[OpenAFS] RHEL 7.5 beta / 3.10.0-830.el7.x86_66 kernel lock up

[Jeffrey Altman]

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On 2/5/2018 12:31 PM, Stephan Wiesand wrote:
> the usual way to use DKMS is to either have it build a module for a new=
ly
> installed kernel or install a prebuilt module for that kernel. It may b=
e
> possible to abuse it for providing a module built for another kernel, b=
ut
> I think that won't happen accidentally.
>=20
> You may be confusing DKMS with RHEL's "KABI tracking kmods". Those shou=
ld
> be safe to use within a RHEL minor release (and the SL packaging has be=
en
> using them like this since EL6.4), but aren't across minor releases (an=
d
> that's why the SL packaging modifies the kmod handling to require a bui=
ld
> for the minor release in question.

On RHEL DKMS and KABI are tightly related because of the way in which
Red Hat engineers back port feature and functionality changes.  During
mainline kernel development a change is likely to break an existing
interface.  Doing so is encouraged so that compilation errors will
identify where code modifications are required.

On RHEL there is a strong desire to maintain KABI compatibility.
Whenever possible, backports are altered to preserve the existing binary
interfaces at the risk of changing the interface semantics.  As a
result, compilation failures do not occur but semantic differences can
result in breakage for third party kernel modules that have not been
modified at the source level to be aware of the change.

The breakage of OpenAFS by RHEL 7.4 and 7.5 (minor releases) were both
due to back porting functionality in this manner.  Such
incompatibilities can result in system panics or silent data corruption
depending upon the change.

Jeffrey Altman
AuriStor, Inc.

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begin:vcard
fn:Jeffrey Altman
n:Altman;Jeffrey
org:AuriStor, Inc.
adr:Suite 6B;;255 West 94Th Street;New York;New York;10025-6985;United St=
ates
email;internet:jaltman@auristor.com
title:Founder and CEO
tel;work:+1-212-769-9018
note;quoted-printable:LinkedIn: https://www.linkedin.com/in/jeffreyaltman=
=3D0D=3D0A=3D
	Skype: jeffrey.e.altman=3D0D=3D0A=3D
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url:https://www.auristor.com/
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