Hi, On Thu, Apr 23, 2020 at 05:25:56PM -0400, Qian Cai wrote: > Compaction starts to crash below on linux-next today. The faulty page belongs to Node 0 DMA32 zone. > I’ll continue to narrow it down, but just want to give a headup in case someone could beat me to it. > > Debug output from free_area_init_core() > [ 0.000000] KK start page = ffffea0000000040, end page = ffffea0000040000, nid = 0 DMA > [ 0.000000] KK start page = ffffea0000040000, end page = ffffea0004000000, nid = 0 DMA32 > [ 0.000000] KK start page = ffffea0004000000, end page = ffffea0012000000, nid = 0 NORMAL > [ 0.000000] KK start page = ffffea0012000000, end page = ffffea0021fc0000, nid = 4 NORMAL > > I don’t understand how it could end up in such a situation. There are several recent patches look > more related than some others. Can you please add "mminit_loglevel=4 memblock=debug" to the kernel command line? > - mm: rework free_area_init*() funcitons > https://lore.kernel.org/linux-mm/20200412194859.12663-1-rppt@xxxxxxxxxx/ > Could this somehow allow an invalid pfn to escape into the page allocator? > Especially, is it related to skip the checks in memmap_init_zone()? > https://lore.kernel.org/linux-mm/20200412194859.12663-16-rppt@xxxxxxxxxx -- Sincerely yours, Mike.
