It starts consuming 100% CPU after this:

02341452 hotplug_libudev.c:642:HPEstablishUSBNotifications() USB Device removed
00000217 hotplug_libudev.c:619:HPEstablishUSBNotifications()
00000068 hotplug_libudev.c:642:HPEstablishUSBNotifications() USB Device removed
00000149 hotplug_libudev.c:619:HPEstablishUSBNotifications()
00002713 hotplug_libudev.c:642:HPEstablishUSBNotifications() USB Device removed
00000152 hotplug_libudev.c:619:HPEstablishUSBNotifications()
00020583 hotplug_libudev.c:642:HPEstablishUSBNotifications() USB Device removed
00000143 hotplug_libudev.c:619:HPEstablishUSBNotifications()
02634822 ifdhandler.c:1143:IFDHPowerICC() action: PowerDown, 
usb:1050/0115:libudev:1:/dev/bus/usb/003/002 (lun: 0)
00000091 eventhandler.c:479:EHStatusHandlerThread() powerState: 
POWER_STATE_UNPOWERED

or this:

05000574 ifdhandler.c:1143:IFDHPowerICC() action: PowerDown, 
usb:1050/0115:libudev:1:/dev/bus/usb/003/002 (lun: 0)
00000261 eventhandler.c:479:EHStatusHandlerThread() powerState: 
POWER_STATE_UNPOWERED
06904552 hotplug_libudev.c:648:HPEstablishUSBNotifications() USB Device add
00000242 hotplug_libudev.c:294:get_driver() Looking for a driver for VID: 
0x046D, PID: 0x0825, path: /dev/bus/usb/003/007
00000015 hotplug_libudev.c:414:HPAddDevice() /dev/bus/usb/003/007 is not a 
supported smart card reader
00000017 hotplug_libudev.c:619:HPEstablishUSBNotifications()
00022668 hotplug_libudev.c:648:HPEstablishUSBNotifications() USB Device add
00000214 hotplug_libudev.c:294:get_driver() Looking for a driver for VID: 
0x046D, PID: 0x0825, path: /dev/bus/usb/003/007
00000013 hotplug_libudev.c:414:HPAddDevice() /dev/bus/usb/003/007 is not a 
supported smart card reader
00000017 hotplug_libudev.c:619:HPEstablishUSBNotifications()
00006048 hotplug_libudev.c:648:HPEstablishUSBNotifications() USB Device add
00000207 hotplug_libudev.c:294:get_driver() Looking for a driver for VID: 
0x046D, PID: 0x0825, path: /dev/bus/usb/003/007
00000014 hotplug_libudev.c:414:HPAddDevice() /dev/bus/usb/003/007 is not a 
supported smart card reader
00000015 hotplug_libudev.c:619:HPEstablishUSBNotifications()
00014614 hotplug_libudev.c:648:HPEstablishUSBNotifications() USB Device add
00000200 hotplug_libudev.c:294:get_driver() Looking for a driver for VID: 
0x046D, PID: 0x0825, path: /dev/bus/usb/003/007
00000016 hotplug_libudev.c:414:HPAddDevice() /dev/bus/usb/003/007 is not a 
supported smart card reader
00000014 hotplug_libudev.c:619:HPEstablishUSBNotifications()

Basically, if I plug or unplug a USB device, pcscd immediately starting
using 100% CPU.

Let me know if there is anything else I can send you to help you debug.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to pcsc-lite in Ubuntu.
https://bugs.launchpad.net/bugs/1551897

Title:
  Excessive CPU utilization

Status in pcsc-lite package in Ubuntu:
  New

Bug description:
  In xenial, pcscd CPU utilization occasionally goes haywire:

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND   
                                                                                
                                                    
  27404 root      20   0  384264   4992   2228 S 100.3  0.0  75:39.03 
/usr/sbin/pcscd --foreground --auto-exit                                        
                                                              

  I get this about once a day since installing xenial. I can't quite
  connect it to any specific event on the system, it just seems to
  happen sporadically -- fan turns on, I run top, and there it is again.

  Never had this issue on same hardware incl. smartcard with trusty.

  I wonder if it might be this? https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=718473

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/pcsc-lite/+bug/1551897/+subscriptions

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