linux-kernel - Re: [PATCH 0/2] printk: replace ringbuffer

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Date:   Wed, 5 Feb 2020 17:36:41 +0800
From:   lijiang <lijiang@...hat.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        John Ogness <john.ogness@...utronix.de>
Cc:     Petr Mladek <pmladek@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Parri <parri.andrea@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] printk: replace ringbuffer

> On (20/02/05 13:38), lijiang wrote:
>>> On (20/02/05 13:48), Sergey Senozhatsky wrote:
>>>> On (20/02/05 12:25), lijiang wrote:
> 
> [..]
> 
>>>>
>>>> So there is a General protection fault. That's the type of a problem that
>>>> kills the boot for me as well (different backtrace, tho).
>>>
>>> Do you have CONFIG_RELOCATABLE and CONFIG_RANDOMIZE_BASE (KASLR) enabled?
>>>
>>
>> Yes. These two options are enabled.
>>
>> CONFIG_RELOCATABLE=y
>> CONFIG_RANDOMIZE_BASE=y
> 
> So KASLR kills the boot for me. So does KASAN.
> 
For my side, after adding the option 'nokaslr' to kernel command line, I still have the
previously mentioned problem, finally, kernel failed to boot.

Thanks.

> John, do you see any of these problems on your test machine?
> 
> 	-ss
>