[Bug 215445] AMDGPU -- UBSAN: invalid-load in amdgpu_dm.c:5882:84 - load of value 32 is not a valid value for type '_Bool'

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215445

--- Comment #7 from Bogdan (bogdan.pylypenko107 at gmail.com) ---
UBSAN <- Undefined Behaviour sanity checker
> Compile-time instrumentation is used to detect various undefined behaviours
> at runtime.
> For more details, see: Documentation/dev-tools/ubsan.rst

UBSAN is just a technology that help to detect various bugs, not a bug source.

I resolve problem by kernel rebuild:
- rebuild 5.15.12 with different kernel config - have no UBSAN warnings (big
changes made - can not detect which kernel config parameter resolve problem);
- update to 5.15.13 - have no UBSAN warnings, have single crash in amdgpu
driver with closing X subsystem (sysrq helps to restart display manager);
- update to 5.16.0 - have no UBSAN warnings, but have high latencies (12-15 ms)
in [drm_atomic_helper_wait_for_flip_done] in high loaded mode (detected by
latencytop program).

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