Public bug reported:
After latest focal updates, gnome-shell crashes and I lose my entire
session when I lock the screen.
c@slate:~$ dpkg -l | grep gnome-shell
ii gnome-shell3.35.91-1ubuntu2
amd64graphical shell for the
I can work around this with my custom build of pcscd with udev disabled,
but it seems that this issue will still affect Debian and Ubuntu users
who install the package.
Can we mark this bug as Confirmed, since my symptoms are so similar to
the descriptions in the Debian bug[1] you've linked
Recompiling with --disable-libudev gets rid of the 100% CPU problem and
I can still use my smartcard.
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https://bugs.launchpad.net/bugs/1551897
Title:
Excessive CPU
** Attachment added: "pcscd binary and core dump"
https://bugs.launchpad.net/ubuntu/+source/pcsc-lite/+bug/1551897/+attachment/4588521/+files/pcscd-core-bin.tar.bz2
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Here's a core dump with the corresponding pcscd binary I built from
source, which was taken in the above-mentioned gdb session.
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https://bugs.launchpad.net/bugs/1551897
Ran it with gdb, reproduced, and then interrupted when it started
consuming 100% CPU:
Thread 1 "pcscd" received signal SIGINT, Interrupt.
0x774e2853 in select () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x774e2853 in select () from /lib/x86_64-linux-gnu/libc.so.6
#1
Oh, here's /var/log/syslog from unplugging and replugging in my camera.
I Ctrl-C killed pcscd after it went to 100% each time.
pcscd segfaulted.
Mar 4 12:04:11 mawhrin-skel pcscd: debuglog.c:289:DebugLogSetLevel() debug
level=debug
Mar 4 12:04:13 mawhrin-skel kernel: [14604.513268] usb 3-1:
It starts consuming 100% CPU after this:
02341452 hotplug_libudev.c:642:HPEstablishUSBNotifications() USB Device removed
0217 hotplug_libudev.c:619:HPEstablishUSBNotifications()
0068 hotplug_libudev.c:642:HPEstablishUSBNotifications() USB Device removed
0149
I ran pcscd as you suggested, capturing output. Made sure the smart card
was working by using my SSH key. I was then able to reproduce the 100%
cpu condition by plugging in my Logitech USB webcam.
Attached the output, but I redacted the hex dumps before posting here
because I'm not sure if they
This is what I've got installed ^^
c@mawhrin-skel:~/omnibus-layers$ dpkg -l | grep pcscd
ii pcscd 1.8.14-1ubuntu1
amd64Middleware to access a smart card using PC/SC
(daemon side)
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Public bug reported:
In xenial, pcscd CPU utilization occasionally goes haywire:
PID USER PR NIVIRTRESSHR S %CPU %MEM TIME+ COMMAND
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