------------[ cut here ]------------
WARNING: CPU: 0 PID: 5840 at fs/btrfs/block-group.c:159 btrfs_put_block_group+0x2f8/0x350 fs/btrfs/block-group.c:159
Modules linked in:

CPU: 0 UID: 0 PID: 5840 Comm: syz-executor 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:btrfs_put_block_group+0x2f8/0x350 fs/btrfs/block-group.c:159
Code: 42 80 3c 20 00 74 08 4c 89 f7 e8 a3 f8 15 fe bf e0 16 00 00 49 03 3e 4c 89 f6 e8 83 9e 01 00 e9 c1 fe ff ff e8 f9 4f ae fd 90 <0f> 0b 90 e9 85 fe ff ff e8 eb 4f ae fd e9 7b fe ff ff e8 e1 4f ae
RSP: 0018:ffffc900040ffac8 EFLAGS: 00010293

RAX: ffffffff8414f477 RBX: 0000000000002000 RCX: ffff8880607c8000
RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8414f2f7 R09: 1ffff110041f1b5e
R10: dffffc0000000000 R11: ffffed10041f1b5f R12: dffffc0000000000
R13: 1ffff1100506762e R14: ffff88802833b000 R15: ffff888020f8c188
FS:  0000555588ec8500(0000) GS:ffff888124fc9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feace2d56c0 CR3: 000000006177c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_free_block_groups+0xb7c/0x1080 fs/btrfs/block-group.c:4493
 close_ctree+0x7d0/0xdb0 fs/btrfs/disk-io.c:4488
 generic_shutdown_super+0x139/0x2d0 fs/super.c:642
 kill_anon_super+0x3b/0x70 fs/super.c:1237
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2100
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435
 task_work_run+0x251/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 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+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f44f4f8e497
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:00007ffd5c84e9b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f44f500e77c RCX: 00007f44f4f8e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd5c84ea70
RBP: 00007ffd5c84ea70 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd5c84fb00
R13: 00007f44f500e77c R14: 000000000002094e R15: 00007ffd5c84fb40
 </TASK>