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:2890!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5329 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:2890
Code: 02 75 21 e8 a9 1e fb fd 48 89 df be 08 00 00 00 e8 4c 05 68 fe 3e 80 23 ef 31 c0 5b 41 5e c3 cc cc cc cc cc e8 88 1e fb 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:ffffc9000757f178 EFLAGS: 00010293
RAX: ffffffff83caa8b8 RBX: ffff8880472e0000 RCX: ffff88801fa3ca80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff8880472e0007 R09: 1ffff11008e5c000
R10: dffffc0000000000 R11: ffffed1008e5c001 R12: ffff8880472e0000
R13: ffff8880472e00e8 R14: 0000000000000002 R15: 0000000000001000
FS:  00007f55b86666c0(0000) GS:ffff88808c894000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000017c0 CR3: 00000000122d6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 walk_page_buffers+0x94/0x1e0 fs/ocfs2/aops.c:421
 ocfs2_duplicate_clusters_by_page+0x713/0xce0 fs/ocfs2/refcounttree.c:2969
 __ocfs2_move_extent+0x234/0xdd0 fs/ocfs2/move_extents.c:63
 ocfs2_defrag_extent fs/ocfs2/move_extents.c:311 [inline]
 __ocfs2_move_extents_range fs/ocfs2/move_extents.c:867 [inline]
 ocfs2_move_extents+0x2281/0x3b10 fs/ocfs2/move_extents.c:942
 ocfs2_ioctl_move_extents+0x5bb/0x760 fs/ocfs2/move_extents.c:1074
 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: 0033:0x7f55b779ce59
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:00007f55b8665fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f55b7a16090 RCX: 00007f55b779ce59
RDX: 00002000000000c0 RSI: 0000000040406f06 RDI: 0000000000000008
RBP: 00007f55b7832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f55b7a16128 R14: 00007f55b7a16090 R15: 00007fff8c9790d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_clear_cow_buffer+0x79/0x80 fs/ocfs2/refcounttree.c:2890
Code: 02 75 21 e8 a9 1e fb fd 48 89 df be 08 00 00 00 e8 4c 05 68 fe 3e 80 23 ef 31 c0 5b 41 5e c3 cc cc cc cc cc e8 88 1e fb 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:ffffc9000757f178 EFLAGS: 00010293
RAX: ffffffff83caa8b8 RBX: ffff8880472e0000 RCX: ffff88801fa3ca80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff8880472e0007 R09: 1ffff11008e5c000
R10: dffffc0000000000 R11: ffffed1008e5c001 R12: ffff8880472e0000
R13: ffff8880472e00e8 R14: 0000000000000002 R15: 0000000000001000
FS:  00007f55b86666c0(0000) GS:ffff88808c894000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000017c0 CR3: 00000000122d6000 CR4: 0000000000352ef0