From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8096CE6FE24 for ; Tue, 23 Dec 2025 17:51:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E0B306B0089; Tue, 23 Dec 2025 12:51:02 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id DCBB16B008A; Tue, 23 Dec 2025 12:51:02 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CF83D6B008C; Tue, 23 Dec 2025 12:51:02 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id BA7DC6B0089 for ; Tue, 23 Dec 2025 12:51:02 -0500 (EST) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 62BB68A43D for ; Tue, 23 Dec 2025 17:51:02 +0000 (UTC) X-FDA: 84251476764.07.E606EFC Received: from mail-oi1-f199.google.com (mail-oi1-f199.google.com [209.85.167.199]) by imf02.hostedemail.com (Postfix) with ESMTP id 9308680009 for ; Tue, 23 Dec 2025 17:51:00 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none); spf=pass (imf02.hostedemail.com: domain of 3g9ZKaQkbAKweklWMXXQdMbbUP.SaaSXQgeQdOaZfQZf.OaY@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.167.199 as permitted sender) smtp.mailfrom=3g9ZKaQkbAKweklWMXXQdMbbUP.SaaSXQgeQdOaZfQZf.OaY@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1766512260; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references; bh=mwW/6sJQ0iBm/W5F2BR0R56wsyjr5B9PRL23bKwGSP0=; b=lyJtJEIo/0RpEQ5k3TEs2TB4FQnr5v4gDMPjz6z22oyZFTkGxbLvlX2WOjlCQmOnmo6tnq AFu6UZN5xPwzaiNlooZD65/QHrYqMpOi167R348zr0K8Mj1VDekeHKaj+40P9z1kZjwE3M WRzobpzBNaBq6YZyr07XD3MmvfZn6cs= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none); spf=pass (imf02.hostedemail.com: domain of 3g9ZKaQkbAKweklWMXXQdMbbUP.SaaSXQgeQdOaZfQZf.OaY@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.167.199 as permitted sender) smtp.mailfrom=3g9ZKaQkbAKweklWMXXQdMbbUP.SaaSXQgeQdOaZfQZf.OaY@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1766512260; a=rsa-sha256; cv=none; b=aCnh6onDbRBBP1Q2eOSS/yRP84Zk/PwZrk7L6e8wYF+wMWvWc/kYgDU68DD3/MEUIp+OXV qUhlnfGQ2zuuOfkTxL2g5W0gOGrE9vOZFO6kf1cZmSOrrjXKsY/XVH3i5MbUcOHyEBjJwX WAi4dx0T9ikO89etBa+Zrz9Lfk4sLp0= Received: by mail-oi1-f199.google.com with SMTP id 5614622812f47-4501735f488so6952278b6e.2 for ; Tue, 23 Dec 2025 09:51:00 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766512259; x=1767117059; h=cc:to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=mwW/6sJQ0iBm/W5F2BR0R56wsyjr5B9PRL23bKwGSP0=; b=lCXiAIhpKqxZqdEx6dnqascCzGbp6UqqOm0psGdr4NUAeUpENkK7lTo15OzA8/n3kL A20LUG1uQaWyqraY+skOZrZR5zoTWT6NcBIZ6eCOSPdaMjOwLTXyPoQut/Keetth6i+a V5WP7vb8g6T4/5snktHmyWurhGLsO5dFQx0M0VvmGuH60lMnHGcIevJaj8tWHOlYQ284 Mg1ASwB0kR3LjLKvvuXrglBaLMcpu8+fBLkoB701qZhFmjUeqjju4xhIrEoHiY4Sq6Xb xU/O4Iqc1QYMDWxU1UPDYoIeHdCfGAGJqw2SdrdQg1Sdl6/dkZr+bWBIcgsOOqOeEvQU BjZw== X-Forwarded-Encrypted: i=1; AJvYcCU7UEfzsJ0xw5CPJUvM5ZmtfZJ9Z5RIG2ZdoJpOW0z0cd6s+3ai6aa8wIVGw+a2VzUGCojs4pdzFA==@kvack.org X-Gm-Message-State: AOJu0YyhQR9ApPFrwAt7uSKHDKvHCCk2bz+lJ0ed8Kq76v4lqzoaFzN1 MzpVHf0/JbkYfgGdvNUCeqjsft2eMDxGo6EuyKH3sYSNjugNbuaQ9jQt9C3l09/G7e1ZaLKpk15 YQvZ+8QFV4FT4VNNPCHQR4aaAOiz/3WoMthWKGnwHMEVbQckexiNLqPT3S/I= X-Google-Smtp-Source: AGHT+IEaUWdkY2pa1Ziiq7hjGtHuN4V6dROmOIZErMnnE/rfQXtpgkNktKXLyHDpXp1cJFT7ib6EUG/QWK5m8Xb04QmhAXoKAz/k MIME-Version: 1.0 X-Received: by 2002:a4a:bd0e:0:b0:65b:33ec:1bb3 with SMTP id 006d021491bc7-65d0ec33893mr4579322eaf.80.1766512259503; Tue, 23 Dec 2025 09:50:59 -0800 (PST) Date: Tue, 23 Dec 2025 09:50:59 -0800 In-Reply-To: <20251223122539.10726-1-richard.weiyang@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <694ad683.050a0220.35954c.0004.GAE@google.com> Subject: [syzbot ci] Re: mm/huge_memory: consolidate order-related checks into folio_check_splittable() From: syzbot ci To: akpm@linux-foundation.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, david@kernel.org, dev.jain@arm.com, lance.yang@linux.dev, liam.howlett@oracle.com, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, npache@redhat.com, richard.weiyang@gmail.com, ryan.roberts@arm.com, ziy@nvidia.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 9308680009 X-Stat-Signature: ek7x6b4x61pp6pnwoc4x4yneu9fh1mru X-HE-Tag: 1766512260-386573 X-HE-Meta: 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 GfRmlXtY 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 wJF7lsuF 1+1EIsALTtla9BcvFMA5WtncPnZtgU0PxSkVdTEhfZ4Z5NglxM6X3mRcDG+WrlNDcylrdOfFD0DlnMgVTWVarpOkcFCZ8r96LNbV6wnacitxyP/yU9ojPwoE8+NGLp1zQvUS0vpCeGeGy0Mkzbxxbw== 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 [v2] mm/huge_memory: consolidate order-related checks into folio_check_splittable() https://lore.kernel.org/all/20251223122539.10726-1-richard.weiyang@gmail.com * [Patch v2] mm/huge_memory: consolidate order-related checks into folio_check_splittable() and found the following issue: WARNING in __folio_split Full report is available here: https://ci.syzbot.org/series/7e34013d-ed08-40e1-99b7-8fd118dce84f *** WARNING in __folio_split tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: c642ecda5b136882e518d8303863473c0d21ab2f arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/2edb2dc5-42c6-4557-a194-921c57fd9eb1/config C repro: https://ci.syzbot.org/findings/8349b674-5790-4507-97cd-03697ec93cb0/c_repro syz repro: https://ci.syzbot.org/findings/8349b674-5790-4507-97cd-03697ec93cb0/syz_repro ------------[ cut here ]------------ Tried to split an unsplittable folio WARNING: mm/huge_memory.c:3970 at __folio_split+0xfe7/0x1370 mm/huge_memory.c:3970, CPU#1: syz.0.17/5997 Modules linked in: CPU: 1 UID: 0 PID: 5997 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_split+0xfe7/0x1370 mm/huge_memory.c:3970 Code: fe c6 05 a5 f8 3e 0d 01 90 0f 0b 90 e9 0d f4 ff ff e8 4d 78 94 ff 49 ff cd e9 d1 f4 ff ff e8 40 78 94 ff 48 8d 3d 69 47 5a 0d <67> 48 0f b9 3a 41 bd ea ff ff ff e9 7c fe ff ff 44 89 7c 24 34 44 RSP: 0018:ffffc900036d6d60 EFLAGS: 00010293 RAX: ffffffff822d4360 RBX: ffffea0005a4b008 RCX: ffff8881047fd7c0 RDX: 0000000000000000 RSI: ffffffff8e06e540 RDI: ffffffff8f878ad0 RBP: ffffc900036d6ef0 R08: ffff8881047fd7c0 R09: 0000000000000002 R10: 00000000ffffffea R11: 0000000000000000 R12: 0000000000000004 R13: 00000000ffffffea R14: ffffea0005a4b000 R15: 1ffffd4000b49603 FS: 0000555591a60500(0000) GS:ffff8882a9e32000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30d63fff CR3: 0000000100f30000 CR4: 00000000000006f0 Call Trace: madvise_cold_or_pageout_pte_range+0xbf3/0x1ce0 mm/madvise.c:503 walk_pmd_range mm/pagewalk.c:130 [inline] walk_pud_range mm/pagewalk.c:224 [inline] walk_p4d_range mm/pagewalk.c:262 [inline] walk_pgd_range+0x1037/0x1d30 mm/pagewalk.c:303 __walk_page_range+0x14c/0x710 mm/pagewalk.c:410 walk_page_range_vma_unsafe+0x34c/0x400 mm/pagewalk.c:714 madvise_pageout_page_range mm/madvise.c:622 [inline] madvise_pageout mm/madvise.c:647 [inline] madvise_vma_behavior+0x30c7/0x4420 mm/madvise.c:1366 madvise_walk_vmas+0x575/0xaf0 mm/madvise.c:1721 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1937 do_madvise+0x1bc/0x270 mm/madvise.c:2030 __do_sys_madvise mm/madvise.c:2039 [inline] __se_sys_madvise mm/madvise.c:2037 [inline] __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:2037 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff69838f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff82001dd8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007ff6985e5fa0 RCX: 00007ff69838f7c9 RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007ff6983f297f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff6985e5fa0 R14: 00007ff6985e5fa0 R15: 0000000000000003 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: c6 05 a5 f8 3e 0d 01 movb $0x1,0xd3ef8a5(%rip) # 0xd3ef8ac 7: 90 nop 8: 0f 0b ud2 a: 90 nop b: e9 0d f4 ff ff jmp 0xfffff41d 10: e8 4d 78 94 ff call 0xff947862 15: 49 ff cd dec %r13 18: e9 d1 f4 ff ff jmp 0xfffff4ee 1d: e8 40 78 94 ff call 0xff947862 22: 48 8d 3d 69 47 5a 0d lea 0xd5a4769(%rip),%rdi # 0xd5a4792 * 29: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2e: 41 bd ea ff ff ff mov $0xffffffea,%r13d 34: e9 7c fe ff ff jmp 0xfffffeb5 39: 44 89 7c 24 34 mov %r15d,0x34(%rsp) 3e: 44 rex.R *** 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.