Comment 25 for bug 1860512

Can't suspend in desktop 20.04, "dmesg -T|grep Freez -A4" output:

[dj. de set. 24 12:56:01 2020] Freezing user space processes ...
[dj. de set. 24 12:56:21 2020] Freezing of tasks failed after 20.010 seconds (2 tasks refusing to freeze, wq_busy=0):
[dj. de set. 24 12:56:21 2020] single D 0 2013 1909 0x00004324
[dj. de set. 24 12:56:21 2020] Call Trace:
[dj. de set. 24 12:56:21 2020] __schedule+0x2e3/0x740
[dj. de set. 24 12:56:21 2020] schedule+0x42/0xb0
--
[dj. de set. 24 12:56:21 2020] Freezing user space processes ...
[dj. de set. 24 12:56:41 2020] Freezing of tasks failed after 20.006 seconds (2 tasks refusing to freeze, wq_busy=0):
[dj. de set. 24 12:56:41 2020] single D 0 2013 1909 0x00004324
[dj. de set. 24 12:56:41 2020] Call Trace:
[dj. de set. 24 12:56:41 2020] __schedule+0x2e3/0x740
[dj. de set. 24 12:56:41 2020] schedule+0x42/0xb0
--
[dj. de set. 24 13:31:10 2020] Freezing user space processes ...
[dj. de set. 24 13:31:30 2020] Freezing of tasks failed after 20.006 seconds (2 tasks refusing to freeze, wq_busy=0):
[dj. de set. 24 13:31:30 2020] single D 0 2007 1909 0x00004324
[dj. de set. 24 13:31:30 2020] Call Trace:
[dj. de set. 24 13:31:30 2020] __schedule+0x2e3/0x740
[dj. de set. 24 13:31:30 2020] schedule+0x42/0xb0
--
[dj. de set. 24 13:31:30 2020] Freezing user space processes ...
[dj. de set. 24 13:31:50 2020] Freezing of tasks failed after 20.007 seconds (2 tasks refusing to freeze, wq_busy=0):
[dj. de set. 24 13:31:50 2020] single D 0 2007 1909 0x00004324
[dj. de set. 24 13:31:50 2020] Call Trace:
[dj. de set. 24 13:31:50 2020] __schedule+0x2e3/0x740
[dj. de set. 24 13:31:50 2020] schedule+0x42/0xb0