Bspwm Hung on select() and Become Unresponsive
walwan opened this issue · comments
description
I am (randomly) experiencing an issue similar to #1398 #1318 #683 where
- the mouse moves, but no click on other application windows takes effect, except when clicking on polybar (I use the bspwm plugin on polybar and I can switch desktop by clicking the numbers on polaybar. I can interact with other polaybar plugins as well.);
- no window would respond to keyboard inputs. But I can switch tty with ctrl+alt+FnX.
The difference between my case and previous issues are
- there is no bspc command that gets stuck;
- I am not using
player-mpris-tailscripts in polybar; - the running state of bspwm is not
Tas in #1146; - I am not aware of any use of
bspc subscribe --fifo.
troubleshooting steps tried
I previously suspect the freezing is caused by a particular key press/combination, so I used screenkey to log all my key presses. It turns out to be rather irrelevant to what I pressed before wm freezes. Another interesting thing is that after the wm freezes, if I press any key combination with super or ctrl (like super + h), the screenkey will only show the second key pressed (like 'h' in the case of super + h).
I tried to switch to tty and restart the wm with bspc, but the problem existed after a restart. Killing polybar did not help either.
I am currently using a bspwm with debug symbols, and the backtrace shows the execution is in select() as shown below
(gdb) attach 1844
Attaching to process 1844
Reading symbols from /usr/bin/bspwm...
Reading symbols from /usr/lib/libxcb.so.1...
(No debugging symbols found in /usr/lib/libxcb.so.1)
Reading symbols from /usr/lib/libxcb-util.so.1...
(No debugging symbols found in /usr/lib/libxcb-util.so.1)
Reading symbols from /usr/lib/libxcb-keysyms.so.1...
(No debugging symbols found in /usr/lib/libxcb-keysyms.so.1)
Reading symbols from /usr/lib/libxcb-icccm.so.4...
(No debugging symbols found in /usr/lib/libxcb-icccm.so.4)
Reading symbols from /usr/lib/libxcb-ewmh.so.2...
(No debugging symbols found in /usr/lib/libxcb-ewmh.so.2)
Reading symbols from /usr/lib/libxcb-randr.so.0...
(No debugging symbols found in /usr/lib/libxcb-randr.so.0)
Reading symbols from /usr/lib/libxcb-xinerama.so.0...
(No debugging symbols found in /usr/lib/libxcb-xinerama.so.0)
Reading symbols from /usr/lib/libxcb-shape.so.0...
(No debugging symbols found in /usr/lib/libxcb-shape.so.0)
Reading symbols from /usr/lib/libc.so.6...
(No debugging symbols found in /usr/lib/libc.so.6)
Reading symbols from /usr/lib/libXau.so.6...
(No debugging symbols found in /usr/lib/libXau.so.6)
Reading symbols from /usr/lib/libXdmcp.so.6...
(No debugging symbols found in /usr/lib/libXdmcp.so.6)
Reading symbols from /lib64/ld-linux-x86-64.so.2...
(No debugging symbols found in /lib64/ld-linux-x86-64.so.2)
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
(gdb) bt
0x00007fa9b28c5804 in select () from /usr/lib/libc.so.6
(gdb) bt 1
#0 0x00007fa9b28c5804 in select () from /usr/lib/libc.so.6
#1 0x0000558ab2b938de in main (argc=1, argv=0x7ffe891165f8) at src/bspwm.c:221
(gdb) frame 1
#1 0x0000558ab2b938de in main (argc=1, argv=0x7ffe891165f8) at src/bspwm.c:221
warning: Source file is more recent than executable.
221 if (select(max_fd + 1, &descriptors, NULL, NULL, NULL) > 0) {
(gdb) p max_fd
$1 = 4
(gdb) p descriptors
$2 = {__fds_bits = {24, 0 <repeats 15 times>}}
(gdb) q
Detaching from program: /usr/bin/bspwm, process 1844
[Inferior 1 (process 1844) detached]
The output of lsof -p$(pgrep -x bspwm) seems the same as an normal wm:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
bspwm 1950 USERNAME cwd DIR 0,56 1344 267 /home/USERNAME
bspwm 1950 USERNAME rtd DIR 0,33 148 256 /
bspwm 1950 USERNAME txt REG 0,33 551824 3710284 /usr/bin/bspwm
bspwm 1950 USERNAME mem REG 0,31 3710284 /usr/bin/bspwm (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 3415779 /usr/lib/libXdmcp.so.6.0.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 3415790 /usr/lib/libXau.so.6.0.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 2841763 /usr/lib/libc.so.6 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 3415876 /usr/lib/libxcb-shape.so.0.0.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 3415891 /usr/lib/libxcb-xinerama.so.0.0.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 3415861 /usr/lib/libxcb-randr.so.0.1.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 2849224 /usr/lib/libxcb-ewmh.so.2.0.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 2849227 /usr/lib/libxcb-icccm.so.4.0.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 2849181 /usr/lib/libxcb-keysyms.so.1.0.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 1343524 /usr/lib/libxcb-util.so.1.0.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 3415909 /usr/lib/libxcb.so.1.1.0 (path dev=0,33)
bspwm 1950 USERNAME mem REG 0,31 2841754 /usr/lib/ld-linux-x86-64.so.2 (path dev=0,33)
bspwm 1950 USERNAME 0r FIFO 0,13 0t0 36992 pipe
bspwm 1950 USERNAME 1w CHR 1,3 0t0 4 /dev/null
bspwm 1950 USERNAME 2w REG 0,56 80367 5042552 /home/USERNAME/.local/share/sddm/xorg-session.log
bspwm 1950 USERNAME 3u unix 0x00000000df3d0dde 0t0 31624 type=STREAM (CONNECTED)
bspwm 1950 USERNAME 4u unix 0x0000000053b11a60 0t0 31625 /tmp/bspwm_0_0-socket type=STREAM (LISTEN)
bspwm 1950 USERNAME 5u unix 0x000000002314e97a 0t0 31664 /tmp/bspwm_0_0-socket type=STREAM (CONNECTED)
environment
- Archlinux x86_64 6.0.11-zen1-1-zen
- bspwm: latest git commit (527864d)
Thanks in advance!
Oh I just found this should be a normal behavior. Closing the issue.
What do you mean by "normal behavior"?
I'm facing a similar issue of bspwm abruptly freezing, but in my case it only occurs after a long uptime (around 30-40 hours) and I'm dying to figure out a fix for this.