Hard freezes since v5.7-r3 on CPU-hungry applications

I still need confirmation but I think it's coming from 915ecbc4. The symptom is a sudden freeze of everything: can't ssh into the machine, can't switch VT, SysRq keys not working, only way is a power reset. It's not 100% reproducible, it happens after some time during a game or a compilation.

• I first checked if it was an upstream kernel regression by downgrading Linux 5.7.12 to 5.7.10 while keeping same v5.7-r3 but still had the issue.
• I removed the GPU OC/UV but still the same.
• I don't have any CPU OC.

I had no crash for a while with linux 5.8 but right after patching it with Project-C v5.8-r0 same type of crash happened less than 5mn into a game. Nothing was present in dmesg/journal.

Here is my kernel config: .config