linux-kernel - Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

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: <20171002144418.35mag5uormoqoay5@dhcp22.suse.cz>
Date:   Mon, 2 Oct 2017 16:44:18 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        adrian.hunter@...el.com, linux-mmc@...r.kernel.org,
        linux-mm@...ck.org, penguin-kernel@...ove.SAKURA.ne.jp
Subject: Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

On Sun 01-10-17 12:26:47, Pavel Machek wrote:
> Hi!
> 
> > I inserted u-SD card, only to realize that it is not detected as it
> > should be. And dmesg indeed reveals:
> 
> Tetsuo asked me to report this to linux-mm.
> 
> But 2^4 is 16 pages, IIRC that can't be expected to work reliably, and
> thus this sounds like MMC bug, not mm bug.

Well, I cannot comment on why MMC needs such a large allocation and
whether it can safely fall back to vmalloc but __GFP_RETRY_MAYFAIL
might help to try harder and require compaction to do more work.
Relying on that for correctness is, of course, a different story and
a very unreliable under memory pressure or long term fragmented memory.
-- 
Michal Hocko
SUSE Labs