(gdb) bt
#0  0x2837f537 in pthread_testcancel () from /lib/libpthread.so.2
#1  0x2836e89a in sigaction () from /lib/libpthread.so.2
#2  0x2836888d in pthread_kill () from /lib/libpthread.so.2
#3  0x28368256 in raise () from /lib/libpthread.so.2
#4  0x28442e34 in abort () from /lib/libc.so.6
#5  0x2841f060 in __assert () from /lib/libc.so.6
#6  0x080aad9e in entry_schema_check (op=0xcf0fb0c0, e=0xae44280, oldattrs=0x0, manage=0, text=0xcf0fb094, textbuf=0xcf0faf10 "╓'8(", textlen=256) at schema_check.c:87
#7  0x286908a3 in bdb_add (op=0xcf0fb0c0, rs=0xcf0fb080) at add.c:63
#8  0x080ec0b5 in accesslog_response (op=0x8c98200, rs=0xcf0fbd90) at accesslog.c:1175
#9  0x080db272 in over_back_response (op=0x8c98200, rs=0xcf0fbd90) at backover.c:236
#10 0x08080a75 in send_ldap_response (op=0x8c98200, rs=0xcf0fbd90) at result.c:303
#11 0x080818ac in slap_send_ldap_result (op=0x8c98200, rs=0xcf0fbd90) at result.c:574
#12 0x08113e35 in unique_modify (op=0x8c98200, rs=0xcf0fbd90) at unique.c:490
#13 0x080db309 in overlay_op_walk (op=0x8c98200, rs=0xcf0fbd90, which=op_modify, oi=0x8214f00, on=0x8216100) at backover.c:498
#14 0x080db543 in over_op_func (op=0x8c98200, rs=0xcf0fbd90, which=op_modify) at backover.c:560
#15 0x080db650 in over_op_modify (op=0x8c98200, rs=0xcf0fbd90) at backover.c:594
#16 0x0808b0c6 in fe_op_modify (op=0x8c98200, rs=0xcf0fbd90) at modify.c:395
#17 0x0808a33e in do_modify (op=0x8c98200, rs=0xcf0fbd90) at modify.c:200
#18 0x0806fb84 in connection_operation (ctx=0xcf0fbe20, arg_v=0x8c98200) at connection.c:1133
#19 0x281b36ad in ldap_int_thread_pool_wrapper () from /usr/local/lib/libldap_r-2.3.so.2
#20 0x283703a5 in pthread_create () from /lib/libpthread.so.2
#21 0x2842e3df in _ctx_start () from /lib/libc.so.6
(gdb) info threads
  7 Thread 0x818b000 (sleeping)  0x28377f9b in pthread_mutexattr_init () from /lib/libpthread.so.2
  6 Thread 0x8267200 (LWP 100039)  0x2837f4f7 in pthread_testcancel () from /lib/libpthread.so.2
  5 Thread 0x8267a00 (runnable)  0x2844658b in select () from /lib/libc.so.6
* 4 Thread 0x8267c00 (LWP 100065)  0x2837f537 in pthread_testcancel () from /lib/libpthread.so.2
  3 Thread 0x8267e00 (sleeping)  0x28377f9b in pthread_mutexattr_init () from /lib/libpthread.so.2
  2 Thread 0x8c98000 (sleeping)  0x28377f9b in pthread_mutexattr_init () from /lib/libpthread.so.2
  1 Thread 0xad16a00 (sleeping)  0x28377f9b in pthread_mutexattr_init () from /lib/libpthread.so.2