linux-kernel - Re: [ipw3945-devel] hang on 2.6.33-rc4

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Date:	Thu, 21 Jan 2010 01:28:01 +0100
From:	Norbert Preining <preining@...ic.at>
To:	Zhu Yi <yi.zhu@...el.com>,
	Johannes Berg <johannes@...solutions.net>
Cc:	"Chatre, Reinette" <reinette.chatre@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>
Subject: Re: [ipw3945-devel] hang on 2.6.33-rc4

Dear all,

On Mi, 20 Jan 2010, Zhu Yi wrote:
> Looks like this this is the BUG_ON in skb_pull. Please try if this patch
> help? BTW, are you using swiotlb?

On Mi, 20 Jan 2010, Johannes Berg wrote:
> > # CONFIG_FRAME_POINTER is not set
> 
> The stacktrace would be a lot more useful with it set, yes. Other than
> that, I don't know. If there's a way to make your display resolution
> higher that might be useful so more info fits on the screen, or maybe
> trimming the stack trace depth (though I don't know if that's possible,
> I do know it is on powerpc because I added it there but not sure on x86)
> 
> All assuming you can reproduce this issue, of course.


@Zhu: the patch didn't help. I patched it into the kernel plus activated
CONFIG_FRAME_POINTER which led to the same hang (not surprisingly, the
patch does only debug more ;-)

This time unfortunately I there was too much output to actually capture it.

@Johannes: 100% reproducible. Everytime I boot into 33-rc4 and ssh into
any remote place it goes boom. 100%.

Maybe another tidbig might help: With 2.6.32.3 it happens that I have
hickups with WLAN:
[  996.514491] iwlagn 0000:06:00.0: iwl_tx_agg_start on ra = 00:24:c4:ab:bb:42 tid = 0
and the connections needs 10-20secs (hard to guess) until it is
back alive.

Best wishes

Norbert
------------------------------------------------------------------------
Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
JAIST, Japan            TU Wien, Austria           Debian TeX Task Force
DSA: 0x09C5B094   fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
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