Fixed here: https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git/commit/?h=akpm/mm&id=6a1830efaf3318696479475620414ccb703757a5
Sent from my phone, forgive formatting. On Fri, Aug 10, 2018, 9:18 AM Dave Jiang <[email protected]> wrote: > > > On 08/09/2018 07:53 PM, Theodore Y. Ts'o wrote: > > 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. > > Thanks Ted. I have updated the wiki Ross mentioned to reflect that. > > _______________________________________________ > Linux-nvdimm mailing list > [email protected] > https://lists.01.org/mailman/listinfo/linux-nvdimm > _______________________________________________ Linux-nvdimm mailing list [email protected] https://lists.01.org/mailman/listinfo/linux-nvdimm
