Re: [mm/kasan] 80a9201a59 BUG: kernel reboot-without-warning in early-boot stage, last printk: Booting the kernel.

[Andrey Ryabinin]

On 02/28/2017 06:12 AM, Fengguang Wu wrote:
> Hi Alexander,
> 
> FYI, we find an old bug that's still alive in linux-next. The attached
> reproduce-* script may help debug the problem.
> 

...

> +--------------------------------------------------------------------------------------+------------+------------+
> |                                                                                      | c146a2b98e | 80a9201a59 |
> +--------------------------------------------------------------------------------------+------------+------------+
> | boot_successes                                                                       | 740        | 48         |
> | boot_failures                                                                        | 0          | 142        |
> | BUG:kernel_reboot-without-warning_in_early-boot_stage,last_printk:Booting_the_kernel | 0          | 131        |
> | BUG:kernel_in_stage                                                                  | 0          | 11         |
> +--------------------------------------------------------------------------------------+------------+------------+
> 


Indeed it is an old bug, I'll send a fix shortly. But the bisection result is not correct. This bug is actually much older.
Note that commit 80a9201a596 changes Kconfig dependency - it removes depends on SLUB_DEBUG from config KASAN section.
And yours config has:
	# CONFIG_SLUB_DEBUG is not set

So you simply test c146a2b98e with CONFIG_KASAN=n and 80a9201a59 with CONFIG_KASAN=y