Message-ID: <67a4eae3.050a0220.65602.0001.GAE@google.com>
Date: Thu, 06 Feb 2025 09:01:23 -0800
From: syzbot <syzbot+6663075ddb9be85fa6e5@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, kent.overstreet@...ux.dev, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [mm?] [bcachefs?] KASAN: slab-use-after-free Read in list_lru_del

Hello,

syzbot found the following issue on:

HEAD commit:    92514ef226f5 Merge tag 'for-6.14-rc1-tag' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=126aa4a4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1909f2f0d8e641ce
dashboard link: https://syzkaller.appspot.com/bug?extid=6663075ddb9be85fa6e5
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14926df8580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-92514ef2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c4d8b91f8769/vmlinux-92514ef2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c24ec4365966/bzImage-92514ef2.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/efb05b29bf18/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6663075ddb9be85fa6e5@...kaller.appspotmail.com

 slab radix_tree_node start ffff8880411d9600 pointer offset 24 size 576
list_del corruption. next->prev should be ffff88803f847358, but was 0000000008000105. (next=ffff8880411d9618)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:67!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5628 Comm: modprobe Not tainted 6.14.0-rc1-syzkaller-00034-g92514ef226f5 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__list_del_entry_valid_or_report+0x18c/0x190 lib/list_debug.c:65
Code: ba 56 15 fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 7b 02 37 fd 49 8b 56 08 48 c7 c7 20 8f 60 8c 4c 89 fe 4c 89 f1 e8 65 10 38 fc 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f
RSP: 0018:ffffc9000cdced10 EFLAGS: 00010046
RAX: 000000000000006d RBX: 1ffff1100823b2c4 RCX: a96f20814868f300
RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000
RBP: ffff888032fbde80 R08: ffffffff819f146c R09: fffffbfff1cfa588
R10: dffffc0000000000 R11: fffffbfff1cfa588 R12: ffff8880411d9620
R13: dffffc0000000000 R14: ffff8880411d9618 R15: ffff88803f847358
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff0ee1cb270 CR3: 0000000000712000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_del_init include/linux/list.h:287 [inline]
 list_lru_del+0x9a/0x1f0 mm/list_lru.c:206
 list_lru_del_obj+0x17b/0x250 mm/list_lru.c:223
 workingset_update_node+0x174/0x230 mm/workingset.c:636
 xas_update lib/xarray.c:356 [inline]
 update_node lib/xarray.c:764 [inline]
 xas_store+0xb89/0x1870 lib/xarray.c:851
 __filemap_add_folio+0xab1/0x1320 mm/filemap.c:925
 filemap_add_folio+0x155/0x380 mm/filemap.c:981
 __filemap_get_folio+0x52b/0xae0 mm/filemap.c:1980
 grow_dev_folio fs/buffer.c:1039 [inline]
 grow_buffers fs/buffer.c:1105 [inline]
 __getblk_slow fs/buffer.c:1131 [inline]
 bdev_getblk+0x1d4/0x670 fs/buffer.c:1431
 getblk_unmovable include/linux/buffer_head.h:369 [inline]
 ext4_getblk+0x31b/0x880 fs/ext4/inode.c:864
 ext4_bread_batch+0x63/0x4e0 fs/ext4/inode.c:933
 __ext4_find_entry+0xfab/0x1eb0 fs/ext4/namei.c:1627
 ext4_lookup_entry fs/ext4/namei.c:1729 [inline]
 ext4_lookup+0x15f/0x750 fs/ext4/namei.c:1797
 __lookup_slow+0x296/0x400 fs/namei.c:1793
 lookup_slow+0x53/0x70 fs/namei.c:1810
 walk_component fs/namei.c:2114 [inline]
 link_path_walk+0x99b/0xea0 fs/namei.c:2479
 path_openat+0x266/0x3590 fs/namei.c:3985
 do_filp_open+0x27f/0x4e0 fs/namei.c:4016
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1453
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff0ee472a46
Code: 10 00 00 00 44 8b 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 0a 48 01 00 48 83 c8 ff c3 31
RSP: 002b:00007ffdd50a1c28 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffdd50a1e88 RCX: 00007ff0ee472a46
RDX: 0000000000080000 RSI: 00007ffdd50a1ca0 RDI: 00000000ffffff9c
RBP: 00007ffdd50a1c90 R08: 0000000000080000 R09: 00007ffdd50a1ca0
R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffdd50a1ca0
R13: 0000000000000000 R14: 00007ffdd50a1e6f R15: 00000000ffffffff
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x18c/0x190 lib/list_debug.c:65
Code: ba 56 15 fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 7b 02 37 fd 49 8b 56 08 48 c7 c7 20 8f 60 8c 4c 89 fe 4c 89 f1 e8 65 10 38 fc 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f
RSP: 0018:ffffc9000cdced10 EFLAGS: 00010046
RAX: 000000000000006d RBX: 1ffff1100823b2c4 RCX: a96f20814868f300
RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000
RBP: ffff888032fbde80 R08: ffffffff819f146c R09: fffffbfff1cfa588
R10: dffffc0000000000 R11: fffffbfff1cfa588 R12: ffff8880411d9620
R13: dffffc0000000000 R14: ffff8880411d9618 R15: ffff88803f847358
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff0ee1cb270 CR3: 0000000000712000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Powered by blists - more mailing lists