linux-kernel - Re: [PATCH 3.3] memcg: free mem

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: <alpine.LSU.2.00.1203091138260.19300@eggly.anvils>
Date:	Fri, 9 Mar 2012 11:58:34 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Tejun Heo <tj@...nel.org>, Ying Han <yinghan@...gle.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3.3] memcg: free mem_cgroup by RCU to fix oops

On Wed, 7 Mar 2012, Hugh Dickins wrote:
> 
> I'm posting this a little prematurely to get eyes on it, since it's
> more than a two-liner, but 3.3 time is running out.  If it is what's
> needed to fix my oopses, I won't really be sure before Friday morning.
> What's running now on the machine affected is using kfree_rcu(), but I
> did hack it earlier to check that the vfree_rcu() alternative works.

Yes, please do send that patch on to Linus for 3.3.

It did not get as much as the 36 hours of testing I had hoped for, only
25 hours so far.  12 hours while I was out yesterday got wasted by a
wireless driver interrupt spewing approximately one million messages:

iwl3945 0000:08:00.0: MAC is in deep sleep!. CSR_GP_CNTRL = 0xFFFFFFFF

which I've not suffered from before, and hope not again.  Having kdb
in, I did take a look what was going on with the memcg load when it was
interrupted: it appeared to be normal, and I've no reason to suppose that
my kfree_rcu() was in any way responsible for the wireless aberration.

Thanks,
Hugh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/