Comment 16 for bug 1910866

And the bisect between 5.4.78 (good) and 5.8.18 (bad).

The following results with the mainline kernel
v5.8.18/ FAIL
v5.8.4/ FAIL
v5.8-rc5/ FAIL
v5.8-rc1/ FAIL
v5.7.19/ PASS
v5.7.18/ PASS
v5.7.16/ PASS
v5.6.14/ PASS
v5.4.78/ PASS

From these and the previous comment's results it appears that the issue was introduced with 5.8-rc1 and then was fixed with 5.9.9 or 5.9.10. (it is unfortunate that 5.9.9 is missing so I cannot try it).

@kaihengfeng let me know if there is any other information I can provide.