VFS: Busy inodes after unmount of loop4 (btrfs)
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kernel BUG at fs/super.c:505!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4239 Comm: syz-executor.4 Not tainted 6.1.87-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 60401005 (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 : ffff80001dfe78d0
x29: ffff80001dfe78d0 x28: 1ffff00002b09aa9 x27: dfff800000000000
x26: 0000000000000002 x25: 0000000000000002 x24: 1fffe0001e17c8fb
x23: dfff800000000000 x22: ffff8000126a0b80 x21: 0000000000000000
x20: ffff800015f1a1c0 x19: ffff0000f0be46a8 x18: 1fffe0003686f176
x17: ffff80001584d000 x16: ffff80001215c9dc x15: 0000000000000000
x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000000001
x11: 0000000000ff0100 x10: 0000000000000000 x9 : cd05f6467998be00
x8 : cd05f6467998be00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001dfe71d8 x4 : ffff800015932b00 x3 : ffff80000aa9158c
x2 : ffff0001b4378cd0 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:2449
 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:585
Code: f004c940 91328000 aa1303e1 95d36040 (d4210000) 
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