Comment # 13 on bug 110822 from b6khqjqov4@ugsbm.anonbox.net

Your bug sounds like mine which came after I bought and added a used RX580 to
my system. Since then had random full system freezes (I think only when I was
using Firefox or the internal Steam Chromium browser) and desktop hangs where
Cinnamon would crash and nothing except the mouse pointer would be movable. No
error in logs at first, but then I found this after the system hanged instead
of a hard freeze:

$ journalctl -p3:

<pre>
...
Jun 09 06:45:34 test systemd-coredump[1383]: Process 1328 (Web Content) of user
1000 dumped core.

                                             Stack trace of thread 1332:
                                             #0  0x00007f04ecd3ed36 n/a
(/home/test/tor-browser_en-US/Browser/libxul.so)
                                             #1  0x0000000000000000 n/a (n/a)
Jun 09 06:45:35 test systemd-coredump[1374]: Process 1106 (firefox.real) of
user 1000 dumped core.

                                             Stack trace of thread 1124:
                                             #0  0x00007fd89155036f raise
(libpthread.so.0)
                                             #1  0x00007fd88b6b3a5f n/a
(/home/test/tor-browser_en-US/Browser/libxul.so)
Jun 09 06:45:35 test systemd-coredump[1384]: Process 1162 (Web Content) of user
1000 dumped core.

                                             Stack trace of thread 1164:
                                             #0  0x00007ffb32c6ad36 n/a
(/home/test/tor-browser_en-US/Browser/libxul.so)
                                             #1  0x0000000000000000 n/a (n/a)
Jun 09 06:45:38 test systemd-coredump[1385]: Process 1237 (Web Content) of user
1000 dumped core.

                                             Stack trace of thread 1241:
                                             #0  0x00007f9aa7f3ed36 n/a
(/home/test/tor-browser_en-US/Browser/libxul.so)
                                             #1  0x0000000000000000 n/a (n/a)
Jun 09 06:47:31 test systemd-coredump[1640]: Process 1536 (Web Content) of user
1000 dumped core.

                                             Stack trace of thread 1536:
                                             #0  0x00007f830d3ee3e7 n/a
(/home/test/tor-browser_en-US/Browser/libxul.so)
Jun 09 06:47:32 test systemd-coredump[1650]: Process 1603 (Web Content) of user
1000 dumped core.

                                             Stack trace of thread 1606:
                                             #0  0x00007f8f129ebd36 n/a
(/home/test/tor-browser_en-US/Browser/libxul.so)
                                             #1  0x0000000000000000 n/a (n/a)
Jun 09 06:47:32 test systemd-coredump[1639]: Process 1410 (firefox.real) of
user 1000 dumped core.

                                             Stack trace of thread 1410:
                                             #0  0x00007fe94ed5f36f raise
(libpthread.so.0)
                                             #1  0x00007fe948ec2a5f n/a
(/home/test/tor-browser_en-US/Browser/libxul.so)
Jun 09 06:47:32 test systemd-coredump[1649]: Process 1467 (Web Content) of user
1000 dumped core.

                                             Stack trace of thread 1469:
                                             #0  0x00007fb2790c2d36 n/a
(/home/test/tor-browser_en-US/Browser/libxul.so)
                                             #1  0x0000000000000000 n/a (n/a)
...
</pre>

My system:
- MSI B450 Tomahawk
- Athlon 200GE (yes, this CPU will be upgraded to a Ryzen 3000 one of course
;))
- RX 580 4G Nitro+
- G.Skill Aegis DIMM Kit 16GB, DDR4-3000, CL16-18-18-38 (F4-3000C16D-16GISB)

My fix: 2 things I can remember I did which are maybe the fix:
1.) I disabled integrated graphics in the BIOS.
2.) I installed amd-ucode.

No hangs/freezes or anything since my fix. I'll report back here should I
encounter a crash/freeze/hang again.