On Thu, Mar 21, 2024 at 05:49:49PM +0800, Muchun Song wrote: > There are some more page dumping information from console: > > [ 61.367144][ T42] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888028132880 pfn:0x28130 > [ 61.371430][ T42] flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) > [ 61.374455][ T42] page_type: 0xffffffff() > [ 61.376096][ T42] raw: 00fff80000000000 ffff888015ecd540 dead000000000100 0000000000000000 > [ 61.379994][ T42] raw: ffff888028132880 0000000000190000 00000000ffffffff 0000000000000000 > > Alright, the page is freed (with a refcount of 0). Yes, basically the page changed betwen folio_test_large() (returned true for PG_Head) and the call to const_folio_flags() (which now returned false for PG_Head). As David pointed out, Willy is working on making PageHutelb more robust [1]. [1] https://lore.kernel.org/linux-mm/20240314012506.1600378-1-willy@xxxxxxxxxxxxx/ -- Oscar Salvador SUSE Labs
