[Monotone-devel] Re: Invariant violation in server

[Peter Simons]

Jon Bright sent me instructions how to add debug code before
the invariant that fails. With it, the server produces the
following output now:

  fd 6 is armed
  i/o probe with 1 armed
  db.execute("BEGIN")
  processing 7 byte input buffer from peer 213.146.112.87:50191
  name delta netcmd, item type pos 0 str.size 43 len 1
  name delta netcmd, base identifier pos 1 str.size 43 len 20
  name delta netcmd, ident identifier pos 21 str.size 43 len 20
  name delta netcmd, compression flag pos 41 str.size 43 len 1
  name delta netcmd, delta payload pos 43 str.size 43 len 0
  netio.hh:32: invariant 'I(pos < str.size())' violated
  db.execute("ROLLBACK")

  *** Error: std::logic_error: netio.hh:32: invariant 'I(pos < str.size())' 
violated

So apparently, this is a problem with 0-byte deltas.

Anyhow, the good news is that I can reliably re-produce the
crash. :-)

Peter