linux-kernel - Re: [hyperv] BUG at drivers/hv/channel.c:462 while changing MTU

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Date:	Mon, 25 Aug 2014 12:48:08 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Sitsofe Wheeler <sitsofe@...il.com>
Cc:	Haiyang Zhang <haiyangz@...rosoft.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jason Wang <jasowang@...hat.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [hyperv] BUG at drivers/hv/channel.c:462 while changing MTU

 via


On Wed, Aug 20, 2014 at 5:41 AM, Sitsofe Wheeler <sitsofe@...il.com> wrote:
> Aug 20 04:04:41 ubuntuhv kernel: [    9.230399] random: nonblocking pool is initialized
> Aug 20 04:04:41 ubuntuhv kernel: [   10.338487] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro
> Aug 20 04:04:41 ubuntuhv kernel: [   11.099094] hv_storvsc vmbus_0_1: cmd 0x85 scsi status 0x2 srb status 0x6
> Aug 20 04:04:41 ubuntuhv kernel: [   11.099901] hv_storvsc vmbus_0_1: cmd 0x85 scsi status 0x2 srb status 0x6
> Aug 20 04:04:43 ubuntuhv kernel: [   12.999830] psmouse serio1: trackpoint: IBM TrackPoint firmware: 0x01, buttons: 0/0
> Aug 20 03:55:47 ubuntuhv kernel: [   13.003659] input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/input/input4
> Aug 20 03:57:28 ubuntuhv kernel: [  113.711832] hv_netvsc vmbus_0_14: net device safe to remove
> Aug 20 03:57:28 ubuntuhv kernel: [  113.713882] hv_netvsc: hv_netvsc channel opened successfully
> Aug 20 03:57:29 ubuntuhv kernel: [  114.961312] hv_netvsc vmbus_0_14: Send section size: 6144, Section count:2560
> Aug 20 03:57:29 ubuntuhv kernel: [  114.962711] hv_netvsc vmbus_0_14: Device MAC 00:15:5d:6f:02:af link state up
> Aug 20 03:57:34 ubuntuhv kernel: [  120.027718] hv_netvsc vmbus_0_14: net device safe to remove
> Aug 20 03:57:34 ubuntuhv kernel: [  120.030047] hv_netvsc: hv_netvsc channel opened successfully
> Aug 20 03:57:34 ubuntuhv kernel: [  120.035422] hv_netvsc vmbus_0_14 eth0: unable to establish receive buffer's gpadl
> Aug 20 03:57:34 ubuntuhv kernel: [  120.039778] hv_netvsc vmbus_0_14 eth0: unable to connect to NetVSP - 4
> Aug 20 03:57:34 ubuntuhv kernel: [  120.039818] ------------[ cut here ]------------
> Aug 20 03:57:34 ubuntuhv kernel: [  120.039832] kernel BUG at drivers/hv/channel.c:504!

This is one is also a rude BUG_ON:
        ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel));

        BUG_ON(ret != 0);

vmbus_post_msg() hv_post_message() can easily return !0.
i.e. if this kmalloc() fails:
        addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
        if (!addr)
                return -ENOMEM;

-- 
Thanks,
//richard
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