netdev - Re: [Bugme-new] [Bug 14749] New: Kernel locks up after a few minutes of heavy surfing

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Date:	Tue, 8 Dec 2009 01:03:15 -0800 (PST)
From:	Chris Rankin <rankincj@...oo.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	bugme-daemon@...zilla.kernel.org, stable@...nel.org,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [Bugme-new] [Bug 14749] New: Kernel locks up after a few minutes of heavy surfing

--- On Tue, 8/12/09, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Its all two years old UDP bugs (I spot another one some
> hours ago), and very rare.

> I am quite suprised it could happen on your machine on
> demand.

Who said anything about "on demand"? It took about 30 minutes to freeze last time; I was starting to think that a complete recompile had fixed it!

For the record: I've only seen that dmesg warning I've reported *once*, and that didn't kill the machine immediately (hence I was able to report it in the first place).

> 1) Do you have another NIC adapter to try ? It might be a
> buggy driver. (Neil Horman found an error on Intel drivers some
> hours ago, that can corrupt skbs)

I can test any patches for a e1000 that apply to 2.6.31.x. But the e1000 is an on-board device and I don't have another. But Fedora's 2.6.31.x kernels seem OK.

> 2) Could you add following debugging aid ?

Not a problem; I do have a serial console attached.

> 3) Any chance you can do a git bisect ?

How do you git-bisect a bug that you can't reproduce on demand? A negative is easy to spot, but a positive would be not experiencing a random freeze. As I said, I *almost* thought that I'd resolved the issue by recompiling last night.

Cheers,
Chris

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