loop4: detected capacity change from 0 to 32768
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6723 at fs/bcachefs/super.c:1262 bch2_dev_free+0x228/0x290 fs/bcachefs/super.c:1262
Modules linked in:
CPU: 0 UID: 0 PID: 6723 Comm: syz.4.172 Not tainted 6.15.0-rc1-next-20250411-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:1262
Code: ff e8 2c e3 74 00 4c 89 ef e8 24 e3 74 00 48 89 df 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 be e9 97 07 e8 39 9c 32 fd 90 <0f> 0b 90 e9 09 fe ff ff e8 2b 9c 32 fd 90 0f 0b 90 e9 15 fe ff ff
RSP: 0018:ffffc9000431f160 EFLAGS: 00010283
RAX: ffffffff8490de07 RBX: ffff88805939a000 RCX: 0000000000080000
RDX: ffffc9000cc72000 RSI: 000000000001c815 RDI: 000000000001c816
RBP: ffff88805939a0c0 R08: ffffffff8505d107 R09: 0000000000000000
R10: ffffc9000431efe0 R11: fffff52000863e01 R12: dffffc0000000000
R13: ffff88805939a0b0 R14: ffff88805939a000 R15: 0000000000000100
FS:  00007fa118fc76c0(0000) GS:ffff888124f80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f791077aef8 CR3: 00000000309f2000 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:1431
 bch2_dev_alloc+0xd6/0x180 fs/bcachefs/super.c:1457
 bch2_fs_alloc fs/bcachefs/super.c:999 [inline]
 bch2_fs_open+0x2fa8/0x30d0 fs/bcachefs/super.c:2248
 bch2_fs_get_tree+0x775/0x18e0 fs/bcachefs/fs.c:2172
 vfs_get_tree+0x90/0x2b0 fs/super.c:1809
 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: 0033:0x7fa11818e90a
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:00007fa118fc6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa118fc6ef0 RCX: 00007fa11818e90a
RDX: 0000200000000000 RSI: 0000200000000080 RDI: 00007fa118fc6eb0
RBP: 0000200000000000 R08: 00007fa118fc6ef0 R09: 0000000000004010
R10: 0000000000004010 R11: 0000000000000246 R12: 0000200000000080
R13: 00007fa118fc6eb0 R14: 0000000000005adc R15: 00002000000000c0
 </TASK>