Christophe LEROY <christophe.leroy@xxxxxx> writes: ... > > And I bisected its disappearance with commit 99cd1302327a2 ("powerpc: > Deliver SEGV signal on pkey violation") Whoa that's weird. > Looking at those two commits, especially the one which makes it > dissapear, I'm quite sceptic. Any idea on what could be the cause and/or > how to investigate further ? Are you sure it's not some corruption that just happens to be masked by that commit? I can't see anything in that commit that could explain that change in behaviour. The only real change is if you're hitting DSISR_KEYFAULT isn't it? What happens if you take 087003e9ef7c and apply the various hunks from 99cd1302327a2 gradually (or those that you can anyway)? cheers