[syzbot] [nilfs?] WARNING in nilfs_copy_dirty_pages

[syzbot <syzbot+5aea413a54e976f31725@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    89a312991dc6 Merge tag 'cifs-fixes-7.3-rc2' of https://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11a5f349580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=5aea413a54e976f31725
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-89a31299.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/114a4744ab8e/vmlinux-89a31299.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c65021627f2c/bzImage-89a31299.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5aea413a54e976f31725@syzkaller.appspotmail.com

NILFS (loop0): mounting fs with errors
------------[ cut here ]------------
inconsistent dirty state
WARNING: fs/nilfs2/page.c:263 at nilfs_copy_dirty_pages+0x49f/0x6a0 fs/nilfs2/page.c:262, CPU#0: syz.0.0/5326
Modules linked in:
CPU: 0 UID: 0 PID: 5326 Comm: syz.0.0 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:nilfs_copy_dirty_pages+0x49f/0x6a0 fs/nilfs2/page.c:262
Code: c7 ae 60 fe 4d 8b 36 44 89 f6 83 e6 01 31 ff e8 b7 4c ef fd 41 f6 c6 01 0f 85 f1 00 00 00 e8 e8 46 ef fd 48 8d 3d 01 5c aa 0c <67> 48 0f b9 3a e9 67 ff ff ff e8 d2 46 ef fd 48 c7 c7 60 7a 31 8f
RSP: 0018:ffffc9000f4274e0 EFLAGS: 00010287
RAX: ffffffff83d88548 RBX: ffffea00010e0080 RCX: 0000000000100000
RDX: ffffc9000f689000 RSI: 00000000000003d0 RDI: ffffffff9082e150
RBP: ffffc9000f4276f8 R08: ffffea00010e0087 R09: 1ffffd400021c010
R10: dffffc0000000000 R11: fffff9400021c011 R12: dffffc0000000000
R13: ffffea00010e0088 R14: 0000000062000400 R15: 0000000000000000
FS:  00007f95373936c0(0000) GS:ffff88808c2cf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000b038 CR3: 0000000040631000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 nilfs_mdt_save_to_shadow_map+0xbb/0x1c0 fs/nilfs2/mdt.c:552
 nilfs_clean_segments+0x28d/0xbe0 fs/nilfs2/segment.c:2546
 nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:938 [inline]
 nilfs_ioctl+0x2619/0x2780 fs/nilfs2/ioctl.c:1368
 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:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f953659e159
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:00007f9537392fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9536826090 RCX: 00007f953659e159
RDX: 0000200000000040 RSI: 0000000040786e88 RDI: 0000000000000006
RBP: 00007f9536635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9536826128 R14: 00007f9536826090 R15: 00007fff3c0fc038
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	fe 4d 8b             	decb   -0x75(%rbp)
   3:	36 44 89 f6          	ss mov %r14d,%esi
   7:	83 e6 01             	and    $0x1,%esi
   a:	31 ff                	xor    %edi,%edi
   c:	e8 b7 4c ef fd       	call   0xfdef4cc8
  11:	41 f6 c6 01          	test   $0x1,%r14b
  15:	0f 85 f1 00 00 00    	jne    0x10c
  1b:	e8 e8 46 ef fd       	call   0xfdef4708
  20:	48 8d 3d 01 5c aa 0c 	lea    0xcaa5c01(%rip),%rdi        # 0xcaa5c28
* 27:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2c:	e9 67 ff ff ff       	jmp    0xffffff98
  31:	e8 d2 46 ef fd       	call   0xfdef4708
  36:	48 c7 c7 60 7a 31 8f 	mov    $0xffffffff8f317a60,%rdi


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