syzbot

loop0: detected capacity change from 0 to 32768
ocfs2: Slot 0 on device (7,0) was already allocated to this node!
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kernel BUG at fs/ocfs2/buffer_head_io.c:45!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5829 Comm: syz-executor154 Not tainted 6.16.0-rc2-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:ocfs2_write_block+0x5d2/0x640 fs/ocfs2/buffer_head_io.c:45
Code: 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 15 35 8b fe 49 8b 3f 4c 89 ee 48 8b 14 24 e8 16 7f 0f 00 eb 1f e8 9f e1 29 fe 90 <0f> 0b e8 97 e1 29 fe 90 0f 0b e8 8f e1 29 fe e9 ce fa ff ff e8 85
RSP: 0018:ffffc9000444ef60 EFLAGS: 00010293
RAX: ffffffff839679a1 RBX: 1ffff1100e40ec94 RCX: ffff88807fd33c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc9000444f030 R08: ffffffff8f9fe2f7 R09: 1ffffffff1f3fc5e
R10: dffffc0000000000 R11: fffffbfff1f3fc5f R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888072076488 R15: 0000000000000001
FS:  000055556e647380(0000) GS:ffff888125c85000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc2e9e4a688 CR3: 0000000073c30000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_update_disk_slot+0x6c6/0x9c0 fs/ocfs2/slot_map.c:197
 ocfs2_find_slot+0x6bb/0xc30 fs/ocfs2/slot_map.c:482
 ocfs2_mount_volume fs/ocfs2/super.c:1749 [inline]
 ocfs2_fill_super+0x3ef4/0x63d0 fs/ocfs2/super.c:1083
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1679
 vfs_get_tree+0x92/0x2b0 fs/super.c:1802
 do_new_mount+0x24a/0xa40 fs/namespace.c:3885
 do_mount fs/namespace.c:4222 [inline]
 __do_sys_mount fs/namespace.c:4433 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4410
 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: 0033:0x7f606e1bae2a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff13004f78 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff13004f90 RCX: 00007f606e1bae2a
RDX: 0000200000004440 RSI: 0000200000000240 RDI: 00007fff13004f90
RBP: 0000200000000240 R08: 00007fff13004fd0 R09: 0000000000004452
R10: 0000000000000000 R11: 0000000000000282 R12: 0000200000004440
R13: 00007fff13004fd0 R14: 0000000000000003 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_write_block+0x5d2/0x640 fs/ocfs2/buffer_head_io.c:45
Code: 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 15 35 8b fe 49 8b 3f 4c 89 ee 48 8b 14 24 e8 16 7f 0f 00 eb 1f e8 9f e1 29 fe 90 <0f> 0b e8 97 e1 29 fe 90 0f 0b e8 8f e1 29 fe e9 ce fa ff ff e8 85
RSP: 0018:ffffc9000444ef60 EFLAGS: 00010293
RAX: ffffffff839679a1 RBX: 1ffff1100e40ec94 RCX: ffff88807fd33c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc9000444f030 R08: ffffffff8f9fe2f7 R09: 1ffffffff1f3fc5e
R10: dffffc0000000000 R11: fffffbfff1f3fc5f R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888072076488 R15: 0000000000000001
FS:  000055556e647380(0000) GS:ffff888125c85000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c5524c6168 CR3: 0000000073c30000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400