BTRFS info (device loop4): last unmount of filesystem 9ff4fc17-eee9-4830-a3ad-21237a4b685d
VFS: Busy inodes after unmount of loop4 (btrfs)
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kernel BUG at fs/super.c:652!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 7275 Comm: syz-executor Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:generic_shutdown_super+0x2bc/0x2c0 fs/super.c:650
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 6e 3b ef ff 49 8b 16 48 81 c3 68 06 00 00 48 c7 c7 60 e0 78 8b 48 89 de e8 b5 3f f7 fe 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f
RSP: 0000:ffffc90004d37d10 EFLAGS: 00010246
RAX: 000000000000002f RBX: ffff88803e000668 RCX: 0a53c49f10633900
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff11007c000f0 R08: ffffc90004d379e7 R09: 1ffff920009a6f3c
R10: dffffc0000000000 R11: fffff520009a6f3d R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8e4ac540 R15: ffff88803e000780
FS:  0000555574695500(0000) GS:ffff8881260d7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba4929d000 CR3: 0000000035d0c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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: 0033:0x7fdcf7b8fc97
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:00007ffdc252f2d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fdcf7c1089d RCX: 00007fdcf7b8fc97
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdc252f390
RBP: 00007ffdc252f390 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdc2530420
R13: 00007fdcf7c1089d R14: 000000000003c26d R15: 00007ffdc2530460
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x2bc/0x2c0 fs/super.c:650
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 6e 3b ef ff 49 8b 16 48 81 c3 68 06 00 00 48 c7 c7 60 e0 78 8b 48 89 de e8 b5 3f f7 fe 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f
RSP: 0000:ffffc90004d37d10 EFLAGS: 00010246
RAX: 000000000000002f RBX: ffff88803e000668 RCX: 0a53c49f10633900
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff11007c000f0 R08: ffffc90004d379e7 R09: 1ffff920009a6f3c
R10: dffffc0000000000 R11: fffff520009a6f3d R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8e4ac540 R15: ffff88803e000780
FS:  0000555574695500(0000) GS:ffff8881261d7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560ab9ea5950 CR3: 0000000035d0c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400