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AHgh+Rr259Da7MJTqW/Uh4CA7AhCI6jhP78hjXW9RXz3+boV4CLLVIT9FVMoVox7nkU8inZQt4IXcgu2/aDV8NU=@vger.kernel.org X-Gm-Message-State: AOJu0Yxazm1RMLorDv2NknBhD5yEVRDm5ClGVc4NKQrGTqnJ9b76EOnt 9IDl/LBwHFZ6ieCIgR0c8kCQfyy+LJZ2S7pVqVYljB93CzG3AROjdyGYzhf07gvbd2RJjZWeQqX o31plN6p8nr2v3vueH4QTLiWGoUpc/bo8zYSkXzHcfMIeGuOS5Oj0ABysARc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4c86:b0:6a1:50eb:2119 with SMTP id 006d021491bc7-6a39a82e4d7mr10003854eaf.61.1784094928744; Tue, 14 Jul 2026 22:55:28 -0700 (PDT) Date: Tue, 14 Jul 2026 22:55:28 -0700 In-Reply-To: <20260714122344.351895-1-kirill@shutemov.name> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a5720d0.c90005c7.37d349.0043.GAE@google.com> Subject: [syzbot ci] Re: mm: fix inode UAF when splitting a file folio past EOF From: syzbot ci To: akpm@linux-foundation.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, david@kernel.org, dev.jain@arm.com, hao_zhang_kdev@163.com, kas@kernel.org, kirill@shutemov.name, lance.yang@linux.dev, liam@infradead.org, linmiaohe@huawei.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, nao.horiguchi@gmail.com, npache@redhat.com, ryan.roberts@arm.com, stable@vger.kernel.org, usama.arif@linux.dev, zhanghao1@kylinos.cn, 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: fix inode UAF when splitting a file folio past EOF https://lore.kernel.org/all/20260714122344.351895-1-kirill@shutemov.name * [PATCH v2 1/5] mm/memory-failure: keep the folio, not the poisoned subpage, locked across split * [PATCH v2 2/5] mm/huge_memory: refuse to split a file folio when the anchor is beyond EOF * [PATCH v2 3/5] mm/huge_memory: remove unused split_huge_page_to_order() * [PATCH v2 4/5] mm/huge_memory: remove unused can_split_folio() * [PATCH v2 5/5] mm/huge_memory: fold split_folio_to_list_to_order() into split_folio_to_order() and found the following issues: * kernel BUG in __page_table_check_zero * kernel BUG in folio_isolate_lru * kernel BUG in memory_failure Full report is available here: https://ci.syzbot.org/series/6cad3430-1f9b-4a56-b60a-ef3ed2833e15 *** kernel BUG in __page_table_check_zero tree: bpf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git base: 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 arch: amd64 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 config: https://ci.syzbot.org/builds/8d6a621e-aae6-4f99-8e0e-d0e02ddbed71/config syz repro: https://ci.syzbot.org/findings/1619ac56-823a-4cc2-975b-bbb1c1742447/syz_repro Soft offlining pfn 0x120f0e at process virtual address 0x20000010e000 ------------[ cut here ]------------ kernel BUG at mm/page_table_check.c:142! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 5870 Comm: syz.1.18 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:__page_table_check_zero+0x416/0x430 mm/page_table_check.c:142 Code: f3 ff e9 4e fc ff ff e8 78 70 85 ff 89 ea be 01 00 00 00 48 c7 c7 a0 c4 ac 8e e8 45 29 b7 02 e9 48 fd ff ff e8 5b 70 85 ff 90 <0f> 0b e8 53 70 85 ff 90 0f 0b e8 4b 70 85 ff 90 0f 0b 0f 1f 84 00 RSP: 0018:ffffc900017e7948 EFLAGS: 00010293 RAX: ffffffff8240f325 RBX: ffff88810544b4a8 RCX: ffff88810c68bb80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffff88810544b4ab R09: 1ffff11020a89695 R10: dffffc0000000000 R11: ffffed1020a89696 R12: 0000000000000001 R13: ffff88810544b460 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fb17e6b86c0(0000) GS:ffff88818dc0e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2353670000 CR3: 0000000109db2000 CR4: 00000000000006f0 Call Trace: __folio_put+0x4b3/0x590 mm/swap.c:112 folio_put include/linux/mm.h:2124 [inline] put_page include/linux/mm.h:2193 [inline] page_handle_poison+0x35d/0x4a0 mm/memory-failure.c:204 soft_offline_in_use_page mm/memory-failure.c:2861 [inline] soft_offline_page+0xd1d/0x1560 mm/memory-failure.c:2952 madvise_inject_error mm/madvise.c:1476 [inline] madvise_do_behavior+0x319/0x930 mm/madvise.c:1897 do_madvise+0x327/0x3a0 mm/madvise.c:2005 __do_sys_madvise mm/madvise.c:2014 [inline] __se_sys_madvise mm/madvise.c:2012 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2012 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb17d79ce59 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:00007fb17e6b8028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fb17da15fa0 RCX: 00007fb17d79ce59 RDX: 0000000000000065 RSI: 0000000000002000 RDI: 000020000010e000 RBP: 00007fb17d832e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb17da16038 R14: 00007fb17da15fa0 R15: 00007ffd7e9be1d8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__page_table_check_zero+0x416/0x430 mm/page_table_check.c:142 Code: f3 ff e9 4e fc ff ff e8 78 70 85 ff 89 ea be 01 00 00 00 48 c7 c7 a0 c4 ac 8e e8 45 29 b7 02 e9 48 fd ff ff e8 5b 70 85 ff 90 <0f> 0b e8 53 70 85 ff 90 0f 0b e8 4b 70 85 ff 90 0f 0b 0f 1f 84 00 RSP: 0018:ffffc900017e7948 EFLAGS: 00010293 RAX: ffffffff8240f325 RBX: ffff88810544b4a8 RCX: ffff88810c68bb80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffff88810544b4ab R09: 1ffff11020a89695 R10: dffffc0000000000 R11: ffffed1020a89696 R12: 0000000000000001 R13: ffff88810544b460 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fb17e6b86c0(0000) GS:ffff88818dc0e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb17d7ea540 CR3: 0000000109db2000 CR4: 00000000000006f0 *** kernel BUG in folio_isolate_lru tree: bpf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git base: 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 arch: amd64 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 config: https://ci.syzbot.org/builds/8d6a621e-aae6-4f99-8e0e-d0e02ddbed71/config syz repro: https://ci.syzbot.org/findings/7857300c-5c56-4b88-9f60-6f1f3603e3f1/syz_repro do_madvise+0x327/0x3a0 mm/madvise.c:2005 __do_sys_madvise mm/madvise.c:2014 [inline] __se_sys_madvise mm/madvise.c:2012 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2012 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/vmscan.c:1803! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 5810 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_isolate_lru+0x8ad/0x990 mm/vmscan.c:1803 Code: 38 c1 0f 8c 75 fd ff ff 4c 89 f7 e8 ad 0e 28 00 e9 68 fd ff ff e8 d3 2b ba ff 4c 89 f7 48 c7 c6 20 5f d8 8b e8 84 d9 1b ff 90 <0f> 0b e8 bc 2b ba ff 4c 89 f7 48 c7 c6 60 8e d8 8b e8 6d d9 1b ff RSP: 0018:ffffc90003c678d8 EFLAGS: 00010246 RAX: 2554150cb728ac00 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000006 RSI: ffffffff8dfe9eba RDI: 00000000ffffffff RBP: 1ffffd40000f9d26 R08: ffffffff90334ef7 R09: 1ffffffff20669de R10: dffffc0000000000 R11: fffffbfff20669df R12: dffffc0000000000 R13: 0000000000100010 R14: ffffea00007ce900 R15: ffffea00007ce934 FS: 00007fa1793946c0(0000) GS:ffff88818dc0e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005640d3daa058 CR3: 00000001696d8000 CR4: 00000000000006f0 Call Trace: delete_from_lru_cache+0x1a/0x1e0 mm/memory-failure.c:900 me_pagecache_clean+0x58/0x230 mm/memory-failure.c:1015 page_action mm/memory-failure.c:1298 [inline] identify_page_state+0x13c/0x190 mm/memory-failure.c:1649 memory_failure+0x2fff/0x3380 mm/memory-failure.c:2548 madvise_inject_error mm/madvise.c:1480 [inline] madvise_do_behavior+0x344/0x930 mm/madvise.c:1897 do_madvise+0x327/0x3a0 mm/madvise.c:2005 __do_sys_madvise mm/madvise.c:2014 [inline] __se_sys_madvise mm/madvise.c:2012 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2012 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa17859ce59 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:00007fa179394028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fa178815fa0 RCX: 00007fa17859ce59 RDX: 0000000000000064 RSI: 0000000000002000 RDI: 00002000005a4000 RBP: 00007fa178632e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa178816038 R14: 00007fa178815fa0 R15: 00007fff254e3208 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:folio_isolate_lru+0x8ad/0x990 mm/vmscan.c:1803 Code: 38 c1 0f 8c 75 fd ff ff 4c 89 f7 e8 ad 0e 28 00 e9 68 fd ff ff e8 d3 2b ba ff 4c 89 f7 48 c7 c6 20 5f d8 8b e8 84 d9 1b ff 90 <0f> 0b e8 bc 2b ba ff 4c 89 f7 48 c7 c6 60 8e d8 8b e8 6d d9 1b ff RSP: 0018:ffffc90003c678d8 EFLAGS: 00010246 RAX: 2554150cb728ac00 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000006 RSI: ffffffff8dfe9eba RDI: 00000000ffffffff RBP: 1ffffd40000f9d26 R08: ffffffff90334ef7 R09: 1ffffffff20669de R10: dffffc0000000000 R11: fffffbfff20669df R12: dffffc0000000000 R13: 0000000000100010 R14: ffffea00007ce900 R15: ffffea00007ce934 FS: 00007fa1793946c0(0000) GS:ffff88818dc0e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005640d3daa058 CR3: 00000001696d8000 CR4: 00000000000006f0 *** kernel BUG in memory_failure tree: bpf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git base: 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 arch: amd64 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 config: https://ci.syzbot.org/builds/8d6a621e-aae6-4f99-8e0e-d0e02ddbed71/config syz repro: https://ci.syzbot.org/findings/6feafe6c-6796-475f-9aca-225a9d35747c/syz_repro do_madvise+0x327/0x3a0 mm/madvise.c:2005 __do_sys_madvise mm/madvise.c:2014 [inline] __se_sys_madvise mm/madvise.c:2012 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2012 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/memory-failure.c:2483! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 5850 Comm: syz.1.18 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:memory_failure+0x3373/0x3380 mm/memory-failure.c:2483 Code: cb 87 ff 48 89 df 48 c7 c6 e0 a2 dd 8b e8 45 79 e9 fe 90 0f 0b e8 7d cb 87 ff 4c 89 f7 48 c7 c6 40 93 dd 8b e8 2e 79 e9 fe 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900036efa00 EFLAGS: 00010246 RAX: 9a71b80f9d8a2200 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000006 RSI: ffffffff8dfe9eba RDI: 00000000ffffffff RBP: ffffc900036efb90 R08: ffffffff90334ef7 R09: 1ffffffff20669de R10: dffffc0000000000 R11: fffffbfff20669df R12: ffffea00045f6ac0 R13: ffffea00045f0008 R14: ffffea00045f6ac0 R15: 1ffff920006ddf54 FS: 00007fed60fc56c0(0000) GS:ffff8882a920e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3eee905440 CR3: 0000000165fdc000 CR4: 00000000000006f0 Call Trace: madvise_inject_error mm/madvise.c:1480 [inline] madvise_do_behavior+0x344/0x930 mm/madvise.c:1897 do_madvise+0x327/0x3a0 mm/madvise.c:2005 __do_sys_madvise mm/madvise.c:2014 [inline] __se_sys_madvise mm/madvise.c:2012 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2012 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fed6019ce59 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:00007fed60fc5028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fed60415fa0 RCX: 00007fed6019ce59 RDX: 0000000000000064 RSI: 0000000000001000 RDI: 0000200000ffe000 RBP: 00007fed60232e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fed60416038 R14: 00007fed60415fa0 R15: 00007ffc1c6c3eb8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:memory_failure+0x3373/0x3380 mm/memory-failure.c:2483 Code: cb 87 ff 48 89 df 48 c7 c6 e0 a2 dd 8b e8 45 79 e9 fe 90 0f 0b e8 7d cb 87 ff 4c 89 f7 48 c7 c6 40 93 dd 8b e8 2e 79 e9 fe 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900036efa00 EFLAGS: 00010246 RAX: 9a71b80f9d8a2200 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000006 RSI: ffffffff8dfe9eba RDI: 00000000ffffffff RBP: ffffc900036efb90 R08: ffffffff90334ef7 R09: 1ffffffff20669de R10: dffffc0000000000 R11: fffffbfff20669df R12: ffffea00045f6ac0 R13: ffffea00045f0008 R14: ffffea00045f6ac0 R15: 1ffff920006ddf54 FS: 00007fed60fc56c0(0000) GS:ffff8882a920e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33863fff CR3: 0000000165fdc000 CR4: 00000000000006f0 *** 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. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.