On Thu, 24 Sep 2015, Kirill A. Shutemov wrote: > SLUB uses PG_locked as a bit spin locked. IIUC, tail pages should never > appear there. VM_BUG_ON() is added to make sure that this assumption is > correct. Correct. However, VM_BUG_ON is superfluous. If there is a tail page there then the information in the page will be not as expected (free list parameter f.e.) and things will fall apart rapidly with segfaults. -- 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>