[syzbot] [nilfs?] BUG: corrupted list in nilfs_lookup_dirty_data_buffers

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f31c00c377cc Merge tag 'platform-drivers-x86-v7.2-1' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10f687f2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=31a51e0acb798311
dashboard link: https://syzkaller.appspot.com/bug?extid=c37bed40868932d790e9
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10376ba1580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c42341580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f31c00c3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/65376d2aeca1/vmlinux-f31c00c3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dba2c41e8c30/bzImage-f31c00c3.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/12e3220d6326/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c37bed...@syzkaller.appspotmail.com

list_add double add: new=ffff888043d25c80, prev=ffff888043d25c80, next=ffffc900034ff1c0.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:37!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5513 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__list_add_valid_or_report+0xa5/0x130 lib/list_debug.c:35
Code: 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 c7 c7 60 9f 2a 8c 4c 89 fe 4c 89 f2 48 89 d9 e8 7c 57 63 fc 90 <0f> 0b 48 c7 c7 40 9d 2a 8c e8 6d 57 63 fc 90 0f 0b 48 c7 c7 00 9e
RSP: 0018:ffffc900034fed48 EFLAGS: 00010246
RAX: 0000000000000058 RBX: ffffc900034ff1c0 RCX: 74a71100abd37800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff9200069fe39 R08: ffff88801fc24713 R09: 1ffff11003f848e2
R10: dffffc0000000000 R11: ffffed1003f848e3 R12: 1ffff110087a4b90
R13: dffffc0000000000 R14: ffff888043d25c80 R15: ffff888043d25c80
FS: 00005555919bc500(0000) GS:ffff88808c821000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4434df8eb8 CR3: 000000001ab95000 CR4: 0000000000352ef0
Call Trace:
<TASK>
__list_add_valid include/linux/list.h:96 [inline]
__list_add include/linux/list.h:158 [inline]
list_add_tail include/linux/list.h:191 [inline]
nilfs_lookup_dirty_data_buffers+0x468/0x7b0 fs/nilfs2/segment.c:745
nilfs_segctor_scan_file+0x26a/0xf70 fs/nilfs2/segment.c:1046
nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1198 [inline]
nilfs_segctor_collect fs/nilfs2/segment.c:1547 [inline]
nilfs_segctor_do_construct+0x1c8d/0x7bb0 fs/nilfs2/segment.c:2122
nilfs_segctor_construct+0x170/0x690 fs/nilfs2/segment.c:2462
nilfs_clean_segments+0x4ec/0xbb0 fs/nilfs2/segment.c:2557
nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:922 [inline]
nilfs_ioctl+0x2619/0x2780 fs/nilfs2/ioctl.c:1352
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
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: 0033:0x7f620d99ce59
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:00007fffb7f16fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f620dc15fa0 RCX: 00007f620d99ce59
RDX: 0000200000000040 RSI: 0000000040786e88 RDI: 0000000000000004
RBP: 00007f620da32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f620dc15fac R14: 00007f620dc15fa0 R15: 00007f620dc15fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xa5/0x130 lib/list_debug.c:35
Code: 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 c7 c7 60 9f 2a 8c 4c 89 fe 4c 89 f2 48 89 d9 e8 7c 57 63 fc 90 <0f> 0b 48 c7 c7 40 9d 2a 8c e8 6d 57 63 fc 90 0f 0b 48 c7 c7 00 9e
RSP: 0018:ffffc900034fed48 EFLAGS: 00010246
RAX: 0000000000000058 RBX: ffffc900034ff1c0 RCX: 74a71100abd37800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff9200069fe39 R08: ffff88801fc24713 R09: 1ffff11003f848e2
R10: dffffc0000000000 R11: ffffed1003f848e3 R12: 1ffff110087a4b90
R13: dffffc0000000000 R14: ffff888043d25c80 R15: ffff888043d25c80
FS: 00005555919bc500(0000) GS:ffff88808c821000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe0c8f2f440 CR3: 000000001ab95000 CR4: 0000000000352ef0


---
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[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
lost connection to test machine



Tested on:

commit: ab9de95c Merge tag 'rust-7.2-2' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1258540a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3c3d59be33cf7e9a

dashboard link: https://syzkaller.appspot.com/bug?extid=c37bed40868932d790e9
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

patch: https://syzkaller.appspot.com/x/patch.diff?x=145ba7a1580000