Invalid pages in WAL

I've had a private report of these error messages in a test of Hot
Standby, but IMHO these aren't related to that patch. It seems more
likely to be related to the new VACUUM code? Certainly hot standby does
nothing to the normal flow of existing WAL records.

LOG: database system was interrupted; last known up at 2008-12-16
12:56:57 EST
LOG: database system was not properly shut down; automatic recovery in
progress
LOG: redo starts at 0/655A68
LOG: record with zero length at 0/658150
LOG: redo done at 0/658080
WARNING: page 35 of relation base/11517/1249 did not exist
WARNING: page 32 of relation base/11517/1249 did not exist
WARNING: page 33 of relation base/11517/1249 did not exist
WARNING: page 34 of relation base/11517/1249 did not exist
PANIC: WAL contains references to invalid pages

The WAL record was destroyed before it could be analysed, so we can't do
much for now.

Ideas please?

--
Simon Riggs www.2ndQuadrant.com
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