Cinnamon always crashes in following scenario:

1. Make sure you have more than one keyboard layout, for example English and Russian
2. Run the Virtual keyboard application that opens a virtual keyboard in the top side of the screen
3. Change your real keyboard layout into Russian one
4. Try to click on any button of the Virtual keyboard on your screen and then on some other button.

After the second click Cinnamon crashes.

I didn't try such a scenario with the previous 4.8.3 update. Usually I don't use any virtual keyboard. I've got into this scenario by curiosity, after reading commits between 4.8.3 and 4.8.4. Maybe the following upstream commit relates to this bug: https://github.com/linuxmint/cinnamon/commit/41e609565643759d2abf6b769d3580877d898580

Tested on another VM with Cinnamon 4.8.3 and it crashes after the above scenario as well.

Also the following SELinux alert appears after the crash:

SELinux is preventing gdb from read access on the chr_file card0.

* Plugin catchall (100. confidence) suggests ******

If you believe that gdb should be allowed read access on the card0 chr_file by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing:

ausearch -c 'gdb' --raw | audit2allow -M my-gdb

semodule -X 300 -i my-gdb.pp

Additional Information: Source Context system_u:system_r:abrt_t:s0-s0:c0.c1023 Target Context system_u:object_r:dri_device_t:s0 Target Objects card0 [ chr_file ] Source gdb Source Path gdb Port <Unknown> Host localhost.localdomain Source RPM Packages
Target RPM Packages
SELinux Policy RPM selinux-policy-targeted-3.14.6-33.fc33.noarch Local Policy RPM selinux-policy-targeted-3.14.6-33.fc33.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name localhost.localdomain Platform Linux localhost.localdomain 5.9.16-200.fc33.x86_64 #1 SMP Mon Dec 21 14:08:22 UTC 2020 x86_64 x86_64 Alert Count 1 First Seen 2020-12-30 22:39:55 IST Last Seen 2020-12-30 22:39:55 IST Local ID 0a902367-c169-487e-a338-f6ace1a63b6b

Raw Audit Messages type=AVC msg=audit(1609360795.782:528): avc: denied { read } for pid=1886 comm="gdb" name="card0" dev="devtmpfs" ino=355 scontext=system_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:dri_device_t:s0 tclass=chr_file permissive=0

Hash: gdb,abrt_t,dri_device_t,chr_file,read

No regressions spotted.

no regressions noted

I've checked the above crash of Cinnamon with the Virtual Keyboard on Linux Mint 20.1 (currently beta). That crash was reproducible there as well (even with Cinnamon 4.8.5) until I updated the system today. Don't know exactly how they fixed it.

Working fine for days.