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:2890!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted 6.12.0-rc4-syzkaller-00261-g850925a8133c #0
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_clear_cow_buffer+0x79/0x80 fs/ocfs2/refcounttree.c:2890
Code: 02 75 21 e8 c9 ac 02 fe 4c 89 f7 be 08 00 00 00 e8 2c 6d 6c fe 3e 41 80 26 ef 31 c0 5b 41 5e c3 cc cc cc cc e8 a8 ac 02 fe 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:ffffc9000d60ef60 EFLAGS: 00010293
RAX: ffffffff83923dc8 RBX: 0000000000000002 RCX: ffff88801f114880
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000001000 R08: ffffffff83923d9c R09: 1ffff110087e1ce8
R10: dffffc0000000000 R11: ffffed10087e1ce9 R12: ffff888043f0e740
R13: ffff888043f0e658 R14: ffff888043f0e740 R15: 0000000000000000
FS:  00007fc23f6fc6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc23f6b9f98 CR3: 000000004fd2a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 walk_page_buffers+0x104/0x1d0 fs/ocfs2/aops.c:434
 ocfs2_duplicate_clusters_by_page+0xb0a/0x1450 fs/ocfs2/refcounttree.c:2970
 ocfs2_replace_clusters fs/ocfs2/refcounttree.c:3123 [inline]
 ocfs2_make_clusters_writable fs/ocfs2/refcounttree.c:3255 [inline]
 ocfs2_replace_cow+0xd82/0x25d0 fs/ocfs2/refcounttree.c:3349
 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3427 [inline]
 ocfs2_refcount_cow+0x9c9/0x11c0 fs/ocfs2/refcounttree.c:3470
 ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2332 [inline]
 ocfs2_file_write_iter+0xf34/0x1f50 fs/ocfs2/file.c:2441
 do_iter_readv_writev+0x600/0x880
 vfs_writev+0x376/0xba0 fs/read_write.c:1064
 do_pwritev fs/read_write.c:1165 [inline]
 __do_sys_pwritev2 fs/read_write.c:1224 [inline]
 __se_sys_pwritev2+0x1ca/0x2d0 fs/read_write.c:1215
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc23e97e719
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:00007fc23f6fc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fc23eb35f80 RCX: 00007fc23e97e719
RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000004
RBP: 00007fc23e9f132e R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000007800 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc23eb35f80 R15: 00007ffdb42775a8
 </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 c9 ac 02 fe 4c 89 f7 be 08 00 00 00 e8 2c 6d 6c fe 3e 41 80 26 ef 31 c0 5b 41 5e c3 cc cc cc cc e8 a8 ac 02 fe 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:ffffc9000d60ef60 EFLAGS: 00010293
RAX: ffffffff83923dc8 RBX: 0000000000000002 RCX: ffff88801f114880
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000001000 R08: ffffffff83923d9c R09: 1ffff110087e1ce8
R10: dffffc0000000000 R11: ffffed10087e1ce9 R12: ffff888043f0e740
R13: ffff888043f0e658 R14: ffff888043f0e740 R15: 0000000000000000
FS:  00007fc23f6fc6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc23f6b9f98 CR3: 000000004fd2a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400