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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
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