BTRFS info (device loop4): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
VFS: Busy inodes after unmount of loop4 (btrfs)
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kernel BUG at fs/super.c:652!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 6479 Comm: syz-executor Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : generic_shutdown_super+0x2b8/0x2bc fs/super.c:650
lr : generic_shutdown_super+0x2b8/0x2bc fs/super.c:650
sp : ffff8000a3ef7ba0
x29: ffff8000a3ef7ba0 x28: 1fffe0001dbd2c43 x27: 0000000000000008
x26: 0000000000000003 x25: dfff800000000000 x24: 1fffe00019c7e0f0
x23: ffff80008be6c7c0 x22: dfff800000000000 x21: 0000000000000000
x20: ffff80009067d840 x19: ffff0000ce3f0668 x18: 0000000000000008
x17: ffff80008ff2e000 x16: ffff80008333712c x15: 0000000000000001
x14: 1ffff000147deed0 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000001 x10: 0000000000ff0100 x9 : 4ad79eaa7cf8ec00
x8 : 4ad79eaa7cf8ec00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000a3ef7358 x4 : ffff8000900254e0 x3 : ffff8000832c769c
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002f
Call trace:
 generic_shutdown_super+0x2b8/0x2bc fs/super.c:650 (P)
 kill_anon_super+0x4c/0x7c fs/super.c:1237
 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2100
 deactivate_locked_super+0xc4/0x12c fs/super.c:473
 deactivate_super+0xe0/0x100 fs/super.c:506
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1435
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1442
 task_work_run+0x230/0x2e0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: d0056fc0 91028000 aa1303e1 97cf3a90 (d4210000) 
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