------------[ cut here ]------------
WARNING: CPU: 1 PID: 6660 at fs/bcachefs/super.c:1219 bch2_dev_free+0x228/0x290 fs/bcachefs/super.c:1219
Modules linked in:
CPU: 1 UID: 0 PID: 6660 Comm: syz.2.143 Not tainted 6.15.0-rc2-syzkaller #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:1219
Code: ff e8 1c 4e 74 00 4c 89 ef e8 14 4e 74 00 48 89 df 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 8e 7f 96 07 e8 09 6e 33 fd 90 <0f> 0b 90 e9 09 fe ff ff e8 fb 6d 33 fd 90 0f 0b 90 e9 15 fe ff ff
RSP: 0018:ffffc900036df120 EFLAGS: 00010287
RAX: ffffffff848fe727 RBX: ffff888029af4000 RCX: 0000000000080000
RDX: ffffc9000c12b000 RSI: 000000000002ba87 RDI: 000000000002ba88
RBP: ffff888029af40c0 R08: ffffffff85044517 R09: ffffc900036defa0
R10: dffffc0000000000 R11: fffff520006dbdf9 R12: dffffc0000000000
R13: ffff888029af40b0 R14: ffff888029af4000 R15: 0000000000000100
FS:  00007fd35d4c86c0(0000) GS:ffff888125093000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000b9000 CR3: 00000000446ca000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __bch2_dev_alloc+0x7dc/0xaf0 fs/bcachefs/super.c:1388
 bch2_dev_alloc+0xd6/0x180 fs/bcachefs/super.c:1414
 bch2_fs_alloc fs/bcachefs/super.c:965 [inline]
 bch2_fs_open+0x3167/0x32a0 fs/bcachefs/super.c:2209
 bch2_fs_get_tree+0x77b/0x18f0 fs/bcachefs/fs.c:2172
 vfs_get_tree+0x92/0x2b0 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: 0033:0x7fd35c58e90a
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:00007fd35d4c7e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd35d4c7ef0 RCX: 00007fd35c58e90a
RDX: 00002000000000c0 RSI: 0000200000000000 RDI: 00007fd35d4c7eb0
RBP: 00002000000000c0 R08: 00007fd35d4c7ef0 R09: 0000000000800080
R10: 0000000000800080 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fd35d4c7eb0 R14: 000000000000594d R15: 00002000000003c0
 </TASK>