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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" 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.