Re: Crash in MM code in v4.4.y, v4.9.y with TRANSPARENT_HUGEPAGE enabled

From: Michal Hocko
Date: Mon Aug 20 2018 - 12:29:44 EST


On Fri 17-08-18 15:27:33, Guenter Roeck wrote:
> Hi,
>
> the following crash is seen in v4.4.148, v4.4.149, v4.9.120, and v4.9.121
> with CONFIG_TRANSPARENT_HUGEPAGE=y, CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y.

Could you try to apply fd7e315988b7 ("x86/mm: Simplify p[g4um]d_page()
macros"). I do not see it in stable 4.4 tree and it has been introduced
much later in 4.14. This one gave us quite some headache because it is
soooo easy to overlook.
--
Michal Hocko
SUSE Labs