17 Nov
2022
17 Nov
'22
11:54 p.m.
On 11/17/22 15:23, Marco Elver wrote:
Yes - it's the 'level != PG_LEVEL_4K'.
That plus the bisect made it pretty easy to find, thanks for the effort!
Could you double-check that the attached patch fixes it? It seemed to for me.
The issue was that the new "No changes, easy!" check in the suspect commit didn't check the cpa->force_split option. It didn't split down to 4k and then all hell broke loose.
Oh, and I totally misread the kfence ability to tolerate partial TLB flushes. Sorry for the noise there!