:
  Network lock up Windows Azure/Hyper-V

Status in “linux” package in Ubuntu:
  In Progress
Status in Gentoo Linux:
  New

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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