Hi Gavin, On Fri, 2016-25-03 at 16:05:29 UTC, Gavin Shan wrote: > During deferred page initialization, the pages are moved from memblock > or bootmem to buddy allocator without checking they were reserved. Those > reserved pages can be reallocated to somebody else by buddy/slab allocator. > It leads to memory corruption and potential kernel crash eventually. Can you give me a bit more detail on what the bug is? I haven't seen any issues on my systems, but I realise now I haven't enabled DEFERRED_STRUCT_PAGE_INIT - I assumed it was enabled by default. How did this get tested before submission? > This fixes above issue by: > > * Deferred releasing bootmem bitmap until the completion of deferred > page initialization. As I said in my other mail, we don't support bootmem anymore. So please resend with just the non-bootmem fixes. cheers -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>