The warning message:

"failed to disable LRO!"

is coming from the function dev_disable_lro():

/**
 *      dev_disable_lro - disable Large Receive Offload on a device
 *      @dev: device
 *
 *      Disable Large Receive Offload (LRO) on a net device.  Must be
 *      called under RTNL.  This is needed if received packets may be
 *      forwarded to another interface.
 */

dev_disable_lro()
        ...
        if (unlikely(dev->features & NETIF_F_LRO))
                netdev_WARN(dev, "failed to disable LRO!\n");
        ...


Likely relevant callers here:
bond_enslave()
        if (!(bond_dev->features & NETIF_F_LRO))
                dev_disable_lro(slave_dev);
br_add_if()
        dev_disable_lro(dev);

...
Looking like the second, from the trace.

I'd say if you can repro then turn on debug and also
dynamic debug on the files br_if.c and dev.c.  

Possibly another issue with the device name? Is bond1.2001 
a vlan interface?

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https://bugs.launchpad.net/bugs/1771480

Title:
  WARNING: CPU: 28 PID: 34085 at /build/linux-
  90Gc2C/linux-3.13.0/net/core/dev.c:1433 dev_disable_lro+0x87/0x90()

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