From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58570) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFoTi-00069k-4W for qemu-devel@nongnu.org; Thu, 16 Jul 2015 15:05:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZFoTd-0000kZ-N7 for qemu-devel@nongnu.org; Thu, 16 Jul 2015 15:05:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52214) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFoTd-0000kM-Ba for qemu-devel@nongnu.org; Thu, 16 Jul 2015 15:05:49 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id 8A35F96DB for ; Thu, 16 Jul 2015 19:05:48 +0000 (UTC) Date: Thu, 16 Jul 2015 20:05:46 +0100 From: "Richard W.M. Jones" Message-ID: <20150716190546.GI29283@redhat.com> References: <1437040609-9878-1-git-send-email-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1437040609-9878-1-git-send-email-pbonzini@redhat.com> Subject: Re: [Qemu-devel] [PATCH v2 0/3] AioContext: ctx->dispatching is dead, all hail ctx->notify_me List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: kwolf@redhat.com, lersek@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com Sorry to spoil things, but I'm still seeing this bug, although it is now a lot less frequent with your patch. I would estimate it happens more often than 1 in 5 runs with qemu.git, and probably 1 in 200 runs with qemu.git + the v2 patch series. It's the exact same hang in both cases. Is it possible that this patch doesn't completely close any race? Still, it is an improvement, so there is that. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org