linux-kernel - Re: BUG: scheduling while atomic

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Message-Id: <11EC5046-5F30-4CB6-BDAF-0DAA2C69929B@it-loops.com>
Date:	Mon, 6 Jul 2009 17:28:06 +0200
From:	Michael Guntsche <mike@...loops.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: BUG: scheduling while atomic


On Jul 6, 2009, at 10:31, Herbert Xu wrote:

> On Mon, Jul 06, 2009 at 03:43:33PM +0800, Herbert Xu wrote:
>>
>> I think the first backtrace is bogus, this is where the real
>> problem is.  So what see here is that on xmit from the network,
>> PPP will call pty_write from BH context which eventually leads
>> to tty_throttle and the sleep.
>
> Here's the stupidest possible fix for this, changing the mutex
> to a spin lock.  We should also revert the other commit that
> tried to fix this, a6540f731d506d9e82444cf0020e716613d4c46c as
> those unthrottles are really needed
<snip>

Just to confirm.
I reverted the commit and applied the patch on-top of 2.6.31-rc2.
Up to now I was not able to reproduce the crashes I had before on my  
setup here.


Kind regards,
Michael
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