netdev - Re: one more... iproute commands lockup whole system

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, 04 Apr 2007 09:58:22 -0400
From:	jamal <hadi@...erus.ca>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Denys <denys@...p.net.lb>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org
Subject: Re: one more... iproute commands lockup whole system

On Wed, 2007-04-04 at 15:36 +0200, Patrick McHardy wrote:

> 
> We have a loop counter (RTTL) in tc_verd. For some reason it is reset
> after ing_filter though.
> 

Essentially it is valuable just to avoid a lot of stacking (separate
issue) and not to avoid the locking issue he is seeing.

> It would be interesting to find out what the problem is exactly.
> The configuration itself looks harmless, so I'm guessing its
> rather a deadlock than a loop.

We know it is a deadlock. 
If you redirect the first time queue lock for eth0 will be held, before
it is released if you do another redirect, it will again be heading
towards eth0 and it will deadlock on grabbing the queue lock.

cheers,
jamal

-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html