From mboxrd@z Thu Jan 1 00:00:00 1970 From: "John W. Linville" Subject: Re: d80211 deadlock with wpa_supplicant and rmmod Date: Wed, 11 Jul 2007 19:41:53 -0400 Message-ID: <20070711234153.GB5099@tuxdriver.com> References: <1caff7430707111617o70a534a5x2cf6b611a91f301a@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: seventh guardian Return-path: Content-Disposition: inline In-Reply-To: <1caff7430707111617o70a534a5x2cf6b611a91f301a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> Sender: linux-wireless-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org On Thu, Jul 12, 2007 at 12:17:35AM +0100, seventh guardian wrote: > Hello, > First of all I'm fairly new to this list (in all, this is my first > message), so please be gentle.. I promise I will try not to waste your > precious time. > > >I believe we have a deadlock in d80211. > > I have it too. But I'm using iwl3945 driver, in-kernel mac80211, and a > gentoo kernel (basically a patched vanilla-2.6.22.1). My machine is a > x86_64 core 2 duo. > > >The following triggers it on my 2way SMT machine with preempt. > > > >modprobe bcm43xx-d80211 > >add sta0 > >ifconfig sta0 up > >start wpa_supplicant on the interface > >rmmod bcm43xx-d80211 > > > >After that rmmod hangs spinning and wpa_supplicant > >stays in D state. > > > >If I first kill wpa_supplicant and then rmmod the module, > >it does not deadlock. > > I can trigger this way: > > modprobe iwl3945 > ifconfig wlan0 up > start wpa_supplicant > do some wpa_supplicant work (for instance issue a scan) > stop wpa_supplicant > > Then it will deadlock (that is, wpa_supplicant will refuse to be > killed). The same thing happens if I try to modprobe the module out > (modprobe will "hang spinning" as you said). I have to ultimately > hard-shutdown my machine to bring it back to normal. It seems you are replying to a very old original message. Since that message was sent, linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org has become the primary forum for wireless discussion. Any chance you are savvy enough with git to try the wireless-dev kernel? git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-dev.git Can you replicate the problem using those sources? If so, you may want to attach your .config in your reply (just in case the exact config makes a difference). Thanks, John -- John W. Linville linville-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org