Re: Index corruption

I trawled through the first, larger dump you sent me, and found multiple
index entries pointing to quite a few heap tuples:
Occurrences    block    item
2        43961    12        43961    22        43961    32        43961    42        43961    52        43961    62
  43961    72        43961    82        43961    92        119695    12        119695    22        119695    32
126029   12        126029    22        126029    32        166694    12        166865    12        166865    22
166865   32        166865    42        166865    52        166865    62        166865    72        206221    12
247123   12        327775    12        327775    22        327775    32        327775    42        327775    52
327775   62        327775    72        327775    82        327775    92        327775    102        327775    11
 

Both indexes show identical sets of duplicates, which makes it pretty
hard to credit that it's a within-index problem.

You mentioned that the test had been allowed to run for a good while
after the first slave error was noted.  So it seems there's no question
that we are looking at some mechanism that allows the first few entries
on a heap page to be lost and overwritten :-(, and that this happened
several times over the course of the larger run.
        regards, tom lane