From: syzbot ci <syzbot+cidba0dde345b6f18b@syzkaller.appspotmail.com>
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
Subject: [syzbot ci] Re: mm: fix inode UAF when splitting a file folio past EOF
Date: Tue, 14 Jul 2026 22:55:28 -0700 [thread overview]
Message-ID: <6a5720d0.c90005c7.37d349.0043.GAE@google.com> (raw)
In-Reply-To: <20260714122344.351895-1-kirill@shutemov.name>
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:
<TASK>
__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
</TASK>
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:
<TASK>
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
</TASK>
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:
<TASK>
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
</TASK>
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.
prev parent reply other threads:[~2026-07-15 5:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-14 12:23 [PATCH v2 0/5] " Kiryl Shutsemau
2026-07-14 12:23 ` [PATCH v2 1/5] mm/memory-failure: keep the folio, not the poisoned subpage, locked across split Kiryl Shutsemau
2026-07-14 13:01 ` David Hildenbrand (Arm)
2026-07-14 14:53 ` Kiryl Shutsemau
2026-07-14 14:58 ` David Hildenbrand (Arm)
2026-07-14 15:44 ` Zi Yan
2026-07-14 16:40 ` Kiryl Shutsemau
2026-07-14 17:31 ` Zi Yan
2026-07-15 10:42 ` Kiryl Shutsemau
2026-07-15 13:01 ` David Hildenbrand (Arm)
2026-07-15 13:27 ` Zi Yan
2026-07-16 1:24 ` Baolin Wang
2026-07-14 13:05 ` Kiryl Shutsemau
2026-07-14 12:23 ` [PATCH v2 2/5] mm/huge_memory: refuse to split a file folio when the anchor is beyond EOF Kiryl Shutsemau
2026-07-14 12:23 ` [PATCH v2 3/5] mm/huge_memory: remove unused split_huge_page_to_order() Kiryl Shutsemau
2026-07-14 12:23 ` [PATCH v2 4/5] mm/huge_memory: remove unused can_split_folio() Kiryl Shutsemau
2026-07-14 12:23 ` [PATCH v2 5/5] mm/huge_memory: fold split_folio_to_list_to_order() into split_folio_to_order() Kiryl Shutsemau
2026-07-15 5:55 ` syzbot ci [this message]
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