VFS: Busy inodes after unmount of loop5 (btrfs)
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kernel BUG at fs/super.c:505!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3593 Comm: syz-executor.5 Not tainted 6.1.59-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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 e9 c6 f0 ff 48 8b 13 48 c7 c7 a0 1f f9 8a 4c 89 fe e8 90 d2 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:ffffc9000421fcf0 EFLAGS: 00010246
RAX: 000000000000002f RBX: ffffffff8d6392a0 RCX: b4b154478c826500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff11010a344fb R08: ffffffff816e03dc R09: fffff52000843f3d
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8b2cda98 R15: ffff8880851a26a8
FS:  000055555624f480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff321b4ff8 CR3: 000000003ea92000 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:2446
 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+0xde/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: 0033:0x7efc1307de17
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 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:00007ffda9ea2c58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007efc1307de17
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffda9ea2d10
RBP: 00007ffda9ea2d10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffda9ea3dd0
R13: 00007efc130c73b9 R14: 000000000013d01b R15: 0000000000000004
 </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 e9 c6 f0 ff 48 8b 13 48 c7 c7 a0 1f f9 8a 4c 89 fe e8 90 d2 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:ffffc9000421fcf0 EFLAGS: 00010246
RAX: 000000000000002f RBX: ffffffff8d6392a0 RCX: b4b154478c826500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff11010a344fb R08: ffffffff816e03dc R09: fffff52000843f3d
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8b2cda98 R15: ffff8880851a26a8
FS:  000055555624f480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32e23000 CR3: 000000003ea92000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400