------------[ cut here ]------------
kernel BUG at fs/ocfs2/refcounttree.c:2890!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 17525 Comm: syz.3.1258 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:ocfs2_clear_cow_buffer+0x79/0x80 fs/ocfs2/refcounttree.c:2890
Code: 02 75 21 e8 79 16 03 fe 48 89 df be 08 00 00 00 e8 bc 1e 6c fe f0 80 23 ef 31 c0 5b 41 5e c3 cc cc cc cc cc e8 58 16 03 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: 0000:ffffc900051a7178 EFLAGS: 00010283
RAX: ffffffff83c1d108 RBX: ffff88805feb1000 RCX: 00000000[  757.781074][T17525] RAX: ffffffff83c1d108 RBX: ffff88805feb1000 RCX: 0000000000080000
RDX: ffffc9001984c000 RSI: 0000000000002082 RDI: 0000000000002083
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100bfd6201 R12: ffff88805feb1000
R13: ffff88805feb1120 R14: 0000000000000002 R15: 0000000000001000
FS:  00007f5b3d2496c0(0000) GS:ffff88812625d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3cff71000 CR3: 0000000036384000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 walk_page_buffers+0x94/0x1e0 fs/ocfs2/aops.c:421
 ocfs2_duplicate_clusters_by_page+0x70b/0xcd0 fs/ocfs2/refcounttree.c:2969
 __ocfs2_move_extent+0x234/0xdd0 fs/ocfs2/move_extents.c:63
 ocfs2_move_extent fs/ocfs2/move_extents.c:684 [inline]
 __ocfs2_move_extents_range fs/ocfs2/move_extents.c:870 [inline]
 ocfs2_move_extents+0x2382/0x3b90 fs/ocfs2/move_extents.c:942
 ocfs2_ioctl_move_extents+0x568/0x780 fs/ocfs2/move_extents.c:1074
 ocfs2_ioctl+0x198/0x7e0 fs/ocfs2/ioctl.c:958
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xff/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: 0033:0x7f5b3f45ce59
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:00007f5b3d249028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5b3f6d6270 RCX: 00007f5b3f45ce59
RDX: 00002000000000c0 RSI: 0000000040406f06 RDI: 0000000000000004
RBP: 00007f5b3f4f2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5b3f6d6308 R14: 00007f5b3f6d6270 R15: 00007fff2b73bc38
 </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 79 16 03 fe 48 89 df be 08 00 00 00 e8 bc 1e 6c fe f0 80 23 ef 31 c0 5b 41 5e c3 cc cc cc cc cc e8 58 16 03 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: 0000:ffffc900051a7178 EFLAGS: 00010283
RAX: ffffffff83c1d108 RBX: ffff88805feb1000 RCX: 0000000000080000
RDX: ffffc9001984c000 RSI: 0000000000002082 RDI: 0000000000002083
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100bfd6201 R12: ffff88805feb1000
R13: ffff88805feb1120 R14: 0000000000000002 R15: 0000000000001000
FS:  00007f5b3d2496c0(0000) GS:ffff88812625d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5b3f4aa540 CR3: 0000000036384000 CR4: 00000000003526f0