netdev - Re: [Bugme-new] [Bug 16626] New: Machine hangs with EIP at skb_copy_and_csum

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Date:	Thu, 19 Aug 2010 22:11:42 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Plamen Petrov <pvp-lsts@...uni-ruse.bg>
Cc:	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 16626] New: Machine hangs with EIP at
 skb_copy_and_csum_dev

On Fri, 20 Aug 2010 08:03:21 +0300 Plamen Petrov <pvp-lsts@...uni-ruse.bg> wrote:

> (responding via emailed reply-to-all)
> 
> ____ 20.8.2010 __. 01:21, Andrew Morton ____________:
> >
> > (switched to email.  Please respond via emailed reply-to-all, not via the
> > bugzilla web interface).
> >
> > On Thu, 19 Aug 2010 09:57:25 GMT
> > bugzilla-daemon@...zilla.kernel.org wrote:
> >
> >> https://bugzilla.kernel.org/show_bug.cgi?id=16626
> >>
> >>             Summary: Machine hangs with EIP at skb_copy_and_csum_dev
> >>             Product: Drivers
> >>             Version: 2.5
> >>      Kernel Version: 2.6.36-rc1-00127-g763008c
> >>            Platform: All
> >>          OS/Version: Linux
> >>                Tree: Mainline
> >>              Status: NEW
> >>            Severity: blocking
> >>            Priority: P1
> >>           Component: PCI
> >>          AssignedTo: drivers_pci@...nel-bugs.osdl.org
> >>          ReportedBy: pvp-lsts@...uni-ruse.bg
> >>          Regression: Yes
> >
> > A post-2.6.35 regression.
> >
> >>
> >> After upgrade from 2.6.33.7 to 2.6.35.2 a server hanged twice, so
> >> continued on 2.6.33.7.
> >>
> >> Today decided to try lates Linus' tree with no luck.
> >>
> >> The first time I started on 2.6.36-rc1-00127-g763008c it ran for a few
> >> minutes, then whent dead with this on the screen:
> >> [picture 1]
> >> http://picpaste.com/9cfb03116d41f27568e1bb2a67b7f4dc.jpg
> >>
> >> [picture 2]
> >> Then I power-cycled the machine, only two get this:
> >> http://picpaste.com/6d70f453e462d1aed038781ad4bdb741.jpg
> >>
> >> And because [picture 2] seemed too bad on the lower half of the screen,
> >> here is
> >> [picture 3]
> >> http://picpaste.com/0a51ae079ace2e4abd9e9d29226069f7.jpg
> >
> > Might have triggered the BUG_ON() in skb_copy_and_csum_dev().  Might be
> > a tg3 thing.  Hard to tell.
> >
> > It'd be really nice to get that first screenful.  Sigh.  How long have
> > we had this oops-scrolls-off problem??  Perhaps you could set
> > /proc/sys/kernel/printk_delay to 100 (it's in milliseconds) so that the
> > oops scrolls past nice and slowly?
> >
> So you need the begining of the oops screen - I will try to get that
> with the proposed pirntk_delay setting.

Thanks.

> But wich kernel should I use? Linus' latest tree or 2.6.35.2 ? They
> both fail the same way here, as far as I can say.

Current mainline would be best, because we'd fix the bug there first
then backport the fix into -stable.  But it doesn't matter a lot in
this case - whatever's most convenient for you, I'd say.

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