Just for information:
I got another core dump with the libusbx compiled on monday. 
Are you interested in this one?

Program terminated with signal 11, Segmentation fault.
#0  0x00115e89 in add_to_flying_list (transfer=0xb5600468) at io.c:1175
1175    io.c: Datei oder Verzeichnis nicht gefunden.
        in io.c

(gdb) backtrace
#0  0x00115e89 in add_to_flying_list (transfer=0xb5600468) at io.c:1175
#1  0x00116358 in arm_timerfd_for_next_timeout (ctx=0xb560049c) at io.c:1338
#2  0x001181e8 in libusb_control_transfer (dev_handle=0x965b140, 
bmRequestType=232 '\350', bRequest=184 '\270', wValue=33011, wIndex=18, 
data=0x3e8 <Address 0x3e8 out of bounds>, wLength=52120, timeout=1232166) at 
sync.c:148
#3  0x0011836f in do_sync_bulk_transfer (dev_handle=0x965b140, endpoint=38 '&', 
buffer=0x965cb98 "k\b", length=18, transferred=0xb6f1e13c, timeout=1000, type=2 
'\002') at sync.c:190
#4  0x001388a7 in CCIDDevSend (Lun=0, TxBuffer=0x965cb98 "k\b", TxLength=18, 
ulEscapeSpecificTimeout=1000) at ./bus/usb/usb.c:1055
#5  0x0012cfba in CCIDDevSendWrap (Lun=1387572, request=0x965cb98 "k\b", 
slot=18) at ccid/common.c:901
#6  0x0012e2a8 in PC_to_RDR_Escape (Lun=0, slot=0x965bbd0, pTxBuffer=0xb6f1e23c 
"G\003\a?\006?+", dwTxLength=8, pRxBuffer=0xb6f1e1fc 
"\033\340\034\355\a?\006?+", pdwRxLength=0xb6f1e27c, fIsLocked=0 '\000') at 
ccid/common.c:3026
#7  0x0014368f in WriteMultipleRegisters (slot=0x965bbd0, ucEnterAction=3 
'\003', pbWriteBuffer=0xb6f1e2b6 "\a?\006?+", ulBytesToWrite=6) at 
./okccid/rfid/rfid_fw5x.c:85
#8  0x0014379c in RC632ResetTimerUnit (psRFIDReader=0x965bca0) at 
./okccid/rfid/rfid_fw5x.c:1436
#9  0x0013f56e in RFIDCardDetectAndTrack (pSlot=0x965bbd0) at 
./okccid/rfid/rfid.c:2347
#10 0x00140d30 in RFIDUpdateCurrentStateThread (pSlot=0x965bbd0) at 
./okccid/rfid/rfid.c:593
#11 0x00451d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0x00c8f46e in clone () from /lib/i386-linux-gnu/libc.so.6

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