Re: [syzbot] [ocfs2?] kernel BUG in __ocfs2_move_extents_range

[syzbot <syzbot+f2107d999290b8166267@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in __ocfs2_move_extents_range

ocfs2: Mounting device (7,0) on (node local, slot 0) with writeback data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1363!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 5427 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : ocfs2_block_group_set_bits+0x510/0x6c4 fs/ocfs2/suballoc.c:1363
lr : ocfs2_block_group_set_bits+0x510/0x6c4 fs/ocfs2/suballoc.c:1363
sp : ffffffc0216171e0
x29: ffffffc021617260 x28: ffffffb8042c2e7c x27: ffffff80df71a740
x26: 0000000000000002 x25: ffffff80e53bc00c x24: ffffff80f209cfb8
x23: dfffffc000000000 x22: 0000000000000168 x21: 0000000000000001
x20: 1ffffff8042c2e40 x19: ffffff80e53bc000 x18: ffffffc011b0fe20
x17: 1ffffff033e18d7e x16: ffffffc0082d0900 x15: 0000000000000000
x14: 00000000fffffffc x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff00004009c64374 x10: 0000000000000000 x9 : ffffffc009c64374
x8 : ffffff80d06f5340 x7 : 0000000000000000 x6 : ffffffc008dc3fcc
x5 : 0000000000000168 x4 : 0000000000000001 x3 : ffffff80df71a740
x2 : ffffff80e53bc000 x1 : 0000000000000002 x0 : 0000000000000168
Call trace:
 ocfs2_block_group_set_bits+0x510/0x6c4 fs/ocfs2/suballoc.c:1363
 ocfs2_move_extent fs/ocfs2/move_extents.c:693 [inline]
 __ocfs2_move_extents_range+0x208c/0x2aac fs/ocfs2/move_extents.c:866
 ocfs2_move_extents+0x314/0x7e0 fs/ocfs2/move_extents.c:933
 ocfs2_ioctl_move_extents+0x420/0x5ec fs/ocfs2/move_extents.c:1065
 ocfs2_ioctl+0x204/0xaf4 fs/ocfs2/ioctl.c:930
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 17ffff5e 97a116fd d4210000 97a116fb (d4210000) 
---[ end trace 0000000000000000 ]---


Tested on:

commit:         8e6e2188 Linux 6.1.157
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15719be2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=848478f4029d639b
dashboard link: https://syzkaller.appspot.com/bug?extid=f2107d999290b8166267
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16b69be2580000