Re: [PATCH] bonding: move ipoib_header_ops to vmlinux

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From: Wengang Wang <wen.gang.wang@xxxxxxxxxx>
Date: Tue, 25 Nov 2014 13:36:08 +0800

> When last slave of a bonding master is removed, the bonding then does not work.
> At the time if packet_snd is called against with a master net_device, it calls
> then header_ops->create which points to slave's header_ops. In case the slave
> is ipoib and the module is unloaded, header_ops would point to invalid address.
> Accessing it will cause problem.
> This patch tries to fix this issue by moving ipoib_header_ops to vmlinux to keep
> it valid even when ipoib module is unloaded.
> 
> Signed-off-by: Wengang Wang <wen.gang.wang@xxxxxxxxxx>

IPOIB should not work over bonding as it requires that the device
use ARPHRD_ETHER.

Someone mentioned this, and I did not see any response.

Please show how a legitimate real bonding configuration can be
created, reproduce a stray memory access, and therefore potentially
cause a crash.

Using various debugging features of the kernel should allow you to
trigger an assertion quite easily if this bug really exists.
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