[v6.6] kernel BUG in __ocfs2_move_extents_range

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 1b4ef5214f17 Linux 6.6.124
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12d9115a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2a950bf7c0bff9f9
dashboard link: https://syzkaller.appspot.com/bug?extid=407b478975975272f266
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/054222c95938/disk-1b4ef521.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bf3f638dea81/vmlinux-1b4ef521.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ba2200fbe5c9/bzImage-1b4ef521.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+407b47...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1349!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6204 Comm: syz.2.67 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:ocfs2_block_group_set_bits+0x57e/0x6b0 fs/ocfs2/suballoc.c:1349
Code: ff 44 89 e1 80 e1 07 fe c1 38 c1 0f 8c 4c fd ff ff 4c 89 e7 e8 73 fe 7d fe e9 3f fd ff ff e8 99 d5 25 fe 0f 0b e8 92 d5 25 fe <0f> 0b 65 44 8b 25 b4 77 a2 7c bf 07 00 00 00 44 89 e6 e8 2b d9 25
RSP: 0018:ffffc9000be173c0 EFLAGS: 00010246
RAX: ffffffff83613e0e RBX: 000000000000007f RCX: 0000000000080000
RDX: ffffc9000daab000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000be174b0 R08: 0000000000000007 R09: 000000000000007f
R10: 00000000fffffffc R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000007 R14: ffff8880611f2000 R15: 0000000000000001
FS: 00007f7652e2b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd98b08a6b0 CR3: 0000000073f26000 CR4: 00000000003506f0
Call Trace:
<TASK>
ocfs2_move_extent fs/ocfs2/move_extents.c:693 [inline]
__ocfs2_move_extents_range+0x2a13/0x35d0 fs/ocfs2/move_extents.c:866
ocfs2_move_extents+0x3a7/0x9a0 fs/ocfs2/move_extents.c:938
ocfs2_ioctl_move_extents+0x527/0x6c0 fs/ocfs2/move_extents.c:1064
ocfs2_ioctl+0x199/0x7e0 fs/ocfs2/ioctl.c:945
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7651f9bf79
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:00007f7652e2b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7652215fa0 RCX: 00007f7651f9bf79
RDX: 00002000000000c0 RSI: 0000000040406f06 RDI: 0000000000000005
RBP: 00007f76520327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7652216038 R14: 00007f7652215fa0 R15: 00007ffcb610d0c8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_block_group_set_bits+0x57e/0x6b0 fs/ocfs2/suballoc.c:1349
Code: ff 44 89 e1 80 e1 07 fe c1 38 c1 0f 8c 4c fd ff ff 4c 89 e7 e8 73 fe 7d fe e9 3f fd ff ff e8 99 d5 25 fe 0f 0b e8 92 d5 25 fe <0f> 0b 65 44 8b 25 b4 77 a2 7c bf 07 00 00 00 44 89 e6 e8 2b d9 25
RSP: 0018:ffffc9000be173c0 EFLAGS: 00010246
RAX: ffffffff83613e0e RBX: 000000000000007f RCX: 0000000000080000
RDX: ffffc9000daab000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000be174b0 R08: 0000000000000007 R09: 000000000000007f
R10: 00000000fffffffc R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000007 R14: ffff8880611f2000 R15: 0000000000000001
FS: 00007f7652e2b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01c844e661 CR3: 0000000073f26000 CR4: 00000000003506f0


---
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 syzk...@googlegroups.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 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