Public bug reported: When mounting a ceph volume, mount operation fails with an IO error. The problem is always reproducible.
Identified potential root cause as kernel endian bug: In the function handle_session() variable @features always contains little endian order of bytes. Just because The feature mask sent by the MDS is little-endian (bits are packed bytewise from left to right in encode_supported_features()). However, test_bit(), called to check features availability, assumes the host order of bytes in that variable. This leads to problems on big endian architectures. Specifically it is impossible to mount ceph volume on s390. A fixup was proposed to convert little-endian order of bytes to the host one. That fixup was modified by ceph maintainers to use existing unpacking means for the conversion. The resulted patch attached. Related discussion in the ceph-development mailing list: https://marc.info/?l=ceph-devel&m=158815357301332&w=2 ** Affects: ceph (Ubuntu) Importance: Undecided Assignee: Skipper Bug Screeners (skipper-screen-team) Status: New ** Tags: architecture-s39064 bugnameltc-185690 severity-high targetmilestone-inin2004 ** Tags added: architecture-s39064 bugnameltc-185690 severity-high targetmilestone-inin2004 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1875863 Title: ceph -- Unable to mount ceph volume on s390x To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/1875863/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
