I can confirm this problem. I could fix it by replacing my /lib/x86_64-linux-gnu/libusb-1.0.so.0.1.0 with the version libusb-1.0-0_1.0.9~rc3-2ubuntu1 (probably a newer version would also work, I just could not find one).
The version which did NOT work: apt-cache policy libusb-1.0-0 libusb-1.0-0: Installed: 2:1.0.17-1ubuntu2 Candidate: 2:1.0.17-1ubuntu2 Version table: *** 2:1.0.17-1ubuntu2 0 500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages 100 /var/lib/dpkg/status OS: Ubuntu 14.04 64bit 3.13.0-43-generic #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux pcscd --version pcsc-lite version 1.8.10. Copyright (C) 1999-2002 by David Corcoran <corco...@linuxnet.com>. Copyright (C) 2001-2011 by Ludovic Rousseau <ludovic.rouss...@free.fr>. Copyright (C) 2003-2004 by Damien Sauveron <sauve...@labri.fr>. Report bugs to <mus...@lists.musclecard.com>. Enabled features: Linux x86_64-pc-linux-gnu serial usb libudev usbdropdir=/usr/lib/pcsc/drivers ipcdir=/var/run/pcscd configdir=/etc/reader.conf.d Smartcard reader: HID Omnikey 3121 (https://www.hidglobal.com/products/readers/omnikey/3121) Driver: https://www.hidglobal.com/drivers/21278 which is ifdokccid_linux_x86_64-v4.0.5.5.bundle. lsusb Bus 002 Device 052: ID 076b:3022 OmniKey AG ### Segfaults in syslog: Dec 20 20:46:17 liberty kernel: [ 8543.889726] usb 2-1.3: new full-speed USB device number 6 using ehci-pci Dec 20 20:46:17 liberty kernel: [ 8543.988226] usb 2-1.3: New USB device found, idVendor=076b, idProduct=3022 Dec 20 20:46:17 liberty kernel: [ 8543.988238] usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 Dec 20 20:46:17 liberty kernel: [ 8543.988244] usb 2-1.3: Product: Smart Card Reader USB Dec 20 20:46:17 liberty kernel: [ 8543.988249] usb 2-1.3: Manufacturer: OMNIKEY AG Dec 20 20:46:17 liberty mtp-probe: checking bus 2, device 6: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3" Dec 20 20:46:17 liberty mtp-probe: bus: 2, device: 6 was not an MTP device Dec 20 20:46:17 liberty kernel: [ 8543.999039] pcscd[29697]: segfault at 7f94f533d248 ip 00007f94f533d248 sp 00007f94f816aee0 error 14 in libgcc_s.so.1[7f94f5751000+16000] Dec 20 21:39:48 liberty kernel: [11755.020679] pcscd[30310]: segfault at 7febd0909248 ip 00007febd0909248 sp 00007febd3736ee0 error 14 Dec 21 13:23:00 liberty kernel: [13600.803213] pcscd[30707]: segfault at 7fdf6a8eb248 ip 00007fdf6a8eb248 sp 00007fdf6a8dbee0 error 14 in libdbus-1.so.3.7.6[7fdf6af38000+44000] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1296288 Title: pcscd crashes when disconnecting / reconnecting USB device To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pcsc-cyberjack/+bug/1296288/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs