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.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/refcounttree.c:2678!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5330 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: ea 6c 8d ba 69 0a 00 00 48 c7 c1 60 3f 8b 8b 4c 8b 4c 24 30 e8 d0 4f 10 00 90 0f 0b e8 08 92 16 fe 90 0f 0b e8 00 92 16 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:ffffc9000d41f440 EFLAGS: 00010283
RAX: ffffffff83a7fc40 RBX: 1ffff1100a54e89a RCX: 0000000000100000
RDX: ffffc9000e10a000 RSI: 000000000000010a RDI: 000000000000010b
RBP: ffffc9000d41f608 R08: 00000000ffffffff R09: ffffc9000d41f6bc
R10: 00000000fffffffc R11: 0000000000000002 R12: 0000000000000000
R13: 1ffff1100a54e89a R14: ffff888052a744d0 R15: 0000000000000000
FS:  00007f17222ac6c0(0000) GS:ffff88808d98a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 00000000420b4000 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
 do_iter_readv_writev+0x623/0x8c0 fs/read_write.c:-1
 vfs_writev+0x31a/0x960 fs/read_write.c:1057
 do_writev+0x14d/0x2d0 fs/read_write.c:1103
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f172138eec9
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:00007f17222ac038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f17215e5fa0 RCX: 00007f172138eec9
RDX: 0000000000000008 RSI: 00002000000005c0 RDI: 0000000000000007
RBP: 00007f1721411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f17215e6038 R14: 00007f17215e5fa0 R15: 00007ffc56dd86a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_refcount_cal_cow_clusters+0x12a1/0x12b0 fs/ocfs2/refcounttree.c:2678
Code: ea 6c 8d ba 69 0a 00 00 48 c7 c1 60 3f 8b 8b 4c 8b 4c 24 30 e8 d0 4f 10 00 90 0f 0b e8 08 92 16 fe 90 0f 0b e8 00 92 16 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:ffffc9000d41f440 EFLAGS: 00010283
RAX: ffffffff83a7fc40 RBX: 1ffff1100a54e89a RCX: 0000000000100000
RDX: ffffc9000e10a000 RSI: 000000000000010a RDI: 000000000000010b
RBP: ffffc9000d41f608 R08: 00000000ffffffff R09: ffffc9000d41f6bc
R10: 00000000fffffffc R11: 0000000000000002 R12: 0000000000000000
R13: 1ffff1100a54e89a R14: ffff888052a744d0 R15: 0000000000000000
FS:  00007f17222ac6c0(0000) GS:ffff88808d98a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 00000000420b4000 CR4: 0000000000352ef0