linux-kernel - Re: Infinite looping observed in __offline

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: <87r2jifimk.fsf@concordia.ellerman.id.au>
Date:   Wed, 01 Aug 2018 21:09:39 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Michal Hocko <mhocko@...nel.org>, John Allen <jallen@...ux.ibm.com>
Cc:     n-horiguchi@...jp.nec.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com,
        mgorman@...e.de
Subject: Re: Infinite looping observed in __offline_pages

Michal Hocko <mhocko@...nel.org> writes:
> On Wed 25-07-18 13:11:15, John Allen wrote:
> [...]
>> Does a failure in do_migrate_range indicate that the range is unmigratable
>> and the loop in __offline_pages should terminate and goto failed_removal? Or
>> should we allow a certain number of retrys before we
>> give up on migrating the range?
>
> Unfortunatelly not. Migration code doesn't tell a difference between
> ephemeral and permanent failures.

What's to stop an ephemeral failure happening repeatedly?

cheers