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Fri, 12 Dec 2025 15:14:58 +0000 (GMT) Date: Fri, 12 Dec 2025 16:14:57 +0100 From: Alexander Gordeev To: Andrew Morton , Vlastimil Babka , Johannes Weiner Cc: Marc Hartmayer , linux-mm@kvack.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm/page_alloc: change all pageblocks migrate type on coalescing Message-ID: <20251212151457.3898073Add-agordeev@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Cf8FJbrl c=1 sm=1 tr=0 ts=693c3175 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=BYGt3CUIH6UFlYqRJg4A:9 a=CjuIK1q_8ugA:10 X-Proofpoint-ORIG-GUID: bZlwOoOYlYMno1f9809YkAnL220E54Ot X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjA2MDAxNiBTYWx0ZWRfX3seQhtNlwR1x vwM2UsRLGmtrHSred9kyiBA/luTfhSW7wiPDsjhMR/Kz3Gr09GL00LrZoSOslyVHMyMHKrK0GFT ZAcEYcoGsbFaR2pXVGodfgLT7siRWtdDvJuWp36moQ5rG6ynWByIFZxyv7rJeWIDXBMIHqYyfkq 81JdFRtlMjHaqd7shbQWFLupUTDfp2DW9owlzSTC2q+qpTwZ91ndlSolwSOiIPZiKvIZ8/6Ikba on7tV+ADnyhs6trzAVNcW3dlHQ1m3vcA1O7gUDjY5TQACdiIfbbpCtS0ediLJJCwPZb6bk3+YCp bGzgmyoUzJGZKrQuoYMzMVLK5HASnhKD863mZu5ubJBd/epcZTzeZrsqG+7WYXLtAayVKvxvLT0 HMSgzE2ZBNDkPu5mlJ6mPlBXBSFt/A== X-Proofpoint-GUID: bZlwOoOYlYMno1f9809YkAnL220E54Ot X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-12_04,2025-12-11_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 bulkscore=0 malwarescore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 impostorscore=0 priorityscore=1501 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2512060016 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When a page is freed it coalesces with a buddy into a higher order page while possible. When the buddy page migrate type differs, it is expected to be updated to match the one of the page being freed. However, only the first pageblock of the buddy page is updated, while the rest of the pageblocks are left unchanged. That causes warnings in later expand() and other code paths (like below), since an inconsistency between migration type of the list containing the page and the page-owned pageblocks migration types is introduced. The issue is first exposed with commit e0932b6c1f94 ("mm: page_alloc: consolidate free page accounting"), where the warnings were introduced, but it is observed in earlier versions if similar warnings are added. [ 308.986589] ------------[ cut here ]------------ [ 308.987227] page type is 0, passed migratetype is 1 (nr=3D256) [ 308.987275] WARNING: CPU: 1 PID: 5224 at mm/page_alloc.c:812 expand+0x23= c/0x270 [ 308.987293] Modules linked in: algif_hash(E) af_alg(E) nft_fib_inet(E) n= ft_fib_ipv4(E) nft_fib_ipv6(E) nft_fib(E) nft_reject_inet(E) nf_reject_ipv4= (E) nf_reject_ipv6(E) nft_reject(E) nft_ct(E) nft_chain_nat(E) nf_nat(E) nf= _conntrack(E) nf_defrag_ipv6(E) nf_defrag_ipv4(E) nf_tables(E) s390_trng(E)= vfio_ccw(E) mdev(E) vfio_iommu_type1(E) vfio(E) sch_fq_codel(E) drm(E) i2c= _core(E) drm_panel_orientation_quirks(E) loop(E) nfnetlink(E) vsock_loopbac= k(E) vmw_vsock_virtio_transport_common(E) vsock(E) ctcm(E) fsm(E) diag288_w= dt(E) watchdog(E) zfcp(E) scsi_transport_fc(E) ghash_s390(E) prng(E) aes_s3= 90(E) des_generic(E) des_s390(E) libdes(E) sha3_512_s390(E) sha3_256_s390(E= ) sha_common(E) paes_s390(E) crypto_engine(E) pkey_cca(E) pkey_ep11(E) zcry= pt(E) rng_core(E) pkey_pckmo(E) pkey(E) autofs4(E) [ 308.987439] Unloaded tainted modules: hmac_s390(E):2 [ 308.987650] CPU: 1 UID: 0 PID: 5224 Comm: mempig_verify Kdump: loaded Ta= inted: G E 6.18.0-gcc-bpf-debug #431 PREEMPT [ 308.987657] Tainted: [E]=3DUNSIGNED_MODULE [ 308.987661] Hardware name: IBM 3906 M04 704 (z/VM 7.3.0) [ 308.987666] Krnl PSW : 0404f00180000000 00000349976fa600 (expand+0x240/0= x270) [ 308.987676] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:3 PM:= 0 RI:0 EA:3 [ 308.987682] Krnl GPRS: 0000034980000004 0000000000000005 000000000000003= 0 000003499a0e6d88 [ 308.987688] 0000000000000005 0000034980000005 000002be803ac00= 0 0000023efe6c8300 [ 308.987692] 0000000000000008 0000034998d57290 000002be0000010= 0 0000023e00000008 [ 308.987696] 0000000000000000 0000000000000000 00000349976fa5f= c 000002c99b1eb6f0 [ 308.987708] Krnl Code: 00000349976fa5f0: c020008a02f2 larl %r2,000003499= 883abd4 00000349976fa5f6: c0e5ffe3f4b5 brasl %r14,0000034= 997378f60 #00000349976fa5fc: af000000 mc 0,0 >00000349976fa600: a7f4ff4c brc 15,00000349976fa4= 98 00000349976fa604: b9040026 lgr %r2,%r6 00000349976fa608: c0300088317f larl %r3,000003499= 8800906 00000349976fa60e: c0e5fffdb6e1 brasl %r14,0000034= 9976b13d0 00000349976fa614: af000000 mc 0,0 [ 308.987734] Call Trace: [ 308.987738] [<00000349976fa600>] expand+0x240/0x270 [ 308.987744] ([<00000349976fa5fc>] expand+0x23c/0x270) [ 308.987749] [<00000349976ff95e>] rmqueue_bulk+0x71e/0x940 [ 308.987754] [<00000349976ffd7e>] __rmqueue_pcplist+0x1fe/0x2a0 [ 308.987759] [<0000034997700966>] rmqueue.isra.0+0xb46/0xf40 [ 308.987763] [<0000034997703ec8>] get_page_from_freelist+0x198/0x8d0 [ 308.987768] [<0000034997706fa8>] __alloc_frozen_pages_noprof+0x198/0x400 [ 308.987774] [<00000349977536f8>] alloc_pages_mpol+0xb8/0x220 [ 308.987781] [<0000034997753bf6>] folio_alloc_mpol_noprof+0x26/0xc0 [ 308.987786] [<0000034997753e4c>] vma_alloc_folio_noprof+0x6c/0xa0 [ 308.987791] [<0000034997775b22>] vma_alloc_anon_folio_pmd+0x42/0x240 [ 308.987799] [<000003499777bfea>] __do_huge_pmd_anonymous_page+0x3a/0x210 [ 308.987804] [<00000349976cb08e>] __handle_mm_fault+0x4de/0x500 [ 308.987809] [<00000349976cb14c>] handle_mm_fault+0x9c/0x3a0 [ 308.987813] [<000003499734d70e>] do_exception+0x1de/0x540 [ 308.987822] [<0000034998387390>] __do_pgm_check+0x130/0x220 [ 308.987830] [<000003499839a934>] pgm_check_handler+0x114/0x160 [ 308.987838] 3 locks held by mempig_verify/5224: [ 308.987842] #0: 0000023ea44c1e08 (vm_lock){++++}-{0:0}, at: lock_vma_un= der_rcu+0xb2/0x2a0 [ 308.987859] #1: 0000023ee4d41b18 (&pcp->lock){+.+.}-{2:2}, at: rmqueue.= isra.0+0xad6/0xf40 [ 308.987871] #2: 0000023efe6c8998 (&zone->lock){..-.}-{2:2}, at: rmqueue= _bulk+0x5a/0x940 [ 308.987886] Last Breaking-Event-Address: [ 308.987890] [<0000034997379096>] __warn_printk+0x136/0x140 [ 308.987897] irq event stamp: 52330356 [ 308.987901] hardirqs last enabled at (52330355): [<000003499838742e>] _= _do_pgm_check+0x1ce/0x220 [ 308.987907] hardirqs last disabled at (52330356): [<000003499839932e>] _= raw_spin_lock_irqsave+0x9e/0xe0 [ 308.987913] softirqs last enabled at (52329882): [<0000034997383786>] h= andle_softirqs+0x2c6/0x530 [ 308.987922] softirqs last disabled at (52329859): [<0000034997382f86>] _= _irq_exit_rcu+0x126/0x140 [ 308.987929] ---[ end trace 0000000000000000 ]--- [ 308.987936] ------------[ cut here ]------------ [ 308.987940] page type is 0, passed migratetype is 1 (nr=3D256) [ 308.987951] WARNING: CPU: 1 PID: 5224 at mm/page_alloc.c:860 __del_page_= from_free_list+0x1be/0x1e0 [ 308.987960] Modules linked in: algif_hash(E) af_alg(E) nft_fib_inet(E) n= ft_fib_ipv4(E) nft_fib_ipv6(E) nft_fib(E) nft_reject_inet(E) nf_reject_ipv4= (E) nf_reject_ipv6(E) nft_reject(E) nft_ct(E) nft_chain_nat(E) nf_nat(E) nf= _conntrack(E) nf_defrag_ipv6(E) nf_defrag_ipv4(E) nf_tables(E) s390_trng(E)= vfio_ccw(E) mdev(E) vfio_iommu_type1(E) vfio(E) sch_fq_codel(E) drm(E) i2c= _core(E) drm_panel_orientation_quirks(E) loop(E) nfnetlink(E) vsock_loopbac= k(E) vmw_vsock_virtio_transport_common(E) vsock(E) ctcm(E) fsm(E) diag288_w= dt(E) watchdog(E) zfcp(E) scsi_transport_fc(E) ghash_s390(E) prng(E) aes_s3= 90(E) des_generic(E) des_s390(E) libdes(E) sha3_512_s390(E) sha3_256_s390(E= ) sha_common(E) paes_s390(E) crypto_engine(E) pkey_cca(E) pkey_ep11(E) zcry= pt(E) rng_core(E) pkey_pckmo(E) pkey(E) autofs4(E) [ 308.988070] Unloaded tainted modules: hmac_s390(E):2 [ 308.988087] CPU: 1 UID: 0 PID: 5224 Comm: mempig_verify Kdump: loaded Ta= inted: G W E 6.18.0-gcc-bpf-debug #431 PREEMPT [ 308.988095] Tainted: [W]=3DWARN, [E]=3DUNSIGNED_MODULE [ 308.988100] Hardware name: IBM 3906 M04 704 (z/VM 7.3.0) [ 308.988105] Krnl PSW : 0404f00180000000 00000349976f9e32 (__del_page_fro= m_free_list+0x1c2/0x1e0) [ 308.988118] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:3 PM:= 0 RI:0 EA:3 [ 308.988127] Krnl GPRS: 0000034980000004 0000000000000005 000000000000003= 0 000003499a0e6d88 [ 308.988133] 0000000000000005 0000034980000005 0000034998d5729= 0 0000023efe6c8300 [ 308.988139] 0000000000000001 0000000000000008 000002be0000010= 0 000002be803ac000 [ 308.988144] 0000000000000000 0000000000000001 00000349976f9e2= e 000002c99b1eb728 [ 308.988153] Krnl Code: 00000349976f9e22: c020008a06d9 larl %r2,000003499= 883abd4 00000349976f9e28: c0e5ffe3f89c brasl %r14,0000034= 997378f60 #00000349976f9e2e: af000000 mc 0,0 >00000349976f9e32: a7f4ff4e brc 15,00000349976f9c= ce 00000349976f9e36: b904002b lgr %r2,%r11 00000349976f9e3a: c030008a06e7 larl %r3,000003499= 883ac08 00000349976f9e40: c0e5fffdbac8 brasl %r14,0000034= 9976b13d0 00000349976f9e46: af000000 mc 0,0 [ 308.988184] Call Trace: [ 308.988188] [<00000349976f9e32>] __del_page_from_free_list+0x1c2/0x1e0 [ 308.988195] ([<00000349976f9e2e>] __del_page_from_free_list+0x1be/0x1e0) [ 308.988202] [<00000349976ff946>] rmqueue_bulk+0x706/0x940 [ 308.988208] [<00000349976ffd7e>] __rmqueue_pcplist+0x1fe/0x2a0 [ 308.988214] [<0000034997700966>] rmqueue.isra.0+0xb46/0xf40 [ 308.988221] [<0000034997703ec8>] get_page_from_freelist+0x198/0x8d0 [ 308.988227] [<0000034997706fa8>] __alloc_frozen_pages_noprof+0x198/0x400 [ 308.988233] [<00000349977536f8>] alloc_pages_mpol+0xb8/0x220 [ 308.988240] [<0000034997753bf6>] folio_alloc_mpol_noprof+0x26/0xc0 [ 308.988247] [<0000034997753e4c>] vma_alloc_folio_noprof+0x6c/0xa0 [ 308.988253] [<0000034997775b22>] vma_alloc_anon_folio_pmd+0x42/0x240 [ 308.988260] [<000003499777bfea>] __do_huge_pmd_anonymous_page+0x3a/0x210 [ 308.988267] [<00000349976cb08e>] __handle_mm_fault+0x4de/0x500 [ 308.988273] [<00000349976cb14c>] handle_mm_fault+0x9c/0x3a0 [ 308.988279] [<000003499734d70e>] do_exception+0x1de/0x540 [ 308.988286] [<0000034998387390>] __do_pgm_check+0x130/0x220 [ 308.988293] [<000003499839a934>] pgm_check_handler+0x114/0x160 [ 308.988300] 3 locks held by mempig_verify/5224: [ 308.988305] #0: 0000023ea44c1e08 (vm_lock){++++}-{0:0}, at: lock_vma_un= der_rcu+0xb2/0x2a0 [ 308.988322] #1: 0000023ee4d41b18 (&pcp->lock){+.+.}-{2:2}, at: rmqueue.= isra.0+0xad6/0xf40 [ 308.988334] #2: 0000023efe6c8998 (&zone->lock){..-.}-{2:2}, at: rmqueue= _bulk+0x5a/0x940 [ 308.988346] Last Breaking-Event-Address: [ 308.988350] [<0000034997379096>] __warn_printk+0x136/0x140 [ 308.988356] irq event stamp: 52330356 [ 308.988360] hardirqs last enabled at (52330355): [<000003499838742e>] _= _do_pgm_check+0x1ce/0x220 [ 308.988366] hardirqs last disabled at (52330356): [<000003499839932e>] _= raw_spin_lock_irqsave+0x9e/0xe0 [ 308.988373] softirqs last enabled at (52329882): [<0000034997383786>] h= andle_softirqs+0x2c6/0x530 [ 308.988380] softirqs last disabled at (52329859): [<0000034997382f86>] _= _irq_exit_rcu+0x126/0x140 [ 308.988388] ---[ end trace 0000000000000000 ]--- Reported-by: Marc Hartmayer Closes: https://lore.kernel.org/linux-mm/87wmalyktd.fsf@linux.ibm.com/ Fixes: e0932b6c1f94 ("mm: page_alloc: consolidate free page accounting") Signed-off-by: Alexander Gordeev Acked-by: Vlastimil Babka --- mm/page_alloc.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index ed82ee55e66a..6e644f2744c2 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -913,6 +913,17 @@ buddy_merge_likely(unsigned long pfn, unsigned long bu= ddy_pfn, NULL) !=3D NULL; } =20 +static void change_pageblock_range(struct page *pageblock_page, + int start_order, int migratetype) +{ + int nr_pageblocks =3D 1 << (start_order - pageblock_order); + + while (nr_pageblocks--) { + set_pageblock_migratetype(pageblock_page, migratetype); + pageblock_page +=3D pageblock_nr_pages; + } +} + /* * Freeing function for a buddy system allocator. * @@ -999,7 +1010,7 @@ static inline void __free_one_page(struct page *page, * expand() down the line puts the sub-blocks * on the right freelists. */ - set_pageblock_migratetype(buddy, migratetype); + change_pageblock_range(buddy, order, migratetype); } =20 combined_pfn =3D buddy_pfn & pfn; @@ -2146,17 +2157,6 @@ bool pageblock_unisolate_and_move_free_pages(struct = zone *zone, struct page *pag =20 #endif /* CONFIG_MEMORY_ISOLATION */ =20 -static void change_pageblock_range(struct page *pageblock_page, - int start_order, int migratetype) -{ - int nr_pageblocks =3D 1 << (start_order - pageblock_order); - - while (nr_pageblocks--) { - set_pageblock_migratetype(pageblock_page, migratetype); - pageblock_page +=3D pageblock_nr_pages; - } -} - static inline bool boost_watermark(struct zone *zone) { unsigned long max_boost; --=20 2.51.0