VFS: Busy inodes after unmount of rpc_pipefs (rpc_pipefs)
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kernel BUG at fs/super.c:656!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 9672 Comm: syz-executor.0 Not tainted 6.8.0-rc5-syzkaller-00329-gab0a97cffa0b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:generic_shutdown_super+0x2c7/0x2d0 fs/super.c:654
Code: 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 3c 90 ee ff 48 8b 13 48 c7 c7 40 fc b7 8b 4c 89 e6 e8 da 17 5d 09 90 <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900045b7ce0 EFLAGS: 00010246
RAX: 0000000000000039 RBX: ffffffff8f532680 RCX: d3a8d9a2252d7200
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff110113028ec R08: ffffffff81753f5c R09: 1ffff920008b6f3c
R10: dffffc0000000000 R11: fffff520008b6f3d R12: ffff888089814668
R13: dffffc0000000000 R14: ffffffff8cb55a98 R15: ffff888089814760
FS:  0000555555fa7480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f007a200000 CR3: 000000002e7de000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 kill_anon_super fs/super.c:1230 [inline]
 kill_litter_super+0x76/0xb0 fs/super.c:1240
 rpc_kill_sb+0xde/0x190 net/sunrpc/rpc_pipe.c:1462
 deactivate_locked_super+0xc6/0x130 fs/super.c:477
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
 task_work_run+0x250/0x310 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x167/0x370 kernel/entry/common.c:212
 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fe5d467cc9a
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24
RSP: 002b:00007ffec7ecbcb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007fe5d467cc9a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000032 R08: 0000001b32820000 R09: 0000000000000054
R10: 000000008135d5c6 R11: 0000000000000293 R12: 00007fe5d4200198
R13: ffffffffffffffff R14: 00007fe5d4200000 R15: 000000000005d441
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x2c7/0x2d0 fs/super.c:654
Code: 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 3c 90 ee ff 48 8b 13 48 c7 c7 40 fc b7 8b 4c 89 e6 e8 da 17 5d 09 90 <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900045b7ce0 EFLAGS: 00010246
RAX: 0000000000000039 RBX: ffffffff8f532680 RCX: d3a8d9a2252d7200
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff110113028ec R08: ffffffff81753f5c R09: 1ffff920008b6f3c
R10: dffffc0000000000 R11: fffff520008b6f3d R12: ffff888089814668
R13: dffffc0000000000 R14: ffffffff8cb55a98 R15: ffff888089814760
FS:  0000555555fa7480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa40d1ac008 CR3: 000000002e7de000 CR4: 0000000000350ef0