From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Wise Subject: Re: Fwd: circular lockdep problem Date: Tue, 24 Jul 2012 14:44:25 -0500 Message-ID: <500EFB19.2090809@opengridcomputing.com> References: <500ECFCD.1040403@opengridcomputing.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Roland Dreier Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org On 07/24/2012 12:06 PM, Roland Dreier wrote: > [resending because I forgot to reply-all] > > On Tue, Jul 24, 2012 at 9:39 AM, Steve Wise wrote: >> Can anyone help me understand how I can resolve this? Its saying there is >> some circular dependency problem with the cxgb4 uld_mutex, the networking >> rtnl_mutex, and ib_core's device_mutex. I can't decipher the stuff below >> though. It only seems to happen when there is a cxgb4 and ipoib device >> present. > Do you have a real IB HCA installed too? Yes. > I suspect this is a lockdep false positive where it is mixing together > lock ordering from the IB - IPoIB adapter and the cxgb4 netdev, > and seeing a deadlock that can't really happen. > > I'll take a look, although I don't have a cxgb4 device so I can't test > directly. Would you be able to test a patch if I come up with one? Sure! Steve. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html