Re: pg_dumpall failing from possible corrupted shared memory

Richard Broersma Jr <rabroersma@yahoo.com> writes:
>> Are you interested in dumping out the page of pg_index that
>> contains this record, using pg_filedump?

> I've attached the results.log to the email.

Well, there's our smoking gun:

 Item  11 -- Length:  398  Offset: 6844 (0x1abc)  Flags: USED
  XMIN: 940  CMIN: 0  XMAX: 0  CMAX|XVAC: 0
  Block Id: 1  linp Index: 11   Attributes: 10   Size: 32
  infomask: 0x0903 (HASNULL|HASVARWIDTH|XMIN_COMMITTED|XMAX_INVALID)
  t_bits: [0]: 0xff [1]: 0x01

  1abc: ac030000 00000000 00000000 00000000  ................
  1acc: 00000100 0b000a00 030920ff 01000000  .......... .....
  1adc: 5b380900 61410000 01000000 00000000  [8..aA..........
  1aec: 1a000000 01000000 00000000 15000000  ................
  1afc: 01000000 00000000 00000000 1c000000  ................
  1b0c: 01000000 00000000 1a000000 01000000  ................
  1b1c: 00000000 f7070000 26010000 287b4655  ........&...({FU
  1b2c: 4e434558 5052203a 66756e63 69642032  NCEXPR :funcid 2
  1b3c: 30323020 3a66756e 63726573 756c7474  020 :funcresultt
  1b4c: 79706520 31313134 203a6675 6e637265  ype 1114 :funcre
  1b5c: 74736574 2066616c 7365203a 66756e63  tset false :func
  1b6c: 666f726d 61742030 203a6172 67732028  format 0 :args (
  1b7c: 7b434f4e 5354203a 636f6e73 74747970  {CONST :consttyp
  1b8c: 65203235 203a636f 6e73746c 656e202d  e 25 :constlen -
  1b9c: 31203a63 6f6e7374 62797661 6c206661  1 :constbyval fa
  1bac: 6c736520 3a636f6e 73746973 6e756c6c  lse :constisnull
  1bbc: 2066616c 7365203a 636f6e73 7476616c   false :constval
  1bcc: 75652037 205b2037 20302030 20302031  ue 7 [ 7 0 0 0 1
  1bdc: 30302039 37203132 31205d7d 207b5641  00 97 121 ]} {VA
  1bec: 52203a76 61726e6f 2031203a 76617261  R :varno 1 :vara
  1bfc: 74746e6f 00000000 00000000 1c000000  ttno............
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
  1c0c: 01000000 00000000 1a000000 6d6f6420  ............mod
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
  1c1c: 2d31203a 7661726c 6576656c 73757020  -1 :varlevelsup
  1c2c: 30203a76 61726e6f 6f6c6420 31203a76  0 :varnoold 1 :v
  1c3c: 61726f61 74746e6f 20317d29 7d29      aroattno 1})})

The underlined stuff has overwritten what should be expression dump
text.

Seeing that the corruption begins at page offset 1c00 --- that is,
exactly on a 1K boundary --- I'm a bit inclined to suspect a disk
I/O glitch.  You might want to run some hardware diagnostics on
your machine.

            regards, tom lane