[OpenAFS] RE: [OpenAFS-announce] OpenAFS client crashes on RHEL 5.10 and RHEL 6.5

Fri, 07 Mar 2014 16:30:18 -0500

This is a cryptographically signed message in MIME format.

--------------ms080204080505090906020102
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

To the extent that Centos releases are slightly modified RHEL5 and RHEL6
releases rebranded, the behavior is the same.

On 3/7/2014 4:18 PM, Devine, Steven wrote:
> Is there any data on this behaviour on CentOS ?=20
>=20
> Steve Devine
> Michigan State University
>=20
>=20
> ________________________________________
> From: openafs-announce-admin@openafs.org [openafs-announce-admin@openaf=
s.org] on behalf of Andrew Deason [adeason@sinenomine.net]
> Sent: Friday, March 07, 2014 11:03 AM
> To: openafs-announce@openafs.org
> Cc: openafs-info@openafs.org
> Subject: [OpenAFS-announce] OpenAFS client crashes on RHEL 5.10 and RHE=
L 6.5
>=20
> It has been discovered that the OpenAFS client interacts poorly with a
> change to the Linux kernel introduced in Red Hat Enterprise Linux
> versions 5.10 and 6.5, which can cause a kernel panic with certain AFS
> access patterns. Sites may want to exercise caution when considering
> upgrading RHEL systems that are running OpenAFS clients.
>=20
> While the mechanism that is causing this problem is understood and a
> solution is being developed, fixing this issue is not straightforward
> and may take some time. In the meantime, without a fix in place, the
> following workarounds may help avoid encountering the issue:
>=20
>  - Avoid using multiple different mountpoints to access the same data,
>    since this can confuse the Linux VFS in some situations. This may be=

>    difficult to guarantee (since /afs/cellname and /afs/.cellname
>    usually exist), but it may be possible to reduce such mountpoint
>    usage in some scenarios.
>=20
>  - Avoid running the RHEL 5.10 kernel or the RHEL 6.5 kernel on machine=
s
>    with OpenAFS clients. However, these kernel updates contain stabilit=
y
>    and security fixes, so it may not be desirable to avoid upgrading
>    such machines running OpenAFS clients.
>=20
> Note that the RHEL 7 Beta is not affected by this issue, but it is not
> known if the final release of RHEL 7 will. No other distributions of
> Linux are known to be affected by this (except any that are derived fro=
m
> RHEL), and the problematic change to the Linux kernel is not in vanilla=

> upstream Linux kernel releases.
>=20
> If your site has a support contract with Red Hat, you may wish to
> inquire about this issue through your support channel. For reference,
> the issue was introduced in RHEL5 in kernel 2.6.18-367.el5 with this
> change:
>=20
>  - [fs] vfs: stop d_splice_alias creating directory aliases (J. Bruce F=
ields) [785916]
>=20
> and in RHEL6 in kernel 2.6.32-408.el6 with this change:
>=20
>  - [fs] vfs: stop d_splice_alias creating directory aliases (J. Bruce F=
ields) [820446]
>=20
> For more details and future updates on this issue, see this RT ticket:
> <https://rt.central.org/rt/Ticket/Display.html?id=3D130273&user=3Dguest=
&pass=3Dguest>
>=20
> --
> Andrew Deason
> adeason@sinenomine.net
> _______________________________________________
> OpenAFS-announce mailing list
> OpenAFS-announce@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-announce
> _______________________________________________
> OpenAFS-info mailing list
> OpenAFS-info@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-info
>=20

--------------ms080204080505090906020102
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature

MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIINITCC
BkIwggUqoAMCAQICEDirAC//rpa3Vv85Wvtd5xswDQYJKoZIhvcNAQEFBQAwgcoxCzAJBgNV
BAYTAlVTMRcwFQYDVQQKEw5WZXJpU2lnbiwgSW5jLjEfMB0GA1UECxMWVmVyaVNpZ24gVHJ1
c3QgTmV0d29yazE6MDgGA1UECxMxKGMpIDE5OTkgVmVyaVNpZ24sIEluYy4gLSBGb3IgYXV0
aG9yaXplZCB1c2Ugb25seTFFMEMGA1UEAxM8VmVyaVNpZ24gQ2xhc3MgMSBQdWJsaWMgUHJp
bWFyeSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eSAtIEczMB4XDTExMDkwMTAwMDAwMFoXDTIx
MDgzMTIzNTk1OVowgaYxCzAJBgNVBAYTAlVTMR0wGwYDVQQKExRTeW1hbnRlYyBDb3Jwb3Jh
dGlvbjEfMB0GA1UECxMWU3ltYW50ZWMgVHJ1c3QgTmV0d29yazEeMBwGA1UECxMVUGVyc29u
YSBOb3QgVmFsaWRhdGVkMTcwNQYDVQQDEy5TeW1hbnRlYyBDbGFzcyAxIEluZGl2aWR1YWwg
U3Vic2NyaWJlciBDQSAtIEc0MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxuwn
/R1j9DsdisHTHMjIgoa2uEqGkqqBXHLKMA0vnkEiVzAhJZCao/SsKsaIF4ZhchN2LuwDyyeb
jyCAN+DkitpVplAP/LlcI2mJQqG6H6/vDvmkyQrx+DeyxtmSSq5937hEH5u6P4wG/tgjT0hR
I2pghKjuJy9g35byGiqMPI8AzE/L+iCOvDX24fCatgXz/B0/xhR7DtryBeTTgwKmxWlwtKnk
VunbHVz0pjbia7UeKi3cvrvuOgSwMAitX2hsxr0GloiE5+apZC28ODC7iCbDZ2ZmtLR3+cCh
xw5y72bi5bnK4POFdzWY3tQcsP5mceI4y258T0BV65fZqBge7QIDAQABo4ICRDCCAkAwOAYI
KwYBBQUHAQEELDAqMCgGCCsGAQUFBzABhhxodHRwOi8vcGtpLW9jc3AudmVyaXNpZ24uY29t
MBIGA1UdEwEB/wQIMAYBAf8CAQAwbAYDVR0gBGUwYzBhBgtghkgBhvhFAQcXATBSMCYGCCsG
AQUFBwIBFhpodHRwOi8vd3d3LnN5bWF1dGguY29tL2NwczAoBggrBgEFBQcCAjAcGhpodHRw
Oi8vd3d3LnN5bWF1dGguY29tL3JwYTA0BgNVHR8ELTArMCmgJ6AlhiNodHRwOi8vY3JsLnZl
cmlzaWduLmNvbS9wY2ExLWczLmNybDAOBgNVHQ8BAf8EBAMCAQYwKQYDVR0RBCIwIKQeMBwx
GjAYBgNVBAMTEVZlcmlTaWduTVBLSS0yLTk3MB0GA1UdDgQWBBSt+cOTci21uShh5KTXYNXE
Cl4aATCB8QYDVR0jBIHpMIHmoYHQpIHNMIHKMQswCQYDVQQGEwJVUzEXMBUGA1UEChMOVmVy
aVNpZ24sIEluYy4xHzAdBgNVBAsTFlZlcmlTaWduIFRydXN0IE5ldHdvcmsxOjA4BgNVBAsT
MShjKSAxOTk5IFZlcmlTaWduLCBJbmMuIC0gRm9yIGF1dGhvcml6ZWQgdXNlIG9ubHkxRTBD
BgNVBAMTPFZlcmlTaWduIENsYXNzIDEgUHVibGljIFByaW1hcnkgQ2VydGlmaWNhdGlvbiBB
dXRob3JpdHkgLSBHM4IRAItbdVaEVIULAM+vOEjOsaQwDQYJKoZIhvcNAQEFBQADggEBANaP
wdqbiPKzbE0fWC+6AVFddMFG6MO4e5/WQPHv/zK6iWvADjRDn6SZ5qTwXUgzYoWFYf4jiCKM
YJsrnGVJlMSiOCRIpVylUEto6WIip5PomSJuPVu7EEIOH0x1RzRWCY/4vYw881y70pZwVHBi
Te/REL6dSCxe7IZrB4LwPeElJygs4BZ2HrP95WKW0oo9Xyuu+1zCE7dlY8s0dkOf1oeZq26t
lcEAP0Yngf813iMOQ9wUXzL5yinvwlIw9ZnduYH4OiUgjYJo8rkhhXRmBOGGORYy8i3WKqjJ
3tkAAk/jGCDFpYFWtpXe04Kt+HslvmR8LqC6cCz4+XXidE0HbYQwggbXMIIFv6ADAgECAhA5
oFEXaG88XscBgkTPSsu4MA0GCSqGSIb3DQEBBQUAMIGmMQswCQYDVQQGEwJVUzEdMBsGA1UE
ChMUU3ltYW50ZWMgQ29ycG9yYXRpb24xHzAdBgNVBAsTFlN5bWFudGVjIFRydXN0IE5ldHdv
cmsxHjAcBgNVBAsTFVBlcnNvbmEgTm90IFZhbGlkYXRlZDE3MDUGA1UEAxMuU3ltYW50ZWMg
Q2xhc3MgMSBJbmRpdmlkdWFsIFN1YnNjcmliZXIgQ0EgLSBHNDAeFw0xMzEyMjMwMDAwMDBa
Fw0xNTAxMTYyMzU5NTlaMIHOMS4wLAYDVQQDDCVQZXJzb25hIE5vdCBWYWxpZGF0ZWQgLSAx
MzU4Mjc1NTk5Njg2MSswKQYJKoZIhvcNAQkBFhxqYWx0bWFuQHNlY3VyZS1lbmRwb2ludHMu
Y29tMQ8wDQYDVQQLDAZTL01JTUUxHjAcBgNVBAsMFVBlcnNvbmEgTm90IFZhbGlkYXRlZDEf
MB0GA1UECwwWU3ltYW50ZWMgVHJ1c3QgTmV0d29yazEdMBsGA1UECgwUU3ltYW50ZWMgQ29y
cG9yYXRpb24wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCtcVgrUA+Zl527P0yx
xfkiLZzymUZLAwif9amX6c79OHd17CN5Hg3TIRXi0exjq/z/K2eftbSfj3XatgllPtlmCktq
i4daJTVLifx5G7qbcYjQgKpex/8FA3gfvJJNgMef5OwOTE1HqMJsp5CAquFjw/ReiXQqduou
1nHhUhX1AXBpaQmYDOQZwrTD41yT7qm22N67vV0viWG9x/1RdFqqtIOIyKR+ojD3IN0wufES
gy7hsWgmghh4jkrclmMIXuo+AAtmJHzwzF4hCrSqdwiRXU4aghTjsmehtMT1nFfzDPylaclO
p7IY4xeQm/q1cbU3uEqxhy06sYeVbh6zfTDBAgMBAAGjggLVMIIC0TAMBgNVHRMBAf8EAjAA
MA4GA1UdDwEB/wQEAwIFoDAgBgNVHSUBAf8EFjAUBggrBgEFBQcDBAYIKwYBBQUHAwIwHQYD
VR0OBBYEFLNBzIZb/xB6K+oeDwfBVLaB3qbUMCcGA1UdEQQgMB6BHGphbHRtYW5Ac2VjdXJl
LWVuZHBvaW50cy5jb20wHwYDVR0jBBgwFoAUrfnDk3IttbkoYeSk12DVxApeGgEwggErBggr
BgEFBQcBAQSCAR0wggEZMIIBFQYIKwYBBQUHMAKGggEHbGRhcDovL2RpcmVjdG9yeS52ZXJp
c2lnbi5jb20vQ04lMjAlM0QlMjBTeW1hbnRlYyUyMENsYXNzJTIwMSUyMEluZGl2aWR1YWwl
MjBTdWJzY3JpYmVyJTIwQ0ElMjAtJTIwRzQlMkMlMjBPVSUyMCUzRCUyMFBlcnNvbmElMjBO
b3QlMjBWYWxpZGF0ZWQlMkMlMjBPVSUyMCUzRCUyMFN5bWFudGVjJTIwVHJ1c3QlMjBOZXR3
b3JrJTJDJTIwTyUyMCUzRCUyMFN5bWFudGVjJTIwQ29ycG9yYXRpb24lMkMlMjBDJTIwJTNE
JTIwVVM/Y0FDZXJ0aWZpY2F0ZTtiaW5hcnkwXQYDVR0fBFYwVDBSoFCgToZMaHR0cDovL3Br
aS1jcmwuc3ltYXV0aC5jb20vY2FfNTYxYzEwMzY5MGM5N2E2OTI0N2EwZWYwNzFhYzgxYWYv
TGF0ZXN0Q1JMLmNybDBsBgNVHSAEZTBjMGEGC2CGSAGG+EUBBxcBMFIwJgYIKwYBBQUHAgEW
Gmh0dHA6Ly93d3cuc3ltYXV0aC5jb20vY3BzMCgGCCsGAQUFBwICMBwaGmh0dHA6Ly93d3cu
c3ltYXV0aC5jb20vcnBhMCoGCmCGSAGG+EUBEAMEHDAaBhFghkgBhvhFARABAgIEAYazFxYF
MTA5MjIwDQYJKoZIhvcNAQEFBQADggEBAACPkJV5NIxzjKc+WveaoM8Uc86wX0yLBm1A33z4
rLVXTWPi5kMIJ6kfE+dFWcMdyyOgZ2VcxIwneZ50LcITFv1VOfRkrX32vVChQqs8XGqerIo/
K3epyFEg01qHq/4byolXW6UOvmZb3oHhtHDGS94Vv6Fu6wV7irAdoM18cqzQsxU0nZDMnY5k
0pKJHLTrsC/uKuoWGz8xLLyeayi37ZsXsbGdazqzVMIoLvFTMjaFuoCetEbiFQZvnuHKwdbV
YqyCY28Cl8DVRHrInZrz84xqFiGZNSfFRWOougT47VRDA8SVy6pOtDaOmkxcYXlh5Ezo29FB
OiA0+tF8qgMmq3QxggRSMIIETgIBATCBuzCBpjELMAkGA1UEBhMCVVMxHTAbBgNVBAoTFFN5
bWFudGVjIENvcnBvcmF0aW9uMR8wHQYDVQQLExZTeW1hbnRlYyBUcnVzdCBOZXR3b3JrMR4w
HAYDVQQLExVQZXJzb25hIE5vdCBWYWxpZGF0ZWQxNzA1BgNVBAMTLlN5bWFudGVjIENsYXNz
IDEgSW5kaXZpZHVhbCBTdWJzY3JpYmVyIENBIC0gRzQCEDmgURdobzxexwGCRM9Ky7gwCQYF
Kw4DAhoFAKCCAmswGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcN
MTQwMzA3MjEzMDE4WjAjBgkqhkiG9w0BCQQxFgQU1uhrKVHKiHq47f3jMybtqc3D33owbAYJ
KoZIhvcNAQkPMV8wXTALBglghkgBZQMEASowCwYJYIZIAWUDBAECMAoGCCqGSIb3DQMHMA4G
CCqGSIb3DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKDCB
zAYJKwYBBAGCNxAEMYG+MIG7MIGmMQswCQYDVQQGEwJVUzEdMBsGA1UEChMUU3ltYW50ZWMg
Q29ycG9yYXRpb24xHzAdBgNVBAsTFlN5bWFudGVjIFRydXN0IE5ldHdvcmsxHjAcBgNVBAsT
FVBlcnNvbmEgTm90IFZhbGlkYXRlZDE3MDUGA1UEAxMuU3ltYW50ZWMgQ2xhc3MgMSBJbmRp
dmlkdWFsIFN1YnNjcmliZXIgQ0EgLSBHNAIQOaBRF2hvPF7HAYJEz0rLuDCBzgYLKoZIhvcN
AQkQAgsxgb6ggbswgaYxCzAJBgNVBAYTAlVTMR0wGwYDVQQKExRTeW1hbnRlYyBDb3Jwb3Jh
dGlvbjEfMB0GA1UECxMWU3ltYW50ZWMgVHJ1c3QgTmV0d29yazEeMBwGA1UECxMVUGVyc29u
YSBOb3QgVmFsaWRhdGVkMTcwNQYDVQQDEy5TeW1hbnRlYyBDbGFzcyAxIEluZGl2aWR1YWwg
U3Vic2NyaWJlciBDQSAtIEc0AhA5oFEXaG88XscBgkTPSsu4MA0GCSqGSIb3DQEBAQUABIIB
AEvkCuQhG0s9j6feEvYN/TGU2ga1B32bPGl4IdW6oeSVqlZyxZ0YrbY2WOIucftH3re+VlJr
8qFdViJ6hLxtQ8Eq8hm0TgiPbeI1ZcTkMSc7kRib+QI4xPiDfxndwkS528y3+yrDFOZ3hBgS
90JFuPc8zh8Gexdj8svauWAKnETZmb6BlLy2ZsemH2+L6IF20DR/0kHubsemeeJz43TmW9OX
640sGS2s/4NWb8Im23lFI266/U28+SgVMLPk/JcmohVIvtxP2j2RexwzeugrGExn/OcWondH
KpIZBEb51zAw88CYCVLDGGIJerkKMhphNnYvHNbigmw1BAYx8jO8fWMAAAAAAAA=
--------------ms080204080505090906020102--