> -----Original Message----- > From: Richard Genoud [mailto:richard.gen...@gmail.com] > Sent: Friday, March 01, 2013 3:39 AM > To: Haiyang Zhang > Cc: KY Srinivasan; de...@linuxdriverproject.org; net...@vger.kernel.org; > linux-kernel@vger.kernel.org > Subject: Re: hv_netvsc: WARNING in softirq.c > > 2013/2/28 Haiyang Zhang <haiya...@microsoft.com>: > > We will look into this. And further info around the time will also be > helpful. > > > > Thanks, > > - Haiyang > > The only thing the admin sys could think about is a rsync process > between the windows host and ANOTHER linux guest that ends at 22h30 > more or less. > (the other linux guest is a debian 6, without any HV driver)
I have found a simple way to reproduce this kind of warning: 1) reboot the VM (because this warning can be displayed only once.) 2) login to the host and open the VM [Settings] 3) Temporarily change the Network adapter's option [Virtual Switch] to "Not connected". 4) run dmesg, you should see the warning. The reason for the warning is -- netif_tx_disable() is called when the NIC is disconnected. And it's called within irq context. netif_tx_disable() calls local_bh_enable() which displays warning if in irq. The fix is to remove the unnecessary netif_tx_disable() in the netvsc_linkstatus_callback(). I attached a patch. Would you like to test it on your side as well? Thanks, - Haiyang
net_stat_warn_test.patch
Description: net_stat_warn_test.patch
