From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f180.google.com ([209.85.213.180]:38485 "EHLO mail-ig0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752107AbbLDNJf (ORCPT ); Fri, 4 Dec 2015 08:09:35 -0500 Received: by igbxm8 with SMTP id xm8so36148363igb.1 for ; Fri, 04 Dec 2015 05:09:35 -0800 (PST) Subject: Re: 3.16.0 Debian kernel hang To: Russell Coker , linux-btrfs@vger.kernel.org References: <201512042100.58127.russell@coker.com.au> From: Austin S Hemmelgarn Message-ID: <5661906A.50309@gmail.com> Date: Fri, 4 Dec 2015 08:08:58 -0500 MIME-Version: 1.0 In-Reply-To: <201512042100.58127.russell@coker.com.au> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms020804070107020508020904" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms020804070107020508020904 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-12-04 05:00, Russell Coker wrote: > One of my test laptops started hanging on mounting the root filesystem.= I > think that it had experience an unexpected power outage prior to that w= hich > may have caused corruption. > > When I tried to mount the root filesystem the mount process would stick= in D > state, there would be no disk IO, and the computer would get hot - pres= umably > due to kernel CPU use even though "top" didn't seem to indicate that. > > When I mounted the filesystem with a 4.2.0 kernel it said "The free spa= ce cache > file (1103101952) is invalid, skip it" and then things worked. Now tha= t the > machine is running 4.2.0 everything is fine. > > I know that there are no plans to backport things to 3.16 and I don't t= hink > the Debian people are going to be very interested in this. So this mes= sage is > a FYI for users, maybe consider not using the Debian/Jessie kernel for = BTRFS > systems. > I'd suggest extending that suggestion to: If you're not using an Enterprise distro (RHEL, SLES, CentOS, OEL), then = you should probably be building your own kernel, ideally using upstream=20 sources. Ubuntu is notorious for picking 'stable' kernels that then fail to be=20 marked by kernel.org as LTS, Debian picks kernels that are multiple=20 versions old by the time they make a release, and I've heard similar=20 from other non-enterprise distros that don't inherently make you build=20 your own kernel. Even among ones that you have to build the kernel=20 yourself anyway, there are issues (Gentoo for example doesn't often mark = new kernels as stable, even when they are perfectly usable for pretty=20 much everyone). --------------ms020804070107020508020904 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC Brgwgga0MIIEnKADAgECAgMRLfgwDQYJKoZIhvcNAQENBQAweTEQMA4GA1UEChMHUm9vdCBD QTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNp Z25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcwHhcN MTUwOTIxMTEzNTEzWhcNMTYwMzE5MTEzNTEzWjBjMRgwFgYDVQQDEw9DQWNlcnQgV29UIFVz ZXIxIzAhBgkqhkiG9w0BCQEWFGFoZmVycm9pbjdAZ21haWwuY29tMSIwIAYJKoZIhvcNAQkB FhNhaGVtbWVsZ0BvaGlvZ3QuY29tMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA nQ/81tq0QBQi5w316VsVNfjg6kVVIMx760TuwA1MUaNQgQ3NyUl+UyFtjhpkNwwChjgAqfGd LIMTHAdObcwGfzO5uI2o1a8MHVQna8FRsU3QGouysIOGQlX8jFYXMKPEdnlt0GoQcd+BtESr pivbGWUEkPs1CwM6WOrs+09bAJP3qzKIr0VxervFrzrC5Dg9Rf18r9WXHElBuWHg4GYHNJ2V Ab8iKc10h44FnqxZK8RDN8ts/xX93i9bIBmHnFfyNRfiOUtNVeynJbf6kVtdHP+CRBkXCNRZ qyQT7gbTGD24P92PS2UTmDfplSBcWcTn65o3xWfesbf02jF6PL3BCrVnDRI4RgYxG3zFBJuG qvMoEODLhHKSXPAyQhwZINigZNdw5G1NqjXqUw+lIqdQvoPijK9J3eijiakh9u2bjWOMaleI SMRR6XsdM2O5qun1dqOrCgRkM0XSNtBQ2JjY7CycIx+qifJWsRaYWZz0aQU4ZrtAI7gVhO9h pyNaAGjvm7PdjEBiXq57e4QcgpwzvNlv8pG1c/hnt0msfDWNJtl3b6elhQ2Pz4w/QnWifZ8E BrFEmjeeJa2dqjE3giPVWrsH+lOvQQONsYJOuVb8b0zao4vrWeGmW2q2e3pdv0Axzm/60cJQ haZUv8+JdX9ZzqxOm5w5eUQSclt84u+D+hsCAwEAAaOCAVkwggFVMAwGA1UdEwEB/wQCMAAw VgYJYIZIAYb4QgENBEkWR1RvIGdldCB5b3VyIG93biBjZXJ0aWZpY2F0ZSBmb3IgRlJFRSBo ZWFkIG92ZXIgdG8gaHR0cDovL3d3dy5DQWNlcnQub3JnMA4GA1UdDwEB/wQEAwIDqDBABgNV HSUEOTA3BggrBgEFBQcDBAYIKwYBBQUHAwIGCisGAQQBgjcKAwQGCisGAQQBgjcKAwMGCWCG SAGG+EIEATAyBggrBgEFBQcBAQQmMCQwIgYIKwYBBQUHMAGGFmh0dHA6Ly9vY3NwLmNhY2Vy dC5vcmcwMQYDVR0fBCowKDAmoCSgIoYgaHR0cDovL2NybC5jYWNlcnQub3JnL3Jldm9rZS5j cmwwNAYDVR0RBC0wK4EUYWhmZXJyb2luN0BnbWFpbC5jb22BE2FoZW1tZWxnQG9oaW9ndC5j b20wDQYJKoZIhvcNAQENBQADggIBADMnxtSLiIunh/TQcjnRdf63yf2D8jMtYUm4yDoCF++J jCXbPQBGrpCEHztlNSGIkF3PH7ohKZvlqF4XePWxpY9dkr/pNyCF1PRkwxUURqvuHXbu8Lwn 8D3U2HeOEU3KmrfEo65DcbanJCMTTW7+mU9lZICPP7ZA9/zB+L0Gm1UNFZ6AU50N/86vjQfY WgkCd6dZD4rQ5y8L+d/lRbJW7ZGEQw1bSFVTRpkxxDTOwXH4/GpQfnfqTAtQuJ1CsKT12e+H NSD/RUWGTr289dA3P4nunBlz7qfvKamxPymHeBEUcuICKkL9/OZrnuYnGROFwcdvfjGE5iLB kjp/ttrY4aaVW5EsLASNgiRmA6mbgEAMlw3RwVx0sVelbiIAJg9Twzk4Ct6U9uBKiJ8S0sS2 8RCSyTmCRhJs0vvva5W9QUFGmp5kyFQEoSfBRJlbZfGX2ehI2Hi3U2/PMUm2ONuQG1E+a0AP u7I0NJc/Xil7rqR0gdbfkbWp0a+8dAvaM6J00aIcNo+HkcQkUgtfrw+C2Oyl3q8IjivGXZqT 5UdGUb2KujLjqjG91Dun3/RJ/qgQlotH7WkVBs7YJVTCxfkdN36rToPcnMYOI30FWa0Q06gn F6gUv9/mo6riv3A5bem/BdbgaJoPnWQD9D8wSyci9G4LKC+HQAMdLmGoeZfpJzKHMYIE0TCC BM0CAQEwgYAweTEQMA4GA1UEChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNl cnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcN AQkBFhJzdXBwb3J0QGNhY2VydC5vcmcCAxEt+DANBglghkgBZQMEAgMFAKCCAiEwGAYJKoZI hvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMTUxMjA0MTMwODU4WjBPBgkq hkiG9w0BCQQxQgRA0v5DJKbkCTIqitySrrLdwlPJAJVfbfJxm+eti7RqwS+Nd1XzuKvcBasv WSHud+vV921w9SNtPK7Wsqs4GCV8NTBsBgkqhkiG9w0BCQ8xXzBdMAsGCWCGSAFlAwQBKjAL BglghkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFA MAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIGRBgkrBgEEAYI3EAQxgYMwgYAweTEQMA4GA1UE ChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlD QSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy dC5vcmcCAxEt+DCBkwYLKoZIhvcNAQkQAgsxgYOggYAweTEQMA4GA1UEChMHUm9vdCBDQTEe MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNpZ25p bmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcCAxEt+DAN BgkqhkiG9w0BAQEFAASCAgAvc1fSpI5sr10KkQYAyMyuxAX2ECDJXEFkTbEscSQL4X0dhyN+ rLJBzP1Zl2YRcY8o2EAk+j2/EGM/qgN/yYcdPAisY3B2DJ1L4KPqnKC58p1cTDNJvG+2malF ERO5BAvBuJIZi1dO1BElhSUhCpp1SYbefM/0xKHi5UUSX7O0Q27iYEWBc5l5Rfmy8PVYQNw+ 5sjoHUiXPFWpr8MEFhnKwJwC4+o9V9gNdoFrt9CETGLZmGmssayOF565httu1UD4+hfwiHNq zmtHVOARB9FYMD68TQmGzkPmS9N4LxKZSb2imbgDvj6gb4/yjAifwej7GrVyoovHLTBANkwN c9rzY9WYhuIVFQbdfxffaBjCqU+oOYT3vghIhJhyTaT38WEY8wzHfwTbald2YX8lIxOipC+G lGdUWi21YY++hRmhe0Dgd3ghnAL2DfeK7YZ5VlfFIlvLvX9LjwHWvAdBDf2yVzlcpQDT8a7c WV+C7qQSMHDIoI/K4/VhOnIgsykFByUnFIWUZITETNn2Ng4XolVXY2VyPWGowWDfX5lMHwlZ 6kQIrc2WO015pAojFFsAHb0u6UgejNADavbKau2rj2qS45UBAbNJdXuWzTA0b7FpwYFxokhG zME7Dp8f5UP5P2CxlQoOB33NgY9STL9t32Q9qslwe65I7FisxuidYHTKLwAAAAAAAA== --------------ms020804070107020508020904--