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Bug #55241
openrbd export complains about not existing snapshot and fails
Status:
Need More Info
Priority:
Normal
Assignee:
-
Target version:
-
% Done:
0%
Source:
Community (user)
Tags:
Backport:
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
rbd
Pull request ID:
Crash signature (v1):
Crash signature (v2):
Description
May be related to #18367 (which was closed due to lack of feedback), but not completly the same.
This fails:
# rbd --cluster ceph --pool triple export --export-format 2 vm-7010-disk-1 - > /dev/null error setting snapshot context: (2) No such file or directory Exporting image: 0% complete...failed. rbd: export error: (2) No such file or directory
No snapshots:
# rbd -p triple snap ls vm-7010-disk-1 #
But object-map is in ruins (which should not matter but maybe it does), also snapshot count is suspiciously one:
# rbd -p triple info vm-7010-disk-1
rbd image 'vm-7010-disk-1':
size 400 GiB in 102400 objects
order 22 (4 MiB objects)
snapshot_count: 1
id: b149126b8b4567
block_name_prefix: rbd_data.b149126b8b4567
format: 2
features: layering, exclusive-lock, object-map, fast-diff, operations
op_features: snap-trash
flags: object map invalid, fast diff invalid
create_timestamp: Wed Oct 16 14:47:11 2019
The beliefs of rados are:
# rados -p triple listomapvals rbd_header.b149126b8b4567 | more create_timestamp value (8 bytes) : 00000000 4f 11 a7 5d f9 2f bf 00 |O..]./..| 00000008 features value (8 bytes) : 00000000 1d 01 00 00 00 00 00 00 |........| 00000008 flags value (8 bytes) : 00000000 03 00 00 00 00 00 00 00 |........| 00000008 object_prefix value (27 bytes) : 00000000 17 00 00 00 72 62 64 5f 64 61 74 61 2e 62 31 34 |....rbd_data.b14| 00000010 39 31 32 36 62 38 62 34 35 36 37 |9126b8b4567| 0000001b op_features value (8 bytes) : 00000000 08 00 00 00 00 00 00 00 |........| 00000008 order value (1 bytes) : 00000000 16 |.| 00000001 size value (8 bytes) : 00000000 00 00 00 00 64 00 00 00 |....d...| 00000008 snap_seq value (8 bytes) : 00000000 99 da 01 00 00 00 00 00 |........| 00000008 snapshot_000000000001bca5 value (108 bytes) : 00000000 08 08 66 00 00 00 a5 bc 01 00 00 00 00 00 24 00 |..f...........$.| 00000010 00 00 65 61 33 34 39 32 65 62 2d 30 66 38 65 2d |..ea3492eb-0f8e-| 00000020 34 63 33 65 2d 38 61 33 66 2d 64 37 35 63 30 63 |4c3e-8a3f-d75c0c| 00000030 30 39 31 62 62 63 00 00 00 00 64 00 00 00 00 03 |091bbc....d.....| 00000040 00 00 00 00 00 00 00 01 01 12 00 00 00 02 00 00 |................| 00000050 00 06 00 00 00 76 7a 64 75 6d 70 00 00 00 00 d9 |.....vzdump.....| 00000060 2d 1f 62 7c 38 f7 13 00 00 00 00 00 |-.b|8.......| 0000006c
Unfortunately rebuilding object-map on a running vm isn't quote possible (mounted by krbd and updated, so rebuild loses lock faster than it could move on).
# rbd -v ceph version 16.2.7 (f9aa029788115b5df5eeee328f584156565ee5b7) pacific (stable)
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