linux-kernel - Re: Linux 5.0 regression: BUG: unable to handle kernel paging request at ffff888023e26778 RIP: e030:move_page

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 for Android: free password hash cracker in your pocket

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

Date:   Sat, 9 Feb 2019 19:51:18 +0100
From:   Sander Eikelenboom <linux@...elenboom.it>
To:     Juergen Gross <jgross@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: Re: Linux 5.0 regression: BUG: unable to handle kernel paging request
 at ffff888023e26778 RIP: e030:move_page_tables+0x7c1/0xae0

On 09/02/2019 19:48, Juergen Gross wrote:
> On 09/02/2019 19:45, Sander Eikelenboom wrote:
>> On 09/02/2019 09:26, Sander Eikelenboom wrote:
>>> L.S.,
>>>
>>>
>>> While testing a Linux 5.0-rc5-ish kernel (pull of yesterday) with some additional patches for
>>> already reported other issues i came across the issue below which i haven't seen with 4.20.x
>>>
>>> I haven't got a reproducer so i might be hard to hit it again, 
>>> system is AMD and this is from the host kernel running under
>>> the Xen hypervisor might it matter.
>>
>>> --
>>>
>>> Sander
>>
>> Hi Boris / Juergen,
>>
>> The commit causing this is:
>> 2c91bd4a4e2e530582d6fd643ea7b86b27907151 mm: speed up mremap by 20x on large regions
>>
>> Since it seems there haven't been any other reports about this .. 
>> could it be this doesn't specifically work well with a Xen PVH dom0 ?
> 
> PVH? Not PV?

Ah sorry, indeed PV !

> 
> Juergen
>