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.
=======================================================
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
netlink: 12 bytes leftover after parsing attributes in process `syz.0.0'.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/refcounttree.c:2678!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5321 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~bpo12+1 04/01/2014
RIP: 0010:ocfs2_refcount_cal_cow_clusters+0x12a1/0x12b0 fs/ocfs2/refcounttree.c:2678
Code: 13 8d 8d ba 69 0a 00 00 48 c7 c1 20 69 ab 8b 4c 8b 4c 24 30 e8 d0 4f 10 00 90 0f 0b e8 38 0b 15 fe 90 0f 0b e8 30 0b 15 fe 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d5675e0 EFLAGS: 00010283
RAX: ffffffff83ab0860 RBX: 1ffff110016ada9a RCX: 0000000000100000
RDX: ffffc9000de6a000 RSI: 00000000000000f0 RDI: 00000000000000f1
RBP: ffffc9000d5677a8 R08: 00000000ffffffff R09: ffffc9000d56785c
R10: 00000000fffffffc R11: 0000000000000002 R12: 0000000000000000
R13: 1ffff110016ada9a R14: ffff88800b56d4d0 R15: 0000000000000000
FS:  00007fbe7d1aa6c0(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000009a40 CR3: 0000000011fcb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3385 [inline]
 ocfs2_refcount_cow+0x31f/0xc90 fs/ocfs2/refcounttree.c:3467
 ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2340 [inline]
 ocfs2_file_write_iter+0xe28/0x1d10 fs/ocfs2/file.c:2451
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe7c38efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbe7d1aa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbe7c5e5fa0 RCX: 00007fbe7c38efc9
RDX: 0000000000000105 RSI: 00002000000003c0 RDI: 0000000000000006
RBP: 00007fbe7c411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbe7c5e6038 R14: 00007fbe7c5e5fa0 R15: 00007ffd83a8a4d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_refcount_cal_cow_clusters+0x12a1/0x12b0 fs/ocfs2/refcounttree.c:2678
Code: 13 8d 8d ba 69 0a 00 00 48 c7 c1 20 69 ab 8b 4c 8b 4c 24 30 e8 d0 4f 10 00 90 0f 0b e8 38 0b 15 fe 90 0f 0b e8 30 0b 15 fe 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d5675e0 EFLAGS: 00010283
RAX: ffffffff83ab0860 RBX: 1ffff110016ada9a RCX: 0000000000100000
RDX: ffffc9000de6a000 RSI: 00000000000000f0 RDI: 00000000000000f1
RBP: ffffc9000d5677a8 R08: 00000000ffffffff R09: ffffc9000d56785c
R10: 00000000fffffffc R11: 0000000000000002 R12: 0000000000000000
R13: 1ffff110016ada9a R14: ffff88800b56d4d0 R15: 0000000000000000
FS:  00007fbe7d1aa6c0(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe7c3ec470 CR3: 0000000011fcb000 CR4: 0000000000352ef0