Can't allocate region- LDAP crashed.

Hi All, openLDAP crashed with the below error when I fired a search.

BDB version : 4.4.2 with 5 patches. OpenLDAP version : 2.3.39

== bdb_search: 510868 does not match filter slapd(5596,0x180d000) malloc: *** vm_allocate(size=8421376) failed (error code=3) slapd(5596,0x180d000) malloc: *** error: can't allocate region slapd(5596,0x180d000) malloc: *** set a breakpoint in szone_error to debug bdb(ou=groups,o=root): malloc: Cannot allocate memory: 1048 slapd(5596,0x180d000) malloc: *** vm_allocate(size=8421376) failed (error code=3) slapd(5596,0x180d000) malloc: *** error: can't allocate region slapd(5596,0x180d000) malloc: *** set a breakpoint in szone_error to debug ch_calloc of 1 elems of 832 bytes failed ch_malloc.c:107: failed assertion `0' Abort trap

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Any pointers how to fix this ?

Thanks, Sumith.