On Mon, May 06, 2024 at 11:54:49AM +0200, David Hildenbrand wrote: > But, could it be that we failing during compaction_alloc() [lr : > compaction_alloc+0x220/0x804] and have an issue during > set_pfnblock_flags_mask() on a page that sits on the isolated freelist? > Similarly, memory hotunplug should not be able to mess up here. But pageblock_flags is something that gets initialized at boot time and never touched again (for already present sections). There are two paths to get it: section_to_usemap(__pfn_to_section(pfn)) or page_zone(page)->pageblock_flags Assuming the we somehow fail in compaction_alloc() and get a bad page or NULL, we should crash before reaching to the point where we ask for pageblock_flags. -- Oscar Salvador SUSE Labs
