Hi, I have run slapd in valgrind now, which produced following error: ==15353== 1 errors in context 1 of 5: ==15353== Invalid write of size 4 ==15353== at 0x80E64B5: slap_sl_free (sl_malloc.c:492) ==15353== by 0x80A0EEA: ch_free (ch_malloc.c:137) ==15353== by 0x80E3DC9: mra_free (mra.c:43) ==15353== by 0x80855B0: filter_free_x (filter.c:556) ==15353== by 0x80836CD: do_search (search.c:230) ==15353== by 0x8080588: connection_operation (connection.c:1109) ==15353== by 0x403B376: ldap_int_thread_pool_wrapper (tpool.c:685) ==15353== by 0x43046E4: start_thread (in /lib/libpthread-2.10.1.so) ==15353== by 0x43045FF: ??? (in /lib/libpthread-2.10.1.so) ==15353== Address 0x843692b1 is not stack'd, malloc'd or (recently) free'd Full valgrind log can be found at http://pastebin.de/6914 -Dieter