On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > I'll check with Martin, maybe it is actually trivial, then we can > > do a quick test it to rule that one out. > > Oh. I found a bug in __split_huge_pmd_locked(). Although, not sure if it's > _the_ bug. > > pmdp_invalidate() is called for the wrong address :-/ > I guess that can be destructive on the architecture, right? FWIW, arm64 ignores the address parameter for set_pmd_at, so this would only result in the TLBI nuking the wrong entries, which is going to be tricky to observe in practice given that we install a table entry immediately afterwards that maps the same pages. If s390 does more here (I see some magic asm using the address), that could be the answer... Will -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>