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Fix description of WAL record XLOG_BTREE_META_CLEANUP

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This record uses one metadata buffer and registers some data associated
to the buffer, but when parsing the record for its description a direct
access to the record data was done, but there is none.  This leads
usually to an incorrect description, but can also cause crashes like in
pg_waldump.  Instead, fix things so as the parsing uses the data
associated to the metadata block.

This is an oversight from 3d92796, so backpatch down to 11.

Author: Michael Paquier
Description: https://postgr.es/m/20190617013059.GA3153@paquier.xyz
Backpatch-through: 11
This commit is contained in:
Michael Paquier 2019-06-19 11:02:19 +09:00
parent 23224563d9
commit 3c28fd2281
1 changed files with 3 additions and 1 deletions
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4
src/backend/access/rmgrdesc/nbtdesc.c
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@ -97,8 +97,10 @@ btree_desc(StringInfo buf, XLogReaderState *record)
}
case XLOG_BTREE_META_CLEANUP:
{
xl_btree_metadata *xlrec = (xl_btree_metadata *) rec;
xl_btree_metadata *xlrec;
xlrec = (xl_btree_metadata *) XLogRecGetBlockData(record, 0,
NULL);
appendStringInfo(buf, "oldest_btpo_xact %u; last_cleanup_num_heap_tuples: %f",
xlrec->oldest_btpo_xact,
xlrec->last_cleanup_num_heap_tuples);