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:2922!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5319 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:2922
Code: 02 75 21 e8 39 88 d4 fd 48 89 df be 08 00 00 00 e8 8c 2d 46 fe f0 80 23 ef 31 c0 5b 41 5e c3 cc cc cc cc cc e8 18 88 d4 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:ffffc9000e1b7058 EFLAGS: 00010283
RAX: ffffffff83f364f8 RBX: ffff888043e85b60 RCX: 0000000000100000
RDX: ffffc9000e9ea000 RSI: 000000000000046d RDI: 000000000000046e
RBP: 0000000000000001 R08: ffff888043e85b67 R09: 1ffff110087d0b6c
R10: dffffc0000000000 R11: ffffed10087d0b6d R12: ffff888043e85b60
R13: ffff888043e85c40 R14: 0000000000000002 R15: 0000000000001000
FS:  00007f452711d6c0(0000) GS:ffff88808c2bf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f451b3bd000 CR3: 00000000121bc000 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:3001
 ocfs2_replace_clusters fs/ocfs2/refcounttree.c:3152 [inline]
 ocfs2_make_clusters_writable fs/ocfs2/refcounttree.c:3284 [inline]
 ocfs2_replace_cow+0xaf4/0x1ca0 fs/ocfs2/refcounttree.c:3378
 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3455 [inline]
 ocfs2_refcount_cow+0x790/0xd40 fs/ocfs2/refcounttree.c:3498
 ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2352 [inline]
 ocfs2_file_write_iter+0xf26/0x1f10 fs/ocfs2/file.c:2463
 do_iter_readv_writev+0x612/0x8c0 fs/read_write.c:-1
 vfs_writev+0x343/0x990 fs/read_write.c:1058
 do_pwritev fs/read_write.c:1154 [inline]
 __do_sys_pwritev2 fs/read_write.c:1212 [inline]
 __se_sys_pwritev2+0x177/0x2a0 fs/read_write.c:1203
 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: 0033:0x7f452619e159
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:00007f452711cfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f4526425fa0 RCX: 00007f452619e159
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000009
RBP: 00007f452623506b R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000007000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4526426038 R14: 00007f4526425fa0 R15: 00007ffea42b6218
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_clear_cow_buffer+0x79/0x80 fs/ocfs2/refcounttree.c:2922
Code: 02 75 21 e8 39 88 d4 fd 48 89 df be 08 00 00 00 e8 8c 2d 46 fe f0 80 23 ef 31 c0 5b 41 5e c3 cc cc cc cc cc e8 18 88 d4 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:ffffc9000e1b7058 EFLAGS: 00010283
RAX: ffffffff83f364f8 RBX: ffff888043e85b60 RCX: 0000000000100000
RDX: ffffc9000e9ea000 RSI: 000000000000046d RDI: 000000000000046e
RBP: 0000000000000001 R08: ffff888043e85b67 R09: 1ffff110087d0b6c
R10: dffffc0000000000 R11: ffffed10087d0b6d R12: ffff888043e85b60
R13: ffff888043e85c40 R14: 0000000000000002 R15: 0000000000001000
FS:  00007f452711d6c0(0000) GS:ffff88808c2bf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f451b3bd000 CR3: 00000000121bc000 CR4: 0000000000352ef0