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: 4271 Comm: syz-executor.0 Not tainted 6.1.56-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 : ffff80001df778d0
x29: ffff80001df778d0 x28: 1ffff00002b15aa9 x27: dfff800000000000
x26: 0000000000000002 x25: 0000000000000002 x24: 1fffe000243368fb
x23: dfff800000000000 x22: ffff80001265d6c0 x21: 0000000000000000
x20: ffff800015f753c0 x19: ffff0001219b46a8 x18: ffff80001df76d40
x17: 00000000ffff0000 x16: ffff8000121265ec x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001
x11: ff808000083467a8 x10: 0000000000000000 x9 : 334cf9e58e3f0400
x8 : 334cf9e58e3f0400 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001df771d8 x4 : ffff8000159929c0 x3 : ffff80000aa84bcc
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+0x2148/0x3474 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: d004c760 912d8000 aa1303e1 95d398f7 (d4210000) 
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