On Sun, Feb 9, 2014 at 2:54 PM, Greg Stark <stark@mit.edu> wrote:
> Bad block's page header -- this is in the 56'th relation segment:
>
> =# select
(page_header(E'\\x20050000583b05aa050000002800180500200420000000001098e00f2090e00f088d24061885e00f0000000000000000')).*;
> lsn | tli | flags | lower | upper | special | pagesize |
> version | prune_xid
> --------------+-----+-------+-------+-------+---------+----------+---------+-----------
> 520/AA053B58 | 5 | 0 | 40 | 1304 | 8192 | 8192 |
> 4 | 0
> Looking at the block at offset 4773121 (which is in the 36th segment):
...
> d9de7pcqls4ib6=# select
>
(page_header(E'\\x20050000a00a0bad050000002c00a00200200420000000001098e00f2090e00f088d24061885e00fa082ec040000000000000000....')).*;
> lsn | tli | flags | lower | upper | special | pagesize |
> version | prune_xid
> --------------+-----+-------+-------+-------+---------+----------+---------+-----------
> 520/AD0B0AA0 | 5 | 0 | 44 | 672 | 8192 | 8192 |
> 4 | 0
> (1 row)
And I finally tracked down the xlog record for this stray write:
[cur:520/AA051FE0, xid:7635428, rmid:10(Heap), len/tot_len:21/7005,
info:8, prev:520/AA051F20] insert: s/d/r:1663/16385/16650
blk/off:4773121/4 header: none
[cur:520/AA051FE0, xid:7635428, rmid:10(Heap), len/tot_len:21/7005,
info:8, prev:520/AA051F20] bkpblock[1]: s/d/r:1663/16385/16650
blk:4773121 hole_off/len:40/1264
--
greg