------------[ cut here ]------------
WARNING: CPU: 0 PID: 4748 at fs/btrfs/block-group.c:142 btrfs_put_block_group+0x269/0x280 fs/btrfs/block-group.c:142
Modules linked in:
CPU: 0 PID: 4748 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:btrfs_put_block_group+0x269/0x280 fs/btrfs/block-group.c:142
Code: ed 48 5a fe bf c8 15 00 00 48 03 3b 48 89 de e8 6d 4c 01 00 e9 4a ff ff ff e8 a3 28 15 fe 0f 0b e9 6a ff ff ff e8 97 28 15 fe <0f> 0b e9 04 ff ff ff e8 8b 28 15 fe e9 fa fe ff ff 66 0f 1f 44 00
RSP: 0018:ffffc90002ebfc38 EFLAGS: 00010293
RAX: ffffffff8363ca09 RBX: ffff888077434800 RCX: ffff888021c05940
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff888079bc19d7 R09: 1ffff1100f37833a
R10: dffffc0000000000 R11: ffffed100f37833b R12: ffff888077434b10
R13: ffff888077434800 R14: 0000000000003000 R15: dffffc0000000000
FS:  000055556ce52500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb3d7c35e9c CR3: 00000000210fd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_free_block_groups+0x7b8/0xc80 fs/btrfs/block-group.c:3982
 close_ctree+0x71b/0x8d0 fs/btrfs/disk-io.c:4505
 generic_shutdown_super+0x130/0x300 fs/super.c:475
 kill_anon_super+0x36/0x70 fs/super.c:1089
 btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2390
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x426/0x4d0 fs/namespace.c:1148
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdfb3e22157
Code: a2 c7 05 3c 84 23 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 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 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fffa57dec28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fdfb3eb533b RCX: 00007fdfb3e22157
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffa57dece0
RBP: 00007fffa57dece0 R08: 00007fffa57dfce0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa57dfd70
R13: 00007fdfb3eb533b R14: 000000000001a705 R15: 00007fffa57dfdb0
 </TASK>