BTRFS info (device loop7): at unmount dio bytes count 65536
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WARNING: CPU: 1 PID: 6534 at fs/btrfs/block-group.c:159 btrfs_put_block_group+0x2fb/0x350 fs/btrfs/block-group.c:159
Modules linked in:
CPU: 1 UID: 0 PID: 6534 Comm: syz-executor Not tainted 6.15.0-rc4-syzkaller-00147-gebd297a2affa #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:btrfs_put_block_group+0x2fb/0x350 fs/btrfs/block-group.c:159
Code: 42 80 3c 20 00 74 08 48 89 df e8 80 1c 41 fe bf e0 16 00 00 48 03 3b 48 89 de e8 40 7e 01 00 e9 c0 fe ff ff e8 06 4d e1 fd 90 <0f> 0b 90 e9 84 fe ff ff e8 f8 4c e1 fd e9 7a fe ff ff e8 ee 4c e1
RSP: 0018:ffffc90003c1fac0 EFLAGS: 00010293
RAX: ffffffff83de725a RBX: ffff88805b021000 RCX: ffff8880265f3c00
RDX: 0000000000000000 RSI: 0000000000010000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff88808e709af7 R09: 1ffff11011ce135e
R10: dffffc0000000000 R11: ffffed1011ce135f R12: dffffc0000000000
R13: ffff88805b021318 R14: 0000000000010000 R15: dffffc0000000000
FS:  0000555591a04500(0000) GS:ffff888126200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c297e4e CR3: 000000004feaa000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_free_block_groups+0xb71/0x1080 fs/btrfs/block-group.c:4493
 close_ctree+0x7be/0xcb0 fs/btrfs/disk-io.c:4486
 generic_shutdown_super+0x132/0x2c0 fs/super.c:642
 kill_anon_super+0x3b/0x70 fs/super.c:1237
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2099
 deactivate_locked_super+0xb9/0x130 fs/super.c:473
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1435
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x9a/0x120 kernel/entry/common.c:218
 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1e7298fc97
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffce0c668f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f1e72a1089d RCX: 00007f1e7298fc97
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffce0c669b0
RBP: 00007ffce0c669b0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffce0c67a40
R13: 00007f1e72a1089d R14: 000000000009329c R15: 00007ffce0c67a80
 </TASK>