As we see in the diff above
if (ev >= 17) {
- decode(max_xattr_size, p);
+ decode(bal_rank_mask, p);
}
if (ev >= 18) {
- decode(bal_rank_mask, p);
+ decode(max_xattr_size, p);
+ }
+
these two decode() calls were swapped. Let's find out why.
To do so we need to clone the upstream repo and run git blame on the file to
see when and why the lines were changed:
> git clone https://github.com/ceph/ceph ceph-upstream
> cd ceph-upstream/
> git blame src/mds/MDSMap.cc
...
e134c8907013 (Yongseok Oh 2022-10-11 20:47:32 +0900 963) if (ev >= 17) {
78abfeaff27f (Patrick Donnelly 2024-02-15 10:28:32 -0500 964)
decode(bal_rank_mask, p);
36ee8e7ed365 (Venky Shankar 2023-12-01 04:32:20 -0500 965) }
36ee8e7ed365 (Venky Shankar 2023-12-01 04:32:20 -0500 966)
36ee8e7ed365 (Venky Shankar 2023-12-01 04:32:20 -0500 967) if (ev >= 18) {
78abfeaff27f (Patrick Donnelly 2024-02-15 10:28:32 -0500 968)
decode(max_xattr_size, p);
e134c8907013 (Yongseok Oh 2022-10-11 20:47:32 +0900 969) }
...
We see that both decode() functions where changed in the same commit. If
we look at it with
> git show 78abfeaff27f
we'll see that this is what we were looking for. A link to the commit:
https://github.com/ceph/ceph/commit/78abfeaff27fee343fb664db633de5b221699a73.
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https://bugs.launchpad.net/bugs/2089565
Title:
MON and MDS crash upgrading CEPH on ubuntu 24.04 LTS
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