From: Harry Yoo <harry.yoo@oracle.com>
To: kernel test robot <lkp@intel.com>
Cc: oe-kbuild-all@lists.linux.dev
Subject: Re: [PATCH V5 mm-hotfixes 2/3] mm: introduce and use {pgd,p4d}_populate_kernel()
Date: Mon, 18 Aug 2025 19:41:57 +0900 [thread overview]
Message-ID: <aKMDdR9K1V-cOeX5@harry> (raw)
In-Reply-To: <202508181636.0Rtk0T7x-lkp@intel.com>
On Mon, Aug 18, 2025 at 05:02:01PM +0800, kernel test robot wrote:
> Hi Harry,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on tip/master]
> [also build test ERROR on linus/master v6.17-rc2 next-20250818]
> [cannot apply to akpm-mm/mm-everything tip/x86/core tip/x86/mm tip/auto-latest dennis-percpu/for-next]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
This is based on akpm-mm/mm-hotfixes-unstable:
e4321cf73f53 mm/userfaultfd: fix kmap_local LIFO ordering for CONFIG_HIGHPTE
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch*_base_tree_information ]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Harry-Yoo/mm-move-page-table-sync-declarations-to-linux-pgtable-h/20250818-101531
> base: tip/master
> patch link: https://lore.kernel.org/r/20250818020206.4517-3-harry.yoo*40oracle.com
> patch subject: [PATCH V5 mm-hotfixes 2/3] mm: introduce and use {pgd,p4d}_populate_kernel()
> config: arm64-randconfig-001-20250818 (https://download.01.org/0day-ci/archive/20250818/202508181636.0Rtk0T7x-lkp@intel.com/config )
> compiler: aarch64-linux-gcc (GCC) 11.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250818/202508181636.0Rtk0T7x-lkp@intel.com/reproduce )
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202508181636.0Rtk0T7x-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> aarch64-linux-ld: mm/kasan/init.o: in function `zero_p4d_populate':
> >> mm/kasan/init.c:195:(.ref.text+0x374): undefined reference to `kasan_early_shadow_pud'
> >> mm/kasan/init.c:195:(.ref.text+0x374): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `kasan_early_shadow_pud'
> >> aarch64-linux-ld: mm/kasan/init.c:195:(.ref.text+0x378): undefined reference to `kasan_early_shadow_pud'
> aarch64-linux-ld: mm/kasan/init.o: in function `kasan_populate_early_shadow':
> mm/kasan/init.c:258:(.ref.text+0x41c): undefined reference to `kasan_early_shadow_pud'
> mm/kasan/init.c:258:(.ref.text+0x41c): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `kasan_early_shadow_pud'
> aarch64-linux-ld: mm/kasan/init.c:258:(.ref.text+0x420): undefined reference to `kasan_early_shadow_pud'
> >> aarch64-linux-ld: mm/kasan/init.c:255:(.ref.text+0x42c): undefined reference to `kasan_early_shadow_p4d'
> >> mm/kasan/init.c:255:(.ref.text+0x42c): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `kasan_early_shadow_p4d'
> aarch64-linux-ld: mm/kasan/init.c:255:(.ref.text+0x430): undefined reference to `kasan_early_shadow_p4d'
My patch series shouldn't be causing this.
Does this error trigger before applying my patch series?
--
Cheers,
Harry / Hyeonggon
> vim +195 mm/kasan/init.c
>
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 181
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 182 static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr,
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 183 unsigned long end)
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 184 {
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 185 p4d_t *p4d = p4d_offset(pgd, addr);
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 186 unsigned long next;
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 187
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 188 do {
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 189 next = p4d_addr_end(addr, end);
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 190 if (IS_ALIGNED(addr, P4D_SIZE) && end - addr >= P4D_SIZE) {
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 191 pud_t *pud;
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 192 pmd_t *pmd;
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 193
> a86b0f4e94542c mm/kasan/init.c Harry Yoo 2025-08-18 194 p4d_populate_kernel(addr, p4d,
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 @195 lm_alias(kasan_early_shadow_pud));
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 196 pud = pud_offset(p4d, addr);
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 197 pud_populate(&init_mm, pud,
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 198 lm_alias(kasan_early_shadow_pmd));
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 199 pmd = pmd_offset(pud, addr);
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 200 pmd_populate_kernel(&init_mm, pmd,
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 201 lm_alias(kasan_early_shadow_pte));
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 202 continue;
> 458f7920f9b1e6 mm/kasan/kasan_init.c Joonsoo Kim 2017-07-10 203 }
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 204
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 205 if (p4d_none(*p4d)) {
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 206 pud_t *p;
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 207
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 208 if (slab_is_available()) {
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 209 p = pud_alloc(&init_mm, p4d, addr);
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 210 if (!p)
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 211 return -ENOMEM;
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 212 } else {
> fb6d5c1d99ab69 mm/kasan/init.c Qing Zhang 2023-09-06 213 p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
> fb6d5c1d99ab69 mm/kasan/init.c Qing Zhang 2023-09-06 214 pud_init(p);
> a86b0f4e94542c mm/kasan/init.c Harry Yoo 2025-08-18 215 p4d_populate_kernel(addr, p4d, p);
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 216 }
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 217 }
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 218 zero_pud_populate(p4d, addr, next);
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 219 } while (p4d++, addr = next, addr != end);
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 220
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 221 return 0;
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 222 }
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 223
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 224 /**
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 225 * kasan_populate_early_shadow - populate shadow memory region with
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 226 * kasan_early_shadow_page
> 7b6889f54a3c8c mm/kasan/init.c Yu Kuai 2021-06-04 227 * @shadow_start: start of the memory range to populate
> 7b6889f54a3c8c mm/kasan/init.c Yu Kuai 2021-06-04 228 * @shadow_end: end of the memory range to populate
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 229 */
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 230 int __ref kasan_populate_early_shadow(const void *shadow_start,
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 231 const void *shadow_end)
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 232 {
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 233 unsigned long addr = (unsigned long)shadow_start;
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 234 unsigned long end = (unsigned long)shadow_end;
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 235 pgd_t *pgd = pgd_offset_k(addr);
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 236 unsigned long next;
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 237
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 238 do {
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 239 next = pgd_addr_end(addr, end);
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 240
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 241 if (IS_ALIGNED(addr, PGDIR_SIZE) && end - addr >= PGDIR_SIZE) {
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 242 p4d_t *p4d;
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 243 pud_t *pud;
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 244 pmd_t *pmd;
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 245
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 246 /*
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 247 * kasan_early_shadow_pud should be populated with pmds
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 248 * at this moment.
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 249 * [pud,pmd]_populate*() below needed only for
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 250 * 3,2 - level page tables where we don't have
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 251 * puds,pmds, so pgd_populate(), pud_populate()
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 252 * is noops.
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 253 */
> a86b0f4e94542c mm/kasan/init.c Harry Yoo 2025-08-18 254 pgd_populate_kernel(addr, pgd,
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 @255 lm_alias(kasan_early_shadow_p4d));
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 256 p4d = p4d_offset(pgd, addr);
> a86b0f4e94542c mm/kasan/init.c Harry Yoo 2025-08-18 257 p4d_populate_kernel(addr, p4d,
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 258 lm_alias(kasan_early_shadow_pud));
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 259 pud = pud_offset(p4d, addr);
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 260 pud_populate(&init_mm, pud,
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 261 lm_alias(kasan_early_shadow_pmd));
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 262 pmd = pmd_offset(pud, addr);
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 263 pmd_populate_kernel(&init_mm, pmd,
> 9577dd74864877 mm/kasan/init.c Andrey Konovalov 2018-12-28 264 lm_alias(kasan_early_shadow_pte));
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 265 continue;
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 266 }
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 267
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 268 if (pgd_none(*pgd)) {
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 269 p4d_t *p;
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 270
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 271 if (slab_is_available()) {
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 272 p = p4d_alloc(&init_mm, pgd, addr);
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 273 if (!p)
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 274 return -ENOMEM;
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 275 } else {
> a86b0f4e94542c mm/kasan/init.c Harry Yoo 2025-08-18 276 pgd_populate_kernel(addr, pgd,
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 277 early_alloc(PAGE_SIZE, NUMA_NO_NODE));
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 278 }
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 279 }
> c2febafc67734a mm/kasan/kasan_init.c Kirill A. Shutemov 2017-03-09 280 zero_p4d_populate(pgd, addr, next);
> 69786cdb379bbc mm/kasan/kasan_init.c Andrey Ryabinin 2015-08-13 281 } while (pgd++, addr = next, addr != end);
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 282
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 283 return 0;
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 284 }
> 0207df4fa1a869 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 285
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
next prev parent reply other threads:[~2025-08-18 10:42 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-18 2:02 [PATCH V5 mm-hotfixes 0/3] mm, x86: fix crash due to missing page table sync and make it harder to miss Harry Yoo
2025-08-18 2:02 ` [PATCH V5 mm-hotfixes 1/3] mm: move page table sync declarations to linux/pgtable.h Harry Yoo
2025-08-18 7:47 ` David Hildenbrand
2025-08-18 2:02 ` [PATCH V5 mm-hotfixes 2/3] mm: introduce and use {pgd,p4d}_populate_kernel() Harry Yoo
2025-08-18 7:48 ` David Hildenbrand
2025-08-18 9:02 ` kernel test robot
2025-08-18 10:41 ` Harry Yoo [this message]
2025-08-21 9:35 ` [PATCH] mm: fix KASAN build error due to p*d_populate_kernel() Harry Yoo
2025-08-21 9:38 ` kernel test robot
2025-08-21 10:10 ` Lorenzo Stoakes
2025-08-21 10:42 ` Harry Yoo
2025-08-21 11:46 ` Lorenzo Stoakes
2025-08-21 11:57 ` [PATCH v2] " Harry Yoo
2025-08-21 12:00 ` kernel test robot
2025-08-21 17:36 ` Dave Hansen
2025-08-22 1:11 ` Harry Yoo
2025-08-22 16:02 ` Andrey Ryabinin
2025-08-27 6:30 ` Harry Yoo
2025-08-22 17:08 ` Dave Hansen
2025-08-25 9:46 ` Andrey Ryabinin
2025-08-22 2:07 ` [PATCH v3] " Harry Yoo
2025-08-18 2:02 ` [PATCH V5 mm-hotfixes 3/3] x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() Harry Yoo
2025-08-18 7:49 ` David Hildenbrand
2025-08-18 7:50 ` [PATCH V5 mm-hotfixes 0/3] mm, x86: fix crash due to missing page table sync and make it harder to miss David Hildenbrand
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