Re: [BISECTED][REGRESSION] Loading Hyper-V network drivers is racy in 3.14+ on Hyper-V 2012 R2
From: Sitsofe Wheeler <hidden>
Date: 2014-07-07 18:13:49
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On Mon, Jul 07, 2014 at 04:54:20PM +0000, Haiyang Zhang wrote:
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-----Original Message----- From: Sitsofe Wheeler [mailto:sitsofe@gmail.com] Sent: Sunday, July 6, 2014 4:18 PM To: Haiyang Zhang Cc: KY Srinivasan; David S. Miller; devel@linuxdriverproject.org; linux- kernel@vger.kernel.org; netdev@vger.kernel.org Subject: [BISECTED][REGRESSION] Loading Hyper-V network drivers is racy in 3.14+ on Hyper-V 2012 R2 With the 3.14 kernel Hyper-V no longer reliably enables its networking devices in time on cloud images leading to network devices permanently remaining offline.
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the system will usually stop rebooting before 20 passes but the most extreme cases were always less than 100. With a pre b679ef73edc251f6d200a7dd2396e9fef9e36fc3 kernel it did over 390 passes before I manually stopped it. Originally filed on https://bugzilla.redhat.com/show_bug.cgi?id=1095387 and then on https://bugzilla.kernel.org/show_bug.cgi?id=78771 but without reply... Might also be related to http://thread.gmane.org/gmane.linux.kernel/1711873/focus=1733398 (Regression in hyperv network driver in 3.14).What's the memory size assigned to the Linux guest? And, have you seen any related messages in the dmesg log after this issue?
(Feel free to trim my emails when replying - it makes it easier to see your reply :-) I've had as little as 256 MBytes and as much as 4 GBytes (non-dynamic) and still seen the issue. See https://bugzilla.kernel.org/attachment.cgi?id=142201 for a recent dmesg (an older dmesg snippet can be seen on the Red Hat bugzilla). -- Sitsofe | http://sucs.org/~sits/