Re: Question on lockdep and MAX_LOCK_DEPTH
From: Ben Greear
Date: Wed Feb 06 2013 - 10:56:21 EST
On 02/06/2013 05:21 AM, Steven Rostedt wrote:
On Tue, 2013-02-05 at 22:23 -0800, Ben Greear wrote:
On 02/05/2013 08:36 PM, Steven Rostedt wrote:
On Tue, 2013-02-05 at 19:30 -0800, Ben Greear wrote:
It's huge, so here's a link:
http://www.candelatech.com/~greearb/debug.tgz
The trace shows that __netif_receive_skb() is grabbing an
rcu_read_lock() but never releasing it. But I don't see any possible way
that can be true in the code.
Can you apply the following patch and run the trace again. I'd like to
see if the code is going in the path I expect it is.
I'll look at this in detail tomorrow. I have a few patches in dev.c code, maybe
I merged something badly....
I wish you told me that in the beginning. That you modified the core
code. In that case I would have asked to see your modifications before
anything else.
I'm 99% sure that the bug is in your modifications.
I'm sorry, I tried to make that clear.
My tree is here, minus a few debugging patches related to this bug:
http://dmz2.candelatech.com/git/gitweb.cgi?p=linux-3.7.dev.y/.git;a=summary
It's rebased on top of 3.7.6.
The wanlink module I'm using is outside the tree. I recently decided to
release this as GPL, so ignore any conflicting copyright notices to
the contrary in the code:
http://www.candelatech.com/~greearb/wanlink.tgz
The wanlink module is a network impairment tool that acts like a 2-port
bridge. In my current test case, I'm bridging about 300Mbps of traffic
across two ethernet ports. It blows up immediately after starting the
emulation.
Thanks,
Ben
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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