From mboxrd@z Thu Jan 1 00:00:00 1970 From: Olivier Bonvalet Subject: Re: Issue #5876 : assertion failure in rbd_img_obj_callback() Date: Thu, 27 Mar 2014 08:48:56 +0100 Message-ID: <1395906536.28805.9.camel@localhost> References: <1395736765.2823.29.camel@localhost> <1395780835.2076.15.camel@localhost> <1395781847.2076.21.camel@localhost> <1395782577.2076.23.camel@localhost> <1395783675.2076.26.camel@localhost> <1395784476.2076.28.camel@localhost> <1395785839.2076.30.camel@localhost> <5332075F.8080105@ieee.org> <1395788695.2076.35.camel@localhost> <53321896.1080606@ieee.org> <1395797596.2076.43.camel@localhost> <1395798658.2076.45.camel@localhost> <5332339A.8030000@ieee.org> <1395801625.2076.52.camel@localhost> <53323EA5.6010506@ieee.org> <1395801940.2076.54.camel@localhost> <53324F79.1080108@ieee.org> <1395806447.2076.70.camel@localhost> <53325F09.7000306@ieee.org> <5332B643.5040403@ieee.org> <53333F73.709@ieee.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from licorne.daevel.fr ([178.32.94.222]:43076 "EHLO licorne.daevel.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751524AbaC0HtD (ORCPT ); Thu, 27 Mar 2014 03:49:03 -0400 In-Reply-To: <53333F73.709@ieee.org> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Alex Elder Cc: Ilya Dryomov , Ceph Development Le mercredi 26 mars 2014 =C3=A0 15:58 -0500, Alex Elder a =C3=A9crit : > Olivier reports that with the simple patch I provided > (which changed a "<" to a "!=3D" and removed an assertion) > he is running successfully. >=20 > To me this is fantastic news, and you can see I posted > a patch with the fix. >=20 > There remains a race condition though, one which I described > in a separate message earlier today. I don't think it will > prove to be a problem in practice, but I agreed to work on > a fix to ensure the race condition is eliminated. It will > require some work with reference counting image and object > requests. >=20 > The fix won't be coming today. But I aim to provide it > in a matter of several days. >=20 > -Alex >=20 One question from one of my customers : why am I the only one to complain about that problem ?=20 I know that Ceph users often use qemu/librbd instead of kernel client, but what is the trigger of those =C2=ABrace condition=C2=BB ? Having "m= ultiple requests" per RBD image ? It should be a normal use, no ? If someone can help me give an explanation, thanks :) Olivier -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html