linux-kernel - Re: 2.6.22-rc2-mm1

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:	Wed, 23 May 2007 20:21:25 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.22-rc2-mm1

On 05/23, Alan Stern wrote:
>
> Okay, it's clear that the two threads are in deadlock.  It's not clear 
> how the deadlock arose to begin with -- apparently there was a remote 
> wakeup request for a root hub at the same time as a device below that 
> root hub was disconnected, which doesn't make much sense.

Please note that this flush_workqueue() was not safe anyway. We are freezing
tasks, and ksuspend_usb_wq is freezeable. So, it could be frozen before
"khubd" task, and we have another deadlock.

> Anyway, this looks like a good place to use cancel_work_sync().  The

Could you use cancel_rearming_delayed_work() ? (It should be renamed to
cancel_delayed_work_sync()).

Oleg.

-
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/