Messages in this thread | | | From | Dan Williams <> | Date | Mon, 30 Oct 2017 08:59:46 -0700 | Subject | Re: [pmem_attach_disk] WARNING: CPU: 46 PID: 518 at kernel/memremap.c:363 devm_memremap_pages+0x350/0x4b0 |
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On Mon, Oct 30, 2017 at 12:40 AM, Fengguang Wu <fengguang.wu@intel.com> wrote: > > CC nvdimm maintainers. > > On Sun, Oct 29, 2017 at 11:51:55PM +0100, Fengguang Wu wrote: >> >> Hi Linus, >> >> Up to now we see the below boot error/warnings when testing v4.14-rc6. >> >> They hit the RC release mainly due to various imperfections in 0day's >> auto bisection. So I manually list them here and CC the likely easy to >> debug ones to the corresponding maintainers in the followup emails. >> >> boot_successes: 4700 >> boot_failures: 247 > > > [...] > >> WARNING:at_kernel/memremap.c:#devm_memremap_pages: 1 > > > Bisect failed, hope it's not hard to debug: > > Start > [ 18.989316] devm_memremap_pages attempted on mixed region [mem 0x680000000-0x103dffffff flags 0x200]
This appears to be a problem in the test environment. "Persistent Memory" can only be specified on a minimum of a 128MB boundary if it intersects "System RAM". Assuming I did my math right this appears to end on 16MB boundary. Fixing this problem in the kernel would require this patch set:
"mm: sub-section memory hotplug support": https://lwn.net/Articles/707908/
...but I have abandoned / pushed that to the back of my queue since BIOS induced version of this problem does not appear to trigger in practice. I assume this test is using memmap=ss!nn?
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