On Monday 07 March 2016 06:19 PM, kernel test robot wrote:
> Greetings,
>
> 0day kernel testing robot got the below dmesg and the first bad commit is
>
> https://github.com/0day-ci/linux Sudip-Mukherjee/i2c-i2c-core-do-not-use-bus-internal-data/20160307-195104
>
> commit f3eab4251515a492aa38e515d9a2322c535ce358
> Author:     Sudip Mukherjee <sudipm.mukherjee@gmail.com>
> AuthorDate: Mon Mar 7 17:19:17 2016 +0530
> Commit:     0day robot <fengguang.wu@intel.com>
> CommitDate: Mon Mar 7 19:51:06 2016 +0800
>
>      i2c: i2c-core: do not use bus internal data
>
>      The variable p is a data structure which is used by the driver core
>      internally and it is not expected that busses will be directly accessing
>      these driver core internal only data.
>
>      Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>

The warnings and stacktrace are expected as there was a WARN_ON() in it. 
But can you please check if the attached patch fixes the BUG: and the 
null pointer dereference. The patch will apply on top of my previous 
patch (i2c: i2c-core: do not use bus internal data).

regards
sudip