linux-kernel - Re: [2.6.33-rc5] Weird deadlock when shutting down

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]

Date:	Mon, 22 Feb 2010 10:14:11 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Xiaotian Feng <xtfeng@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [2.6.33-rc5] Weird deadlock when shutting down

On Mon, 2010-02-22 at 17:12 +0800, Américo Wang wrote:

> Since it hangs in put_cpu() which is just preempt_enable(), so I began
> to suspect if we need a synchronize_sched(), or some barrier perhaps.
> I am not sure at all.

Right.

> Before other experts look at this, I think doing a bisect would be
> very useful.

I was afraid you'd say that, it'll take forever though since I need to
walk over to it after every shutdown, see if it turned off and then turn
it on again (and possibly off).... I guess I'll get started on that.

johannes

--
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/