netdev - Re: [patch 10/10] forcedeth: work around NULL skb dereference crash

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: <20070403062629.GA13210@elte.hu>
Date:	Tue, 3 Apr 2007 08:26:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ayaz Abdulla <AAbdulla@...dia.com>
Cc:	akpm@...ux-foundation.org, jeff@...zik.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 10/10] forcedeth: work around NULL skb dereference crash

* Ayaz Abdulla <AAbdulla@...dia.com> wrote:

> I had responded eariler to the thread asking you to try out the patch
> found in bug 8058:
> http://bugzilla.kernel.org/show_bug.cgi?id=8058
> 
> I believe that is the caush of the NULL skb dereference issue.

there's a different type of regression now: under high load i dont get a 
crash, i get a hung interface instead. No error packets or other weird 
interface state - just a hung interface. The condition happens after a 
stream of:

 eth1: too many iterations (6) in nv_nic_irq.
 eth1: too many iterations (6) in nv_nic_irq.
 eth1: too many iterations (6) in nv_nic_irq.
 eth1: too many iterations (6) in nv_nic_irq.
 eth1: too many iterations (6) in nv_nic_irq.

If i increase max_interrupt_work from 5 to 50 to paper over this 
condition then the hangs go away. So i suspect there might still be a 
queue-wakeup problem in one of these paths - or that a filled up tx ring 
somehow gets stuck. (and i've got commits 3ba4d093fe8a26f and 
fcc5f2665c81e08, so all the latest stuff that is upstream at the moment)

	Ingo
-
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