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AJvYcCUm9+uyq/LqrxL0matLgPNLVx9sC1EUY0JvZINDDu1eSf+oxQyydii2HamF/8FdNdN+rw1WdfUDzg==@kvack.org X-Gm-Message-State: AOJu0Yz4Q1d9e7WfLmhoZb4qDrFe2Ks7mWeNlpr/9S5xisy5hzAC4Tn0 5KAg5A7mxLzc6wzysIf+81t+9B1b5HpJqkPmKfhrPiqiu8ziCrnJF6R9aXzhgb/5i8zKjUYxE4u JyMFVufCqLm6aqKE81/il7BJMLkP5rlhv/vbhdW1ASQvxhVviuIltYxHhaFw= MIME-Version: 1.0 X-Received: by 2002:a05:6820:1f05:b0:663:23a:caf4 with SMTP id 006d021491bc7-6630f0317cfmr888270eaf.2.1769760947492; Fri, 30 Jan 2026 00:15:47 -0800 (PST) Date: Fri, 30 Jan 2026 00:15:47 -0800 In-Reply-To: <20260130034818.472804-1-ziy@nvidia.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <697c68b3.a70a0220.9914.0032.GAE@google.com> Subject: [syzbot ci] Re: Separate compound page from folio From: syzbot ci To: akpm@linux-foundation.org, apopple@nvidia.com, axboe@kernel.dk, balbirs@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, david@kernel.org, dev.jain@arm.com, hannes@cmpxchg.org, io-uring@vger.kernel.org, jackmanb@google.com, jgg@nvidia.com, lance.yang@linux.dev, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, mhocko@suse.com, muchun.song@linux.dev, npache@redhat.com, osalvador@suse.de, rppt@kernel.org, ryan.roberts@arm.com, surenb@google.com, vbabka@suse.cz, willy@infradead.org, ziy@nvidia.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 66C18180006 X-Stat-Signature: q4zzu5ebu1rbee6d85hkhyxeq34gg3hw X-Rspam-User: X-HE-Tag: 1769760948-772329 X-HE-Meta: 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 /etf+IEq f/tHcxIqqEp+fN2MOIKYSaW+HGFPJInj X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: syzbot ci has tested the following series [v1] Separate compound page from folio https://lore.kernel.org/all/20260130034818.472804-1-ziy@nvidia.com * [RFC PATCH 1/5] io_uring: allocate folio in io_mem_alloc_compound() and function rename * [RFC PATCH 2/5] mm/huge_memory: use page_rmappable_folio() to convert after-split folios * [RFC PATCH 3/5] mm/hugetlb: set large_rmappable on hugetlb and avoid deferred_list handling * [RFC PATCH 4/5] mm: only use struct page in compound_nr() and compound_order() * [RFC PATCH 5/5] mm: code separation for compound page and folio and found the following issue: WARNING in __folio_large_mapcount_sanity_checks Full report is available here: https://ci.syzbot.org/series/f64f0297-d388-4cfa-b3be-f05819d0ce34 *** WARNING in __folio_large_mapcount_sanity_checks tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 0241748f8b68fc2bf637f4901b9d7ca660d177ca arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/76dc5ea6-0ff5-410b-8b1f-72e5607a704e/config C repro: https://ci.syzbot.org/findings/a308f1d6-69e2-4ebc-80a9-b51d9dc02851/c_repro syz repro: https://ci.syzbot.org/findings/a308f1d6-69e2-4ebc-80a9-b51d9dc02851/syz_repro ------------[ cut here ]------------ diff > folio_large_nr_pages(folio) WARNING: ./include/linux/rmap.h:148 at __folio_large_mapcount_sanity_checks+0x499/0x6b0 include/linux/rmap.h:148, CPU#1: syz.0.17/5988 Modules linked in: CPU: 1 UID: 0 PID: 5988 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:__folio_large_mapcount_sanity_checks+0x499/0x6b0 include/linux/rmap.h:148 Code: 5f 5d e9 4a 4e 64 09 cc e8 84 d8 aa ff 90 0f 0b 90 e9 82 fc ff ff e8 76 d8 aa ff 90 0f 0b 90 e9 8f fc ff ff e8 68 d8 aa ff 90 <0f> 0b 90 e9 b8 fc ff ff e8 5a d8 aa ff 90 0f 0b 90 e9 f2 fc ff ff RSP: 0018:ffffc900040e72f8 EFLAGS: 00010293 RAX: ffffffff8217c0f8 RBX: ffffea0006ef5c00 RCX: ffff888105fdba80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffea0006ef5c07 R09: 1ffffd4000ddeb80 R10: dffffc0000000000 R11: fffff94000ddeb81 R12: 0000000000000001 R13: 0000000000000000 R14: 1ffffd4000ddeb8f R15: ffffea0006ef5c78 FS: 00005555867b3500(0000) GS:ffff8882a9923000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000000c0 CR3: 0000000103ab0000 CR4: 00000000000006f0 Call Trace: folio_add_return_large_mapcount include/linux/rmap.h:184 [inline] __folio_add_rmap mm/rmap.c:1377 [inline] __folio_add_file_rmap mm/rmap.c:1696 [inline] folio_add_file_rmap_ptes+0x4c2/0xe60 mm/rmap.c:1722 insert_page_into_pte_locked+0x5ab/0x910 mm/memory.c:2378 insert_page+0x186/0x2d0 mm/memory.c:2398 packet_mmap+0x360/0x530 net/packet/af_packet.c:4622 vfs_mmap include/linux/fs.h:2053 [inline] mmap_file mm/internal.h:167 [inline] __mmap_new_file_vma mm/vma.c:2468 [inline] __mmap_new_vma mm/vma.c:2532 [inline] __mmap_region mm/vma.c:2759 [inline] mmap_region+0x18fe/0x2240 mm/vma.c:2837 do_mmap+0xc39/0x10c0 mm/mmap.c:559 vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581 ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:605 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5d7399acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe9f3eea78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f5d73c15fa0 RCX: 00007f5d7399acb9 RDX: 0000000000000002 RSI: 0000000000030000 RDI: 0000200000000000 RBP: 00007f5d73a08bf7 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5d73c15fac R14: 00007f5d73c15fa0 R15: 00007f5d73c15fa0 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.