VFS: Busy inodes after unmount of loop0 (btrfs)
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kernel BUG at fs/super.c:504!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 5988 Comm: syz-executor746 Not tainted 6.4.0-rc3-syzkaller-geb0f1697d729 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
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 : ffff80001ebb7860
x29: ffff80001ebb7860 x28: 1fffe0001b11a1ba x27: 0000000000000008
x26: 0000000000000003 x25: dfff800000000000 x24: 1fffe00019d764fb
x23: dfff800000000000 x22: ffff800012985700 x21: 0000000000000000
x20: ffff80001657e920 x19: ffff0000cebb26a8 x18: ffff80001ebb70a0
x17: ffff800015ebd000 x16: ffff8000124340b0 x15: 0000000000000001
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : d2ff5b28a071cd00
x8 : d2ff5b28a071cd00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001ebb7178 x4 : ffff800015f9e800 x3 : ffff80000aa946e4
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:2138
 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:1305
 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+0x90/0x15c 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: b004df40 911c8000 aa1303e1 95d2e0eb (d4210000) 
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