This is actually a bug in ccid's handling of composite USB devices, and has been fixed upstream (https://alioth.debian.org/plugins/scmgit/cgi- bin/gitweb.cgi?p=pcsclite/CCID.git;a=commitdiff_plain;h=3c21f452543983f3625a1965ce234074cbda6865).
My experience was that this bug caused pcscd to segfault, rather than to consume 100% CPU, but the fix appears to be the same either way. I've attached a debdiff that fixes the issue for me, and I've uploaded a test build to my PPA (https://launchpad.net/~broder/+archive/ubuntu /ubuntu-tests). I suspect this merits an SRU, since it's a significant regression in functionality without a good workaround; I'll start on the paperwork. ** Patch added: "ccid_1.4.22-1ubuntu0.1.debdiff" https://bugs.launchpad.net/ubuntu/+source/ccid/+bug/1551897/+attachment/4659458/+files/ccid_1.4.22-1ubuntu0.1.debdiff -- 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 ccid package in Ubuntu: Fix Released Status in pcsc-lite package in Ubuntu: Invalid Status in ccid source package in Xenial: Confirmed Status in pcsc-lite source package in Xenial: Invalid Status in pcsc-lite package in Debian: Fix Released 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/ccid/+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
