(ITS#7121) back-mdb segfaults when splitting pages

[quanah]

Full_Name: Quanah Gibson-Mount
Version: 2.4.28
OS: Linux 2.6
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (75.108.184.39)


Back-mdb can segfault when doing page splits.