BTRFS info (device loop3): at unmount dio bytes count 16384
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WARNING: CPU: 1 PID: 5818 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: 5818 Comm: syz-executor Not tainted 6.15.0-syzkaller-03589-gfeacb1774bd5 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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 a0 43 3e fe bf 50 17 00 00 48 03 3b 48 89 de e8 10 83 01 00 e9 c0 fe ff ff e8 76 88 dd fd 90 <0f> 0b 90 e9 84 fe ff ff e8 68 88 dd fd e9 7a fe ff ff e8 5e 88 dd
RSP: 0018:ffffc9000445fac0 EFLAGS: 00010293
RAX: ffffffff83e26dca RBX: ffff88807ae2c800 RCX: ffff888025615a00
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff8880798f5b67 R09: 1ffff1100f31eb6c
R10: dffffc0000000000 R11: ffffed100f31eb6d R12: dffffc0000000000
R13: ffff88807ae2cb18 R14: 0000000000004000 R15: dffffc0000000000
FS:  0000555587840500(0000) GS:ffff8881261c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5d2b1f7e9c CR3: 000000005e8cc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_free_block_groups+0xb6b/0xf40 fs/btrfs/block-group.c:4551
 close_ctree+0x7e8/0xd60 fs/btrfs/disk-io.c:4411
 generic_shutdown_super+0x135/0x2c0 fs/super.c:643
 kill_anon_super+0x3b/0x70 fs/super.c:1287
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2095
 deactivate_locked_super+0xb9/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1432
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee5a38fc97
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:00007ffc67f75858 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fee5a41089d RCX: 00007fee5a38fc97
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc67f75910
RBP: 00007ffc67f75910 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc67f769a0
R13: 00007fee5a41089d R14: 0000000000025494 R15: 00007ffc67f769e0
 </TASK>