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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f39477da-a1ef-e31e-a72d-8ea1d5755234@nvidia.com>
Date:   Tue, 26 Mar 2019 13:11:31 -0700
From:   Ralph Campbell <rcampbell@...dia.com>
To:     William Kucharski <william.kucharski@...cle.com>,
        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



On 3/26/19 6:52 AM, William Kucharski wrote:
> 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>
>>
> 

You might be hitting a bug I found.
Try applying this patch:
https://marc.info/?l=linux-kernel&m=155355953012985&w=2