| 2020-04-29 11:00:16 |
bugproxy |
bug |
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added bug |
| 2020-04-29 11:00:19 |
bugproxy |
tags |
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architecture-s39064 bugnameltc-185690 severity-high targetmilestone-inin2004 |
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| 2020-04-29 11:00:20 |
bugproxy |
attachment added |
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Kernel messages related to failed mount operation on the client machine https://bugs.launchpad.net/bugs/1875863/+attachment/5363442/+files/ceph-mount-failure-messages.txt |
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| 2020-04-29 11:00:22 |
bugproxy |
attachment added |
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Proposed fixup https://bugs.launchpad.net/bugs/1875863/+attachment/5363443/+files/ceph-fix-up-endian-bug-in-managing-feature-bits.eml |
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| 2020-04-29 11:00:25 |
bugproxy |
ubuntu: assignee |
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Skipper Bug Screeners (skipper-screen-team) |
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| 2020-04-29 11:00:29 |
bugproxy |
affects |
ubuntu |
ceph (Ubuntu) |
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| 2020-04-29 11:51:47 |
Frank Heimes |
bug task added |
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ubuntu-z-systems |
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| 2020-04-29 11:51:57 |
Frank Heimes |
ubuntu-z-systems: importance |
Undecided |
High |
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| 2020-04-29 11:52:44 |
Frank Heimes |
ubuntu-z-systems: assignee |
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Ubuntu OpenStack (ubuntu-openstack) |
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| 2020-04-29 11:55:11 |
Frank Heimes |
tags |
architecture-s39064 bugnameltc-185690 severity-high targetmilestone-inin2004 |
architecture-s39064 bugnameltc-185690 openstack-ibm severity-high targetmilestone-inin2004 |
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| 2020-04-29 13:50:11 |
Frank Heimes |
ubuntu-z-systems: status |
New |
Incomplete |
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| 2020-04-29 15:24:36 |
James Page |
bug task added |
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linux (Ubuntu) |
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| 2020-04-29 15:24:42 |
James Page |
ceph (Ubuntu): status |
New |
Invalid |
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| 2020-04-30 06:54:23 |
Frank Heimes |
ubuntu-z-systems: assignee |
Ubuntu OpenStack (ubuntu-openstack) |
Skipper Bug Screeners (skipper-screen-team) |
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| 2020-04-30 06:54:36 |
Frank Heimes |
linux (Ubuntu): assignee |
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Canonical Kernel Team (canonical-kernel-team) |
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| 2020-04-30 06:54:44 |
Frank Heimes |
bug task deleted |
ceph (Ubuntu) |
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| 2020-04-30 06:55:22 |
Frank Heimes |
linux (Ubuntu): importance |
Undecided |
High |
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| 2020-04-30 19:31:21 |
Ulrich Weigand |
bug |
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added subscriber Ulrich Weigand |
| 2020-05-11 09:05:48 |
Frank Heimes |
linux (Ubuntu): status |
New |
In Progress |
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| 2020-05-11 09:05:53 |
Frank Heimes |
ubuntu-z-systems: status |
Incomplete |
In Progress |
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| 2020-05-13 08:12:52 |
Frank Heimes |
linux (Ubuntu): status |
In Progress |
Fix Committed |
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| 2020-05-13 08:12:55 |
Frank Heimes |
ubuntu-z-systems: status |
In Progress |
Fix Committed |
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| 2020-05-13 10:05:05 |
Frank Heimes |
nominated for series |
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Ubuntu Groovy |
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| 2020-05-13 10:05:05 |
Frank Heimes |
bug task added |
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linux (Ubuntu Groovy) |
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| 2020-05-13 10:05:05 |
Frank Heimes |
nominated for series |
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Ubuntu Focal |
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| 2020-05-13 10:05:05 |
Frank Heimes |
bug task added |
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linux (Ubuntu Focal) |
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| 2020-05-13 10:05:14 |
Frank Heimes |
linux (Ubuntu Groovy): status |
Fix Committed |
In Progress |
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| 2020-05-13 10:05:20 |
Frank Heimes |
linux (Ubuntu Focal): status |
New |
In Progress |
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| 2020-05-13 14:49:24 |
Frank Heimes |
description |
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 |
SRU Justification:
==================
[Impact]
* Unable to mount ceph volumes on big endian systems, like s390x.
* The mount operation always fails with an IO error.
* This is caused by an endiness issue in function handle_session where variable features is always little endian.
* But test_bit assumes the host order of bytes, hence causes a problem on big endian systems.
[Fix]
* 0fa8263367db9287aa0632f96c1a5f93cc478150 0fa8263367db "ceph: fix endianness bug when handling MDS session feature bits"
[Test Case]
* Setup ceph on s390x.
* Try to mount a ceph volume.
* If it mounts correctly the patch is applied and working.
* Without the patch a mount always fails on big endian / s390x.
[Regression Potential]
* There is regression potential with having code changes in ceph's session handler, which is common code.
* However, the patch was accepted (slightly changed) by the ceph maintainers and with that got upstream accepted, too.
* The patch is fairly limited (5 lines removed, 3 added), hence the changes are quite traceable.
__________
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 |
|
| 2020-05-14 03:59:07 |
Khaled El Mously |
linux (Ubuntu Focal): status |
In Progress |
Fix Committed |
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| 2020-05-14 05:15:43 |
Frank Heimes |
linux (Ubuntu Focal): assignee |
|
Canonical Kernel Team (canonical-kernel-team) |
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| 2020-05-19 14:32:34 |
Ubuntu Kernel Bot |
tags |
architecture-s39064 bugnameltc-185690 openstack-ibm severity-high targetmilestone-inin2004 |
architecture-s39064 bugnameltc-185690 openstack-ibm severity-high targetmilestone-inin2004 verification-needed-focal |
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| 2020-05-25 15:09:44 |
bugproxy |
tags |
architecture-s39064 bugnameltc-185690 openstack-ibm severity-high targetmilestone-inin2004 verification-needed-focal |
architecture-s39064 bugnameltc-185690 openstack-ibm severity-high targetmilestone-inin2004 verification-failed-focal |
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| 2020-06-08 09:09:15 |
Frank Heimes |
tags |
architecture-s39064 bugnameltc-185690 openstack-ibm severity-high targetmilestone-inin2004 verification-failed-focal |
architecture-s39064 bugnameltc-185690 openstack-ibm severity-high targetmilestone-inin2004 verification-done-focal |
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| 2020-06-09 21:04:04 |
Launchpad Janitor |
linux (Ubuntu Focal): status |
Fix Committed |
Fix Released |
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| 2020-06-09 21:04:04 |
Launchpad Janitor |
cve linked |
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2020-0543 |
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| 2020-07-28 00:57:39 |
Launchpad Janitor |
linux (Ubuntu Groovy): status |
In Progress |
Fix Released |
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| 2020-07-28 00:57:39 |
Launchpad Janitor |
cve linked |
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2019-16089 |
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| 2020-07-28 00:57:39 |
Launchpad Janitor |
cve linked |
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2019-19642 |
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| 2020-07-28 00:57:39 |
Launchpad Janitor |
cve linked |
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2020-11935 |
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| 2020-07-28 05:52:04 |
Frank Heimes |
ubuntu-z-systems: status |
Fix Committed |
Fix Released |
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