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
CPU: 0 PID: 5063 Comm: syz-executor882 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:generic_shutdown_super+0x318/0x3d0 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 e0 b0 dc 8a e8 e9 8c 7b ff 90 <0f> 0b e8 01 d1 ef ff e9 32 fd ff ff e8 f7 d0 ef ff e9 05 fd ff ff
RSP: 0018:ffffc900034efd20 EFLAGS: 00010286
RAX: 0000000000000039 RBX: ffff88801f568000 RCX: ffffffff8169d3d9
RDX: 0000000000000000 RSI: ffffffff816a58a2 RDI: 0000000000000005
RBP: ffffffff8ef80440 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88801f5689c0
R13: ffff88801f568760 R14: 0000000000000000 R15: ffff88802d679000
FS:  000055555673d480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcbb101d01d CR3: 0000000076f08000 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+0xbc/0x1a0 fs/super.c:477
 deactivate_super+0xde/0x100 fs/super.c:510
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14d/0x240 kernel/task_work.c:180
 ptrace_notify+0x10d/0x130 kernel/signal.c:2390
 ptrace_report_syscall include/linux/ptrace.h:411 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:473 [inline]
 syscall_exit_work kernel/entry/common.c:167 [inline]
 syscall_exit_to_user_mode_prepare+0x126/0x230 kernel/entry/common.c:194
 __syscall_exit_to_user_mode_work kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0x11/0x2b0 kernel/entry/common.c:212
 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fcbb0fd1457
Code: 07 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 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fffbf8d4188 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fcbb0fd1457
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007fffbf8d4240
RBP: 00007fffbf8d4240 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007fffbf8d52b0
R13: 000055555673e7c0 R14: 00007fffbf8d52b0 R15: 0000000000000037
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x318/0x3d0 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 e0 b0 dc 8a e8 e9 8c 7b ff 90 <0f> 0b e8 01 d1 ef ff e9 32 fd ff ff e8 f7 d0 ef ff e9 05 fd ff ff
RSP: 0018:ffffc900034efd20 EFLAGS: 00010286
RAX: 0000000000000039 RBX: ffff88801f568000 RCX: ffffffff8169d3d9
RDX: 0000000000000000 RSI: ffffffff816a58a2 RDI: 0000000000000005
RBP: ffffffff8ef80440 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88801f5689c0
R13: ffff88801f568760 R14: 0000000000000000 R15: ffff88802d679000
FS:  000055555673d480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffbf8d5178 CR3: 0000000076f08000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400