VFS: Busy inodes after unmount of rpc_pipefs (rpc_pipefs)
------------[ cut here ]------------
kernel BUG at fs/super.c:654!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 PID: 31113 Comm: syz-executor.2 Not tainted 6.8.0-rc5-syzkaller-00278-g603c04e27c3e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:generic_shutdown_super+0x31b/0x3d0 fs/super.c:654
Code: 28 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 aa 00 00 00 48 8b 55 00 48 8d b3 68 06 00 00 48 c7 c7 a0 e0 1c 8b e8 36 2b 78 ff 90 <0f> 0b e8 ee 6f ef ff e9 2f fd ff ff e8 e4 6f ef ff e9 02 fd ff ff
RSP: 0018:ffffc900035afa60 EFLAGS: 00010282
RAX: 0000000000000039 RBX: ffff888025330000 RCX: ffffffff816d5009
RDX: 0000000000000000 RSI: ffffffff816dd886 RDI: 0000000000000005
RBP: ffffffff8f5b3420 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000113a08 R12: ffff8880253309c0
R13: ffff888025330760 R14: 0000000000000000 R15: ffff88807c13c580
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00a621080 CR3: 000000004c706000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kill_anon_super fs/super.c:1230 [inline]
 kill_litter_super+0x70/0xa0 fs/super.c:1240
 rpc_kill_sb+0xd5/0x1c0 net/sunrpc/rpc_pipe.c:1462
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:477
 deactivate_super+0xde/0x100 fs/super.c:510
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14f/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa8a/0x2ad0 kernel/exit.c:871
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020
 get_signal+0x23b9/0x2790 kernel/signal.c:2893
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [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+0x156/0x2b0 kernel/entry/common.c:212
 do_syscall_64+0xe5/0x270 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f3a4927dda9
Code: Unable to access opcode bytes at 0x7f3a4927dd7f.
RSP: 002b:00007f3a4a00b178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f3a493ac058 RCX: 00007f3a4927dda9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3a493ac058
RBP: 00007f3a493ac050 R08: 00007f3a4a00b6c0 R09: 00007f3a4a00b6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3a493ac05c
R13: 000000000000006e R14: 00007fff99dfe6e0 R15: 00007fff99dfe7c8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x31b/0x3d0 fs/super.c:654
Code: 28 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 aa 00 00 00 48 8b 55 00 48 8d b3 68 06 00 00 48 c7 c7 a0 e0 1c 8b e8 36 2b 78 ff 90 <0f> 0b e8 ee 6f ef ff e9 2f fd ff ff e8 e4 6f ef ff e9 02 fd ff ff
RSP: 0018:ffffc900035afa60 EFLAGS: 00010282
RAX: 0000000000000039 RBX: ffff888025330000 RCX: ffffffff816d5009
RDX: 0000000000000000 RSI: ffffffff816dd886 RDI: 0000000000000005
RBP: ffffffff8f5b3420 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000113a08 R12: ffff8880253309c0
R13: ffff888025330760 R14: 0000000000000000 R15: ffff88807c13c580
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f90fe1ec440 CR3: 00000000447f6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400