From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52538) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFrIY-0003mB-Pj for qemu-devel@nongnu.org; Thu, 16 Jul 2015 18:06:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZFrIV-0006qx-JO for qemu-devel@nongnu.org; Thu, 16 Jul 2015 18:06:34 -0400 Received: from mail-wi0-x233.google.com ([2a00:1450:400c:c05::233]:38347) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFrIV-0006qt-7b for qemu-devel@nongnu.org; Thu, 16 Jul 2015 18:06:31 -0400 Received: by wicmv11 with SMTP id mv11so27954329wic.1 for ; Thu, 16 Jul 2015 15:06:30 -0700 (PDT) Sender: Paolo Bonzini References: <1437040609-9878-1-git-send-email-pbonzini@redhat.com> <20150716190546.GI29283@redhat.com> From: Paolo Bonzini Message-ID: <55A82AE3.6050504@redhat.com> Date: Fri, 17 Jul 2015 00:06:27 +0200 MIME-Version: 1.0 In-Reply-To: <20150716190546.GI29283@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit 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: "Richard W.M. Jones" Cc: kwolf@redhat.com, lersek@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com On 16/07/2015 21:05, Richard W.M. Jones wrote: > 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. I would guess instead that there are two separate bugs, but it's not impossible that it's still there. Paolo