Illegal key len error, Corrupted data page on migration from 7.3 to 7.5

[Thorn Roby]

I migrated a 7.3 database to a hot standby running 7.4.30. The initial 
full restore was successful, with the exception of some bad indices 
which were deleted and successfully recreated. However, due to problems 
with restoring later logfiles described in a separate posting, I decided 
to upgrade the hot standby from 7.4 to 7.5. Now when performing the full 
restore I get this error on a database structure check:

2004-01-29 13:17:10    13 ERR 53370 B*TREE   Illegal key len length: 123
2004-01-29 13:17:10    13 ERR 53370 B*TREE   Corrupted data page: 284
2004-01-29 13:17:10    13 ERR 53000 B*TREE 030600000000000002CD000000000000
2004-01-29 13:17:10    13 ERR 53000 B*TREE   ROOT  34659
2004-01-29 13:17:10    13 ERR 53250 B*TREE   BAD INDEX 34659 (ROOT)
2004-01-29 13:17:10    12 ERR 53019 CHECK    Base error: file_not_accessibl
2004-01-29 13:17:10    12 ERR 53019 CHECK    Root pageNo: 34659
2004-01-29 13:24:43    12 ERR 53000 CHECK    Check data finished 
unsuccessfully

The error is the same for my original migration backup that was 
successfully restored to 7.4, and a fresh migration backup done to avoid 
the log restore problem.

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