VFS: Busy inodes after unmount of loop0 (btrfs)
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kernel BUG at fs/super.c:505!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4258 Comm: syz-executor.0 Not tainted 6.1.54-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : generic_shutdown_super+0x324/0x328 fs/super.c:503
lr : generic_shutdown_super+0x324/0x328 fs/super.c:503
sp : ffff80001dee78d0
x29: ffff80001dee78d0 x28: 1ffff00002b15aa9 x27: dfff800000000000
x26: 0000000000000002 x25: 0000000000000002 x24: 1fffe00029303cfb
x23: dfff800000000000 x22: ffff80001265d5c0 x21: 0000000000000000
x20: ffff800015f75260 x19: ffff00014981e6a8 x18: ffff80001dee7120
x17: ffff80019ed4e000 x16: ffff800012124b14 x15: 0000000000000000
x14: 0000000000000000 x13: fffffffffffeff90 x12: 0000000000000001
x11: ff80800008345944 x10: 0000000000000000 x9 : 8128ae65ab246500
x8 : 8128ae65ab246500 x7 : fffffffffffeff90 x6 : fffffffffffeff48
x5 : ffff80001dee71d8 x4 : ffff800015972cd8 x3 : ffff80000aa7fa6c
x2 : ffff0001b454fcd0 x1 : 0000000100000000 x0 : 000000000000002f
Call trace:
 generic_shutdown_super+0x324/0x328 fs/super.c:503
 kill_anon_super+0x4c/0x74 fs/super.c:1117
 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2445
 deactivate_locked_super+0xac/0x124 fs/super.c:332
 deactivate_super+0xf0/0x110 fs/super.c:363
 cleanup_mnt+0x394/0x41c fs/namespace.c:1186
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193
 task_work_run+0x240/0x2f0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132
 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+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: 9004c780 91298000 aa1303e1 95d389fc (d4210000) 
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