RE: [BISECTED][REGRESSION] Loading Hyper-V network drivers is racy in 3.14+ on Hyper-V 2012 R2

-----Original Message-----
From: Sitsofe Wheeler [mailto:sitsofe@gmail.com]
Sent: Monday, July 14, 2014 5:31 PM
To: Haiyang Zhang
Cc: KY Srinivasan; David S. Miller; devel@linuxdriverproject.org; linux-
kernel@vger.kernel.org; netdev@vger.kernel.org
Subject: Re: [BISECTED][REGRESSION] Loading Hyper-V network drivers is
racy in 3.14+ on Hyper-V 2012 R2

On Fri, Jul 11, 2014 at 03:25:11PM +0000, Haiyang Zhang wrote:

quoted

Since you found the commit b679ef73edc is related to this problem,
could you do a simple test:
  Reduce the receive buffer size back to 2MB, like below, then re-test
  it, see if the problem goes away?
	drivers/net/hyperv/hyperv_net.h
	#define NETVSC_RECEIVE_BUFFER_SIZE		(1024*1024*2)	/* 2MB

*/

After doing this I was able to reach over 900 reboots where the network
connected properly.

Thanks for the tests! I will make a patch that can automatically retry
smaller memory allocs when memory is insufficient.

Thanks,
- Haiyang