------------[ cut here ]------------
WARNING: CPU: 0 PID: 7381 at fs/bcachefs/super.c:1229 bch2_dev_free+0x228/0x290 fs/bcachefs/super.c:1229
Modules linked in:
CPU: 0 UID: 0 PID: 7381 Comm: syz.8.147 Not tainted 6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:bch2_dev_free+0x228/0x290 fs/bcachefs/super.c:1229
Code: ff e8 6c f8 6e 00 4c 89 ef e8 64 f8 6e 00 48 89 df 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 7e fe 90 07 e8 79 0c 36 fd 90 <0f> 0b 90 e9 09 fe ff ff e8 6b 0c 36 fd 90 0f 0b 90 e9 15 fe ff ff
RSP: 0018:ffffc90002fb7120 EFLAGS: 00010287
RAX: ffffffff848d4837 RBX: ffff888051fbe000 RCX: 0000000000080000
RDX: ffffc9000ccec000 RSI: 0000000000027cce RDI: 0000000000027ccf
RBP: ffff888051fbe0c0 R08: ffffffff84fc5077 R09: 0000000000000000
R10: ffffc90002fb6fa0 R11: fffff520005f6df9 R12: dffffc0000000000
R13: ffff888051fbe0b0 R14: ffff888051fbe000 R15: 0000000000000100
FS:  00007f3d94e946c0(0000) GS:ffff888124fc9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555580c73808 CR3: 000000007bd38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __bch2_dev_alloc+0x7dc/0xaf0 fs/bcachefs/super.c:1398
 bch2_dev_alloc+0xd6/0x180 fs/bcachefs/super.c:1424
 bch2_fs_alloc fs/bcachefs/super.c:969 [inline]
 bch2_fs_open+0x3167/0x32a0 fs/bcachefs/super.c:2219
 bch2_fs_get_tree+0x77b/0x18f0 fs/bcachefs/fs.c:2172
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3879
 do_mount fs/namespace.c:4219 [inline]
 __do_sys_mount fs/namespace.c:4430 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4407
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d93f8e90a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3d94e93e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3d94e93ef0 RCX: 00007f3d93f8e90a
RDX: 00002000000000c0 RSI: 0000200000000180 RDI: 00007f3d94e93eb0
RBP: 00002000000000c0 R08: 00007f3d94e93ef0 R09: 0000000002210810
R10: 0000000002210810 R11: 0000000000000246 R12: 0000200000000180
R13: 00007f3d94e93eb0 R14: 0000000000005a21 R15: 0000200000000100
 </TASK>