loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/refcounttree.c:2895!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5328 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:ocfs2_clear_cow_buffer+0x79/0x80 fs/ocfs2/refcounttree.c:2895
Code: 02 75 21 e8 b9 02 dc fd 48 89 df be 08 00 00 00 e8 0c 2a 4b fe 3e 80 23 ef 31 c0 5b 41 5e c3 cc cc cc cc cc e8 98 02 dc fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000e66f178 EFLAGS: 00010283
RAX: ffffffff83ea7f38 RBX: ffff88800bd9c700 RCX: 0000000000100000
RDX: ffffc9000ef82000 RSI: 0000000000001107 RDI: 0000000000001108
RBP: 0000000000000001 R08: ffff88800bd9c707 R09: 1ffff110017b38e0
R10: dffffc0000000000 R11: ffffed10017b38e1 R12: ffff88800bd9c700
R13: ffff88800bd9c7e0 R14: 0000000000000002 R15: 0000000000001000
FS:  00007fc8b5cd06c0(0000) GS:ffff88808c54a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc8b4f78ba0 CR3: 0000000012947000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 walk_page_buffers+0x94/0x1e0 fs/ocfs2/aops.c:421
 ocfs2_duplicate_clusters_by_page+0x70b/0xcd0 fs/ocfs2/refcounttree.c:2974
 __ocfs2_move_extent+0x234/0xdd0 fs/ocfs2/move_extents.c:63
 ocfs2_move_extent fs/ocfs2/move_extents.c:686 [inline]
 __ocfs2_move_extents_range fs/ocfs2/move_extents.c:872 [inline]
 ocfs2_move_extents+0x2382/0x3b90 fs/ocfs2/move_extents.c:944
 ocfs2_ioctl_move_extents+0x562/0x770 fs/ocfs2/move_extents.c:1076
 ocfs2_ioctl+0x195/0x7e0 fs/ocfs2/ioctl.c:958
 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: 0033:0x7fc8b4d9de59
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:00007fc8b5ccffe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc8b5025fa0 RCX: 00007fc8b4d9de59
RDX: 00002000000000c0 RSI: 0000000040406f06 RDI: 0000000000000005
RBP: 00007fc8b4e33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc8b5026038 R14: 00007fc8b5025fa0 R15: 00007ffe78b2c028
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_clear_cow_buffer+0x79/0x80 fs/ocfs2/refcounttree.c:2895
Code: 02 75 21 e8 b9 02 dc fd 48 89 df be 08 00 00 00 e8 0c 2a 4b fe 3e 80 23 ef 31 c0 5b 41 5e c3 cc cc cc cc cc e8 98 02 dc fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000e66f178 EFLAGS: 00010283
RAX: ffffffff83ea7f38 RBX: ffff88800bd9c700 RCX: 0000000000100000
RDX: ffffc9000ef82000 RSI: 0000000000001107 RDI: 0000000000001108
RBP: 0000000000000001 R08: ffff88800bd9c707 R09: 1ffff110017b38e0
R10: dffffc0000000000 R11: ffffed10017b38e1 R12: ffff88800bd9c700
R13: ffff88800bd9c7e0 R14: 0000000000000002 R15: 0000000000001000
FS:  00007fc8b5cd06c0(0000) GS:ffff88808c54a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f121160f2c0 CR3: 0000000012947000 CR4: 0000000000352ef0