VFS: Busy inodes after unmount of loop0 (btrfs)
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kernel BUG at fs/super.c:505!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 12024 Comm: syz-executor371 Not tainted 6.1.53-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:generic_shutdown_super+0x339/0x340 fs/super.c:503
Code: 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 19 db f0 ff 48 8b 13 48 c7 c7 e0 1e f9 8a 4c 89 fe e8 10 24 94 08 <0f> 0b 0f 1f 44 00 00 41 57 41 56 53 49 89 fe 49 bf 00 00 00 00 00
RSP: 0018:ffffc9000d5dfcf0 EFLAGS: 00010246
RAX: 000000000000002f RBX: ffffffff8d6392a0 RCX: b0000f2b82733b00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff1100f4a58fb R08: ffffffff816dbf1c R09: fffff52001abbf55
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8b2cdad8 R15: ffff88807a52c6a8
FS:  0000555555eca3c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6775a35798 CR3: 0000000076310000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kill_anon_super+0x37/0x60 fs/super.c:1117
 btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2445
 deactivate_locked_super+0xa0/0x110 fs/super.c:332
 cleanup_mnt+0x490/0x520 fs/namespace.c:1186
 task_work_run+0x246/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f67759e2ef7
Code: 08 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffec622abc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 000000000006f806 RCX: 00007f67759e2ef7
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffec622ac80
RBP: 00007ffec622ac80 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffec622bd40
R13: 0000555555ecb700 R14: 431bde82d7b634db R15: 00007ffec622bce4
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x339/0x340 fs/super.c:503
Code: 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 19 db f0 ff 48 8b 13 48 c7 c7 e0 1e f9 8a 4c 89 fe e8 10 24 94 08 <0f> 0b 0f 1f 44 00 00 41 57 41 56 53 49 89 fe 49 bf 00 00 00 00 00
RSP: 0018:ffffc9000d5dfcf0 EFLAGS: 00010246
RAX: 000000000000002f RBX: ffffffff8d6392a0 RCX: b0000f2b82733b00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff1100f4a58fb R08: ffffffff816dbf1c R09: fffff52001abbf55
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8b2cdad8 R15: ffff88807a52c6a8
FS:  0000555555eca3c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe7ba13ee8 CR3: 0000000076310000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400