28 Feb
2018
28 Feb
'18
10:23 a.m.
On Mon, Feb 26, 2018 at 11:30:50AM +0000, Will Deacon wrote:
Damnit, sorry again. I changed the argument order of phys_to_ttbr along the way, so must've confused myself during the backporting exercise. It's also one of those things that will lead to potential TLB corruption in rare circumstances where the junk in TTBR1 ends up giving a valid translation, so it didn't crop up in my testing. How did Nicolas see this? The bug report I saw didn't look related.
FWIW, we've been hitting this bug with a distribution backport on ThunderX2 on every boot. Due to bad luck there was a non-zero value in TTBR1 that crashed the kernel immediately and dropped us to firmware.
--Jan