linux-kernel - Re: CONFIG_DEBUG_VIRTUAL breaks boot on x86-32

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Date:   Tue, 26 Mar 2019 07:52:07 -0600
From:   William Kucharski <william.kucharski@...cle.com>
To:     Meelis Roos <mroos@...ux.ee>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: CONFIG_DEBUG_VIRTUAL breaks boot on x86-32

Does this still happen on 5.1-rc2?

Do you have idea as to what max_low_pfn() gets set to on your system at boot time?

From the screen shot I'm guessing it MIGHT be 0x373fe, but it's hard to know for sure.


> On Mar 21, 2019, at 2:22 PM, Meelis Roos <mroos@...ux.ee> wrote:
> 
> I tried to debug another problem and turned on most debug options for memory.
> The resulting kernel failed to boot.
> 
> Bisecting the configurations led to CONFIG_DEBUG_VIRTUAL - if I turned it on
> in addition to some other debug options, the machine crashed with
> 
> kernel BUG at arch/x86/mm/physaddr.c:79!
> 
> Screenshot at http://kodu.ut.ee/~mroos/debug_virtual-boot-hang-1.jpg
> 
> The machine was Athlon XP with VIA KT600 chipset and 2G RAM.
> 
> -- 
> Meelis Roos <mroos@...ux.ee>
>