VFS: Busy inodes after unmount of loop0 (btrfs)
------------[ cut here ]------------
kernel BUG at fs/super.c:504!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 5965 Comm: syz-executor201 Not tainted 6.3.0-rc4-syzkaller-g59caa87f9dfb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : generic_shutdown_super+0x324/0x328 fs/super.c:502
lr : generic_shutdown_super+0x324/0x328 fs/super.c:502
sp : ffff80001e087860
x29: ffff80001e087860 x28: 1fffe0001a4df2da x27: 0000000000000008
x26: 0000000000000003 x25: dfff800000000000 x24: 1fffe0001a1e80fb
x23: dfff800000000000 x22: ffff800012834080 x21: 0000000000000000
x20: ffff80001621c960 x19: ffff0000d0f406a8 x18: ffff80001e0870c0
x17: ffff800015b5d000 x16: ffff8000122e7a54 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001
x11: ff8080000834dfc4 x10: 0000000000000000 x9 : fcd630913e195a00
x8 : fcd630913e195a00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001e087178 x4 : ffff800015c43fe0 x3 : ffff80000aa5e384
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002f
Call trace:
 generic_shutdown_super+0x324/0x328 fs/super.c:502
 kill_anon_super+0x4c/0x74 fs/super.c:1107
 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2133
 deactivate_locked_super+0xac/0x124 fs/super.c:331
 deactivate_super+0xe0/0x100 fs/super.c:362
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1177
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1184
 task_work_run+0x230/0x2e0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1302
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
Code: f004d620 91238000 aa1303e1 95d2ce20 (d4210000) 
---[ end trace 0000000000000000 ]---