=======================================================
ocfs2: Slot 0 on device (7,0) was already allocated to this node!
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1443!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6001 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1443 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x1de0/0x1df0 fs/ocfs2/suballoc.c:1996
Code: e4 fb ff ff e8 d1 74 12 fe 90 0f 0b e8 c9 74 12 fe 90 0f 0b e8 c1 74 12 fe 90 0f 0b e8 b9 74 12 fe 90 0f 0b e8 b1 74 12 fe 90 <0f> 0b e8 a9 74 12 fe 90 0f 0b 66 0f 1f 44 00 00 90 90 90 90 90 90
RSP: 0018:ffffc900032f6ea0 EFLAGS: 00010293
RAX: ffffffff83ade7ff RBX: 0000000000000000 RCX: ffff88802ff19e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900032f7110 R08: ffffc900032f71a0 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff88805fd5de00
R13: dffffc0000000000 R14: ffffc900032f71a0 R15: 0000000000000000
FS:  000055557150c500(0000) GS:ffff888125d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0568d8dd30 CR3: 00000000405c8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __ocfs2_claim_clusters+0x303/0x8f0 fs/ocfs2/suballoc.c:2421
 ocfs2_local_alloc_new_window fs/ocfs2/localalloc.c:1166 [inline]
 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1295 [inline]
 ocfs2_reserve_local_alloc_bits+0x12be/0x24e0 fs/ocfs2/localalloc.c:669
 ocfs2_reserve_clusters_with_limit+0x1be/0xba0 fs/ocfs2/suballoc.c:1168
 ocfs2_mknod+0xe32/0x2050 fs/ocfs2/namei.c:357
 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:659
 vfs_mkdir+0x306/0x510 fs/namei.c:4453
 do_mkdirat+0x247/0x590 fs/namei.c:4486
 __do_sys_mkdirat fs/namei.c:4503 [inline]
 __se_sys_mkdirat fs/namei.c:4501 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4501
 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: 0033:0x7f5122d8eec9
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:00007ffc1c4ed8a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f5122fe5fa0 RCX: 00007f5122d8eec9
RDX: 0000000000000081 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f5122e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5122fe5fa0 R14: 00007f5122fe5fa0 R15: 0000000000000003
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1443 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x1de0/0x1df0 fs/ocfs2/suballoc.c:1996
Code: e4 fb ff ff e8 d1 74 12 fe 90 0f 0b e8 c9 74 12 fe 90 0f 0b e8 c1 74 12 fe 90 0f 0b e8 b9 74 12 fe 90 0f 0b e8 b1 74 12 fe 90 <0f> 0b e8 a9 74 12 fe 90 0f 0b 66 0f 1f 44 00 00 90 90 90 90 90 90
RSP: 0018:ffffc900032f6ea0 EFLAGS: 00010293
RAX: ffffffff83ade7ff RBX: 0000000000000000 RCX: ffff88802ff19e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900032f7110 R08: ffffc900032f71a0 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff88805fd5de00
R13: dffffc0000000000 R14: ffffc900032f71a0 R15: 0000000000000000
FS:  000055557150c500(0000) GS:ffff888125d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0568d8dd30 CR3: 00000000405c8000 CR4: 00000000003526f0