hotkeys fails to lock and goes into 100% eating CPU

[Ariel Faigon]

Binary package hint: hotkeys

$ apt-cache policy hotkeys
hotkeys:
  Installed: 0.5.7.4-0.1
  Candidate: 0.5.7.4-0.1
  Version table:
 *** 0.5.7.4-0.1 0
        500 http://us.archive.ubuntu.com intrepid/universe Packages
        100 /var/lib/dpkg/status

When hotkeys is started under strace, it goes on to eat 100% of my CPU.
I see the splash screen, then it starts spinning in a tight loop.

$ strace -F -o /dev/null hotkeys
  X Error of failed request: 0
  Major opcode of failed request: 0 ()
  Serial number of failed request: 0
  Current serial number in output stream: 11
: Program exiting...Locking assertion failure. Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb75207c7]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb752096e]
#2 /usr/lib/libX11.so.6 [0xb7ed3619]
#3 /usr/lib/libX11.so.6(XFreeGC+0x26) [0xb7eadff6]
#4 /usr/lib/libX11.so.6(XCloseDisplay+0x5f) [0xb7ea71ff]
#5 [0x804b117]
#6 [0x804b775]
#7 [(nil)]

So it seems like hotkeys claims it is exiting due to a failure to lock something. But it doesn't manage to exit.

Now 'top shows this as first entry:
  PID USER VIRT RES SHR WCHAN S %CPU %MEM TIME COMMAND
14448 ariel 15228 2216 1324 - R 100 0.1 2:41 hotkeys

The process is in a tight loop with no system calls (neither ltrace nor strace print anything after attaching to Process 14448)

Last open file according to lsof:
hotkeys 14448 ariel 3u unix 0xec498e00 33702 socket

Attaching to the process with gdb shows the stack trace:

$ gdb /usr/bin/hotkeys 14448
...
(no debugging symbols found)
0xb7dce3c1 in _XGetXCBBuffer () from /usr/lib/libX11.so.6
(gdb) bt
#0 0xb7dce3c1 in _XGetXCBBuffer () from /usr/lib/libX11.so.6
#1 0xb7dcef89 in ?? () from /usr/lib/libX11.so.6
#2 0xb7dcf39a in _XReply () from /usr/lib/libX11.so.6
#3 0xb7dc2667 in XSync () from /usr/lib/libX11.so.6
#4 0xb7da222e in XCloseDisplay () from /usr/lib/libX11.so.6
#5 0x0804b117 in ?? ()
#6 0x0804b775 in ?? ()
#7 0x00000000 in ?? ()

I should add that I really don't need hotkeys anymore since Intrepid Ibex seems to recognize my fancy keyboard (Logitech iTouch family) just fine. I just wanted to report this for the sake of documenting all the problem I've seen since upgrading to Ibex.

[Randall Le-Fevre (randall-lefevre)]

I did a little playing around with this. It seems to not fail or consume 100% CPU when run as root, but it doesn't recognize keypresses either. This is with a config known to work in Feisty, Gutsy and Hardy.

I noticed when I ran xev that the keycodes for the media keys on my Compaq V6000 (V6215) had changed since installing Intrepid. I changed the keycodes in my keyboard config file, but it still didn't work.

[goued120 (goued120)]

I run hotkeys at login on a laptop with Xubuntu intrepid Ibex (upgraded from dapper) on a Dell Latitude D820.

I use 2 screens at work, and only one at home (see xorg.conf attached). I noticed that when using 2 screens, hotkeys uses 100% CPU, while it runs well when using one screen only.

When starting hotkeys manually with 2 screens, it gives the same error message as above.

Hope this would helps to find the issue.

[goued120 (goued120)]

I made the test again, and I was wrong: hotkeys doesn't run even with only one screen.
Sorry for the wrong track...