On Tue, Jul 31, 2018 at 01:27:15PM -0700, Dave Jiang wrote:
>
> On 7/31/2018 12:36 PM, Ross Zwisler wrote:
> > On Mon, Jul 30, 2018 at 07:53:12PM -0400, Theodore Y. Ts'o wrote:
> > > In newer kernels, it looks like you can't use /dev/pmem0 for DAX
> > > unless it's marked as being DAX capable. This appears to require
> > > CONFIG_NVDIMM_PFN. But when I tried to build a kernel with that
> > > configured, I get the following BUG:
> >
> > You're using the memmap kernel command line parameter to reserve normal
> > memory to be treated as normal memory, but you've also got kernel address
> > randomization turned on in your kernel config:
> >
> > CONFIG_RANDOMIZE_BASE=y
> > CONFIG_RANDOMIZE_MEMORY=y
> >
> > You need to turn these off for the memmap kernel command line parameter,
> > else
> > the memory we're using could overlap with addresses used for other things.
>
> I believe this issue was fixed a while back. Although we probably can see if
> that is the issue or something else.
I turned off RANDOMIZE_BASE and RANDOMIZE_MEMORY, but that didn't fix
my problem.
It turns out the problem was KASAN. It looks like using memmap to
create test /dev/pmemX devices is not compatible with CONFIG_KASAN
being enabled.
So I have a workaround for now, but it seems this to be a bug in
KASAN, or at least an unfortunate interaction between KASAN and
NVDIMM_PFN.
- Ted
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