Tetsuo Handa wrote: > Michal Hocko wrote: > > All of those seem to be file pages. So maybe try to use a different FS. > > Maybe that's the next thing I should try. xfs versus ext4 => Both triggers the bug Linus Torvalds wrote: > On Thu, Jan 11, 2018 at 5:31 PM, Tetsuo Handa > <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote: > > > > Thus, I suspect that somewhere is confusing HighMem pages and !HighMem pages. > > Hmm. I can't even imagine how you'd do that. > > Sure, if you take page_address() to get a kmap'ed linear address, and > then feed that linear address back to virt_to_page(), you'd certainly > get a crazy page. But that would be insane.. I don't see how you'd do > that. > > Hmm. Do you have CONFIG_DEBUG_VIRTUAL enabled? That should catch at > least the above case, it should enable a debugging version of > __virt_to_phys() and use it. > CONFIG_DEBUG_VIRTUAL=y versus CONFIG_DEBUG_VIRTUAL=n => No difference No mem= parameter versus mem=768M => Cannot trigger if mem=768M (i.e. not using HighMem) CONFIG_SLUB=y versus CONFIG_SLAB=y => Both triggers the bug CONFIG_DEBUG_PAGEALLOC=y versus CONFIG_DEBUG_PAGEALLOC=n => Cannot trigger if CONFIG_DEBUG_PAGEALLOC=n I don't know whether there is a bug in CONFIG_DEBUG_PAGEALLOC=y code. Config is at http://I-love.SAKURA.ne.jp/tmp/config-4.15-rc7-min .
