According to this thread
it could be a bug in module rts5139, whode description is:
Realtek RTS5139/29 USB card reader driver
Please check that this module be in use with 'lsmod|grep 5139' 'lspci -k|grep -B3 5139'
If yes, as root do:
to to unload the module.
If that works, blacklist it. as root:
echo "blacklist rts5139" > /etc/modprobe.d/blacklist_5139
If you need to use your card reader, type as root
to load the module.
Of course this is (possibly) a temporary fix. Real fix should come from upstream developer of the module.