Xorg core dump Device or resource busy

[Mykola Sokolov]

Hi All,

I'm running Ubuntu 20.04 and periodically Xorg failing with core dump right
after boot. I'm using a multiseat setup with 2 wireless keyboards and 2
wireless mouses connected. It looks like frequent mouse polling caused Xorg
to slow down. But I have updated the polling interval like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbhid.mousepoll=4"
update-grub

But still, Xorg is failing with core dump and sometimes freezing.
This is from Xorg.0.log

[    22.229] (II) Unloading vesa
[    22.229] (EE) modeset(0): drmSetMaster failed: *Device or resource busy*
[    22.229] (EE)
Fatal server error:
[    22.229] (EE) AddScreen/ScreenInit failed for driver 0
[    22.229] (EE)
[    22.229] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[    22.229] (EE) Please also check the log file at "/var/log/Xorg.0.log"
for additional information.
[    22.229] (EE)
[    22.229] (EE) Server terminated with error (1). Closing log file.

This is from gdb:
Reading symbols from /usr/lib/xorg/Xorg...
(No debugging symbols found in /usr/lib/xorg/Xorg)
[New LWP 1294]
[New LWP 1301]
[New LWP 1304]
[New LWP 1303]
[New LWP 1302]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/lib/xorg/Xorg -core :0 -seat seat1 -auth
/var/run/lightdm/root/:0 -noliste'.
Program terminated with signal SIGABRT, Aborted.
#0  __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7f2053c9ba40 (LWP 1294))]
(gdb) bt
#0  __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007f2053f09859 in __GI_abort () at abort.c:79
#2  0x000055ac00e8e1b0 in OsAbort ()
#3  0x000055ac00e935e9 in ?? ()
#4  0x000055ac00e9444a in FatalError ()
#5  0x000055ac00d6c018 in InitOutput ()
#6  0x000055ac00d2dda4 in ?? ()
#7  0x00007f2053f0b0b3 in __libc_start_main (main=0x55ac00d179f0, argc=9,
argv=0x7fff526d3138, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fff526d3128)
    at ../csu/libc-start.c:308
#8  0x000055ac00d17a2e in _start ()

WIth regards
Mykola Sokolov
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