tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y head: f52a40401ee9825556cc803c110c67bfec5f6b94 commit: c1f729c7dec0df04d62550d981af849f970a660d [3113/4278] mm: mempolicy: fix potential pte_unmap_unlock pte error config: ia64-randconfig-r036-20210914 (attached as .config) compiler: ia64-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-5.4.y git checkout c1f729c7dec0df04d62550d981af849f970a660d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from arch/ia64/include/asm/pgtable.h:154, from include/linux/mm.h:99, from include/linux/dax.h:6, from include/linux/mempolicy.h:11, from mm/mempolicy.c:70: arch/ia64/include/asm/mmu_context.h: In function 'reload_context': arch/ia64/include/asm/mmu_context.h:137:48: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable] 137 | unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4; | ^~~~~~~ mm/mempolicy.c: In function 'queue_pages_pte_range': 499 | pte_t *pte, *mapped_pte; | ^~~~~~~~~~ vim +/mapped_pte +499 mm/mempolicy.c 478 479 /* 480 * Scan through pages checking if pages follow certain conditions, 481 * and move them to the pagelist if they do. 482 * 483 * queue_pages_pte_range() has three possible return values: 484 * 0 - pages are placed on the right node or queued successfully. 485 * 1 - there is unmovable page, and MPOL_MF_MOVE* & MPOL_MF_STRICT were 486 * specified. 487 * -EIO - only MPOL_MF_STRICT was specified and an existing page was already 488 * on a node that does not follow the policy. 489 */ 490 static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr, 491 unsigned long end, struct mm_walk *walk) 492 { 493 struct vm_area_struct *vma = walk->vma; 494 struct page *page; 495 struct queue_pages *qp = walk->private; 496 unsigned long flags = qp->flags; 497 int ret; 498 bool has_unmovable = false; 500 spinlock_t *ptl; 501 502 ptl = pmd_trans_huge_lock(pmd, vma); 503 if (ptl) { 504 ret = queue_pages_pmd(pmd, ptl, addr, end, walk); 505 if (ret != 2) 506 return ret; 507 } 508 /* THP was split, fall through to pte walk */ 509 510 if (pmd_trans_unstable(pmd)) 511 return 0; 512 513 mapped_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); 514 for (; addr != end; pte++, addr += PAGE_SIZE) { 515 if (!pte_present(*pte)) 516 continue; 517 page = vm_normal_page(vma, addr, *pte); 518 if (!page) 519 continue; 520 /* 521 * vm_normal_page() filters out zero pages, but there might 522 * still be PageReserved pages to skip, perhaps in a VDSO. 523 */ 524 if (PageReserved(page)) 525 continue; 526 if (!queue_pages_required(page, qp)) 527 continue; 528 if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { 529 /* MPOL_MF_STRICT must be specified if we get here */ 530 if (!vma_migratable(vma)) { 531 has_unmovable = true; 532 break; 533 } 534 535 /* 536 * Do not abort immediately since there may be 537 * temporary off LRU pages in the range. Still 538 * need migrate other LRU pages. 539 */ 540 if (migrate_page_add(page, qp->pagelist, flags)) 541 has_unmovable = true; 542 } else 543 break; 544 } 545 pte_unmap_unlock(mapped_pte, ptl); 546 cond_resched(); 547 548 if (has_unmovable) 549 return 1; 550 551 return addr != end ? -EIO : 0; 552 } 553 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org