Hi Andrew, we opened a ticket with RedHat, but it is not clear how to proceed....are you thinking that we should be asking them for a fix?
Thanks, Renata On Fri, 7 Mar 2014, Andrew Deason wrote: >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. > >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: > > - 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. > > - Avoid running the RHEL 5.10 kernel or the RHEL 6.5 kernel on machines > with OpenAFS clients. However, these kernel updates contain stability > and security fixes, so it may not be desirable to avoid upgrading > such machines running OpenAFS clients. > >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 from >RHEL), and the problematic change to the Linux kernel is not in vanilla >upstream Linux kernel releases. > >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: > > - [fs] vfs: stop d_splice_alias creating directory aliases (J. Bruce Fields) > [785916] > >and in RHEL6 in kernel 2.6.32-408.el6 with this change: > > - [fs] vfs: stop d_splice_alias creating directory aliases (J. Bruce Fields) > [820446] > >For more details and future updates on this issue, see this RT ticket: ><https://rt.central.org/rt/Ticket/Display.html?id=130273&user=guest&pass=guest> > >-- >Andrew Deason >adea...@sinenomine.net >_______________________________________________ >OpenAFS-info mailing list >OpenAFS-info@openafs.org >https://lists.openafs.org/mailman/listinfo/openafs-info > _______________________________________________ OpenAFS-info mailing list OpenAFS-info@openafs.org https://lists.openafs.org/mailman/listinfo/openafs-info