From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48745) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z04oD-0007xw-5o for qemu-devel@nongnu.org; Wed, 03 Jun 2015 05:18:05 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z04o9-0007LW-3N for qemu-devel@nongnu.org; Wed, 03 Jun 2015 05:18:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59138) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z04o8-0007LF-UF for qemu-devel@nongnu.org; Wed, 03 Jun 2015 05:17:57 -0400 Date: Wed, 3 Jun 2015 10:17:54 +0100 From: Stefan Hajnoczi Message-ID: <20150603091754.GA17548@stefanha-thinkpad.redhat.com> References: <556DBF87.2020908@de.ibm.com> <556DC302.5090409@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="vtzGhvizbBRQ85DL" Content-Disposition: inline In-Reply-To: <556DC302.5090409@redhat.com> Subject: Re: [Qemu-devel] "iothread: release iothread around aio_poll" causes random hangs at startup List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: Kevin Wolf , Christian Borntraeger , qemu-devel --vtzGhvizbBRQ85DL Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 02, 2015 at 04:51:46PM +0200, Paolo Bonzini wrote: >=20 >=20 > On 02/06/2015 16:36, Christian Borntraeger wrote: > > commit a0710f7995f914e3044e5899bd8ff6c43c62f916 > > Author: Paolo Bonzini > > AuthorDate: Fri Feb 20 17:26:52 2015 +0100 > > Commit: Kevin Wolf > > CommitDate: Tue Apr 28 15:36:08 2015 +0200 > >=20 > > iothread: release iothread around aio_poll > >=20 > > to cause a problem with hanging guests. > >=20 > > Having many guests all with a kernel/ramdisk (via -kernel) and > > several null block devices will result in hangs. All hanging=20 > > guests are in partition detection code waiting for an I/O to return > > so very early maybe even the first I/O. > >=20 > > Reverting that commit "fixes" the hangs. > > Any ideas? >=20 > Stefan, please revert it as I will not have time to look at it until > well into 2.4 soft freeze. Ok Stefan --vtzGhvizbBRQ85DL Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJVbsZCAAoJEJykq7OBq3PIOg0IAKinNm5R49JRDa5g7L8fw8Jm NYsbU+KZTc/gYpvzK70HQlXpNCaZAnutz6xz+AJ26fOAguECPrxS20gSy92DfXo5 NmbfTPdlY0/kqfadQdnPdxhRGdWfeJDhdXmTD2YdWjlOC8Un/jZXyGE7WbLQnmI2 Q9v4M3Aotl7n6uxXCPm6/7Rwv1WhoxVhIxTmdKKGD9P2XCIMWIktKAiHgSN4PoLC lgXAtpFklO8Knm2cnp+BCFLCxik3qjGQSPTvrQlBxQSdXBQOXhInmjpm6KUXl/Z7 /NjzNiKFX4MMjjwBzBsVbRNTkIJ4AUtFUjxdsiMJhroGLrzMJ07tjmd8Qx4TR0M= =YNmC -----END PGP SIGNATURE----- --vtzGhvizbBRQ85DL--