I am using device 1a44:0001 VASCO Data Security International Digipass 905 
SmartCard Reader
I am on Ubuntu 14.04.

Unplugging or plugging in this device causes pscsd to crash. Syslog output:
Jul 26 18:36:10 Studio-Hybrid-140g kernel: [ 1869.326342] pcscd[5518]: segfault 
at 7fd75e71f248 ip 00007fd75e71f248 sp 00007fd75e70fee0 error 14 in 
libgcc_s.so.1[7fd75e92d000+16000]

Not able to resolve the crash, and get my card reader reliably working.
BUT I have a workaround, for who's fighting with this.

Kill pcscd. Plug the smart card reader in, and within one second (!) restart 
pcscd:
sudo service pcscd restart

The smartcard reader gets detected, and pcscd keeps on running. For what
it's worth... Hope this helps.

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https://bugs.launchpad.net/bugs/1296288

Title:
  pcscd crashes when disconnecting / reconnecting USB device

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