iinvalid string enlargement PG 7.4.5

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi all,
this morning I perform an upgrade 7.4.2 -> 7.4.5 and
after 6 months without errors this night a backend
crashed:


ERROR:  invalid string enlargement request size 1476395004
DEBUG:  AbortCurrentTransaction
WARNING:  AbortTransaction and not in in-progress state
ERROR:  could not send data to client: Broken pipe
PANIC:  error during error recovery, giving up
DEBUG:  child process (PID 32247) was terminated by signal 6
LOG:  server process (PID 32247) was terminated by signal 6
LOG:  terminating any other active server processes


do you have any idea on what could be the reason ?

Regards
Gaetano Mendola







-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (MingW32)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFBNlh77UpzwH2SGd4RAqfoAJ4zEPgG/0Yr8YTKN+PpbYQvbU7TigCggQ+3
ie8oxH9jFgFDDMlZfNnKj4w=
=5epB
-----END PGP SIGNATURE-----