Ran it with gdb, reproduced, and then interrupted when it started consuming 100% CPU:
Thread 1 "pcscd" received signal SIGINT, Interrupt. 0x00007ffff74e2853 in select () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007ffff74e2853 in select () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x0000000000411cfd in ProcessEventsServer (pdwClientID=pdwClientID@entry=0x7fffffffe49c) at winscard_msg_srv.c:223 #2 0x00000000004037f9 in SVCServiceRunLoop () at pcscdaemon.c:128 #3 main (argc=<optimized out>, argv=<optimized out>) at pcscdaemon.c:685 (gdb) info threads Id Target Id Frame * 1 Thread 0x7ffff7fb9740 (LWP 18298) "pcscd" 0x00007ffff74e2853 in select () from /lib/x86_64-linux-gnu/libc.so.6 2 Thread 0x7ffff6fb0700 (LWP 18302) "pcscd" 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 3 Thread 0x7ffff67af700 (LWP 18303) "pcscd" 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 4 Thread 0x7ffff5fae700 (LWP 18304) "pcscd" 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 5 Thread 0x7ffff57ad700 (LWP 18305) "pcscd" 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) thread 2 [Switching to thread 2 (Thread 0x7ffff6fb0700 (LWP 18302))] #0 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff6fc064c in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0 #2 0x00007ffff77b666a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #3 0x00007ffff74ec01d in clone () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) thread 3 [Switching to thread 3 (Thread 0x7ffff67af700 (LWP 18303))] #0 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff6fc064c in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0 #2 0x00007ffff77b666a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #3 0x00007ffff74ec01d in clone () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) thread 4 [Switching to thread 4 (Thread 0x7ffff5fae700 (LWP 18304))] #0 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff6fb9bc5 in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0 #2 0x00007ffff6fbab53 in libusb_handle_events_timeout_completed () from /lib/x86_64-linux-gnu/libusb-1.0.so.0 #3 0x00007ffff6fbac3f in libusb_handle_events () from /lib/x86_64-linux-gnu/libusb-1.0.so.0 #4 0x00007ffff71d64bc in ?? () from /usr/lib/pcsc/drivers/ifd-ccid.bundle/Contents/Linux/libccid.so #5 0x00007ffff71d0b83 in ?? () from /usr/lib/pcsc/drivers/ifd-ccid.bundle/Contents/Linux/libccid.so #6 0x00000000004064db in EHStatusHandlerThread (rContext=0x61f010) at eventhandler.c:464 #7 0x00007ffff77b666a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #8 0x00007ffff74ec01d in clone () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) thread 5 [Switching to thread 5 (Thread 0x7ffff57ad700 (LWP 18305))] #0 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007ffff74e09ed in poll () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x000000000040eeaa in poll (__timeout=-1, __nfds=1, __fds=0x7ffff57aced0) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46 #2 HPEstablishUSBNotifications (arg=0x649910) at hotplug_libudev.c:624 #3 0x00007ffff77b666a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #4 0x00007ffff74ec01d in clone () from /lib/x86_64-linux-gnu/libc.so.6 -- You received this bug notification because you are a member of Desktop 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 -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
