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(ITS#6892) Segfault in Syncprov overlay

Full_Name: Duncan Idaho
Version: 2.4.25
OS: RHEL 5.5
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

In my configuration slapd segfaults within a few hours repeatably when a NULL
value is somehow passed as a filter to test_filter in the syncprov overlay.

I'm running "threads 64" as I have 62 consumers connecting and this was required
to prevent unrelated searches from timing out when all the consumers connect at

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x59832940 (LWP 2042)]
test_filter (op=0x59830770, e=0x2aab11861068, f=0x0) at filterentry.c:69
69              if ( f->f_choice & SLAPD_FILTER_UNDEFINED ) {
(gdb) bt
#0  test_filter (op=0x59830770, e=0x2aab11861068, f=0x0) at filterentry.c:69
#1  0x00000000004db315 in syncprov_matchops (op=0x59831130, opc=0xbc91750,
saveit=1) at syncprov.c:1314
#2  0x00000000004db6b5 in syncprov_op_mod (op=0x59831130, rs=<value optimized
out>) at syncprov.c:2124
#3  0x000000000047e62a in overlay_op_walk (op=0x59831130, rs=0x59830f40,
which=op_modify, oi=0x8d7b50, on=0x8dc540) at backover.c:659
#4  0x000000000047ec07 in over_op_func (op=0x59831130, rs=0x59830f40,
which=op_modify) at backover.c:721
#5  0x000000000047404d in syncrepl_updateCookie (si=0x8d74e0, op=0x59831130,
syncCookie=0x59831aa0) at syncrepl.c:3292
#6  0x0000000000479d0d in do_syncrep2 (ctx=<value optimized out>, arg=<value
optimized out>) at syncrepl.c:959
#7  do_syncrepl (ctx=<value optimized out>, arg=<value optimized out>) at
#8  0x000000000041f7aa in connection_read_thread (ctx=0x59831d70, argv=<value
optimized out>) at connection.c:1251
#9  0x00000000004ec5ec in ldap_int_thread_pool_wrapper (xpool=0x84de50) at
#10 0x000000301b20673d in start_thread (arg=<value optimized out>) at
#11 0x000000301aad44bd in clone () from /lib64/libc.so.6

Let me know if I can provide more info.