Minecraft has been crashing when AFK recently, the log file (attached) recommended posting the logs to https://github.com/microsoft/openjdk/issues, and the bot sent me here.

Only recent change in the past week was installing Optifine, however this is occurring while running in Vanilla. I'll likely uninstall Optifine and see if that makes a difference, but sharing the logs in case you find others having the same issue.

A fatal error has been detected by the Java Runtime Environment:
SIGSEGV (0xb) at pc=0x00007fc9c34ac050, pid=4374, tid=4377

(full log attached)

System: Kernel: 5.4.0-88-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Cinnamon 5.0.5
wm: muffin dm: LightDM Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal
Machine: Type: Desktop Mobo: ASUSTeK model: PRIME X570-P v: Rev X.0x serial: <filter>
BIOS: American Megatrends v: 3001 date: 12/04/2020
CPU: Topology: 8-Core model: AMD Ryzen 7 3700X bits: 64 type: MT MCP arch: Zen
L2 cache: 4096 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 114991
Speed: 2195 MHz min/max: 2200/3600 MHz Core speeds (MHz): 1: 2195 2: 2196 3: 2195
4: 2193 5: 2191 6: 2196 7: 2196 8: 2194 9: 2196 10: 2205 11: 2195 12: 2192 13: 2196
14: 2196 15: 2196 16: 2195
Graphics: Device-1: AMD Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] driver: amdgpu
v: kernel bus ID: 09:00.0 chip ID: 1002:699f
Display: x11 server: X.Org 1.20.11 driver: amdgpu,ati unloaded: fbdev,modesetting,vesa
resolution: 1920x1080~60Hz, 1920x1080~60Hz
OpenGL:   renderer: Radeon RX550/550 Series (POLARIS12 DRM 3.35.0 5.4.0-88-generic LLVM 12.0.0)
v: 4.6 Mesa 21.0.3 direct render: Yes