Hello Fengguang,

On (04/02/17 12:13), Fengguang Wu wrote:
[..]
> FYI here is another bisect result. The attached reproduce-* script may
> help reproduce the bug.
> 
> https://github.com/0day-ci/linux/commits/Sergey-Senozhatsky/printk-introduce-printing-kernel-thread/20170330-185752
> 
> commit fbc14616f483788afabe77d05bfb99883dc66c73
> Author:     Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> AuthorDate: Wed Mar 29 18:25:11 2017 +0900
> Commit:     0day robot <fengguang.wu@intel.com>
> CommitDate: Thu Mar 30 18:58:09 2017 +0800
> 
>      printk: enable printk offloading
>      
>      Initialize the kernel printing thread and enable printk()
>      offloading.
>      
>      Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>


thanks! I guess it's the same "sysrq emergency restart does not flush logbuf"
test case failure. if so, then the change below can probably fix it:

	lkml.kernel.org/r/20170331040438.GA366(a)jagdpanzerIV.localdomain

	-ss