I am experiencing the same bug. My computer is a Dell Latitude E6220. I can reliably reproduce the bug with the following steps:
1. Switch off wireless (using the hardware button) 2. Suspend 3. Resume 4. Switch on wireless Le 02/08/2013 10:56, Ludovic Rousseau a écrit : > Can you: > 1. run pcscd inside gdb > 2. stop pcscd using Ctrl-C while in the 100% CPU loop > 3. use the "bt" gdb command to generate a backtrace > 4. send the result There: > (gdb) bt > #0 0x00007ffff72d6793 in select () from /lib/x86_64-linux-gnu/libc.so.6 > #1 0x0000000000410b70 in ?? () > #2 0x00000000004035b0 in ?? () > #3 0x00007ffff7216995 in __libc_start_main () from > /lib/x86_64-linux-gnu/libc.so.6 > #4 0x00000000004038de in _start () I've noticed that only one thread (and not the main one) was consuming 100% CPU: > (gdb) thread apply all bt > > Thread 5 (Thread 0x7ffff55c1700 (LWP 8126)): > #0 0x00007ffff72d6793 in select () from /lib/x86_64-linux-gnu/libc.so.6 > #1 0x000000000040e2ab in ?? () > #2 0x00007ffff75a8e0e in start_thread () from > /lib/x86_64-linux-gnu/libpthread.so.0 > #3 0x00007ffff72dd93d in clone () from /lib/x86_64-linux-gnu/libc.so.6 > > Thread 4 (Thread 0x7ffff5dc2700 (LWP 8125)): > #0 0x00007ffff72d219d in poll () from /lib/x86_64-linux-gnu/libc.so.6 > #1 0x00007ffff6dcd73e in poll (__timeout=60000, __nfds=4, > __fds=0x7ffff00009c0) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46 > #2 handle_events (ctx=ctx@entry=0x6586c0, tv=tv@entry=0x7ffff5dc1d80) at > ../../libusb/io.c:1963 > #3 0x00007ffff6dce3a3 in libusb_handle_events_timeout_completed > (ctx=0x6586c0, tv=tv@entry=0x7ffff5dc1dc0, completed=completed@entry=0x0) at > ../../libusb/io.c:2126 > #4 0x00007ffff6dce46f in libusb_handle_events (ctx=<optimized out>) at > ../../libusb/io.c:2202 > #5 0x00007ffff6fe8118 in ?? () from > /usr/lib/pcsc/drivers/ifd-ccid.bundle/Contents/Linux/libccid.so > #6 0x00007ffff6fe2fc2 in ?? () from > /usr/lib/pcsc/drivers/ifd-ccid.bundle/Contents/Linux/libccid.so > #7 0x0000000000405eed in ?? () > #8 0x00007ffff75a8e0e in start_thread () from > /lib/x86_64-linux-gnu/libpthread.so.0 > #9 0x00007ffff72dd93d in clone () from /lib/x86_64-linux-gnu/libc.so.6 > > Thread 3 (Thread 0x7ffff65c3700 (LWP 8124)): > #0 0x00007ffff72d219d in poll () from /lib/x86_64-linux-gnu/libc.so.6 > #1 0x00007ffff6dd36f8 in poll (__timeout=-1, __nfds=2, __fds=0x7ffff65c2ec0) > at /usr/include/x86_64-linux-gnu/bits/poll2.h:46 > #2 linux_udev_event_thread_main (arg=<optimized out>) at > ../../libusb/os/linux_udev.c:175 > #3 0x00007ffff75a8e0e in start_thread () from > /lib/x86_64-linux-gnu/libpthread.so.0 > #4 0x00007ffff72dd93d in clone () from /lib/x86_64-linux-gnu/libc.so.6 > > Thread 2 (Thread 0x7ffff6dc4700 (LWP 8123)): > #0 0x00007ffff72d219d in poll () from /lib/x86_64-linux-gnu/libc.so.6 > #1 0x00007ffff6dd36f8 in poll (__timeout=-1, __nfds=2, __fds=0x7ffff6dc3ec0) > at /usr/include/x86_64-linux-gnu/bits/poll2.h:46 > #2 linux_udev_event_thread_main (arg=<optimized out>) at > ../../libusb/os/linux_udev.c:175 > #3 0x00007ffff75a8e0e in start_thread () from > /lib/x86_64-linux-gnu/libpthread.so.0 > #4 0x00007ffff72dd93d in clone () from /lib/x86_64-linux-gnu/libc.so.6 > > Thread 1 (Thread 0x7ffff7fdb700 (LWP 8119)): > #0 0x00007ffff72d6793 in select () from /lib/x86_64-linux-gnu/libc.so.6 > #1 0x0000000000410b70 in ?? () > #2 0x00000000004035b0 in ?? () > #3 0x00007ffff7216995 in __libc_start_main () from > /lib/x86_64-linux-gnu/libc.so.6 > #4 0x00000000004038de in _start () The loop seems to happen in thread 2. With strace, I see an active poll-recvmsg loop. > 5. kill any running pcscd > 6. run in a terminal "sudo pcscd -dfa" > 7. send me the result After resume, I get: > 31404819 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x413C, PID: 0x8187, path: /dev/bus/usb/001/007 > 00002486 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x413C, PID: 0x8187, path: /dev/bus/usb/001/007 > 00003401 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x413C, PID: 0x8187, path: /dev/bus/usb/001/007 > 00000944 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x413C, PID: 0x8187, path: /dev/bus/usb/001/007 Then after a while, I get: > 29258929 hotplug_libudev.c:587:HPEstablishUSBNotifications() Device removed > 00000412 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x1D6B, PID: 0x0002, path: /dev/bus/usb/001/001 > 00000114 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x1D6B, PID: 0x0002, path: /dev/bus/usb/001/001 > 00000116 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x8087, PID: 0x0024, path: /dev/bus/usb/001/002 > 00000143 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x1D6B, PID: 0x0002, path: /dev/bus/usb/002/001 > 00000103 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x1D6B, PID: 0x0002, path: /dev/bus/usb/002/001 > 00000116 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x8087, PID: 0x0024, path: /dev/bus/usb/002/002 > 00000119 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x0A5C, PID: 0x5800, path: /dev/bus/usb/002/003 > 00000131 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x0A5C, PID: 0x5800, path: /dev/bus/usb/002/003 > 00000130 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x8087, PID: 0x0024, path: /dev/bus/usb/002/002 > 00000034 hotplug_libudev.c:587:HPEstablishUSBNotifications() Device removed > 00000252 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x1D6B, PID: 0x0002, path: /dev/bus/usb/001/001 > 00000064 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x1D6B, PID: 0x0002, path: /dev/bus/usb/001/001 > 00000064 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x8087, PID: 0x0024, path: /dev/bus/usb/001/002 > 00000080 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x1D6B, PID: 0x0002, path: /dev/bus/usb/002/001 > 00000061 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x1D6B, PID: 0x0002, path: /dev/bus/usb/002/001 > 00000063 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x8087, PID: 0x0024, path: /dev/bus/usb/002/002 > 00000065 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x0A5C, PID: 0x5800, path: /dev/bus/usb/002/003 > 00000074 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x0A5C, PID: 0x5800, path: /dev/bus/usb/002/003 > 00000072 hotplug_libudev.c:260:get_driver() Looking for a driver for VID: > 0x8087, PID: 0x0024, path: /dev/bus/usb/002/002 and so on... Cheers, -- Stéphane -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
