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 PTI
CPU: 0 PID: 21585 Comm: syz-executor.2 Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #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 5c 92 ee ff 48 8b 13 48 c7 c7 40 e9 b7 8b 4c 89 e6 e8 8a 98 57 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:ffffc9000439fce0 EFLAGS: 00010246
RAX: 0000000000000039 RBX: ffffffff8f520140 RCX: 16b125370240c200
RDX: ffffc9000b380000 RSI: 0000000000033513 RDI: 0000000000033514
RBP: 1ffff11005968cec R08: ffffffff81753e5c R09: 1ffff92000873f3c
R10: dffffc0000000000 R11: fffff52000873f3d R12: ffff88802cb46668
R13: dffffc0000000000 R14: ffffffff8cb48698 R15: ffff88802cb46760
FS:  00007f0f939d06c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30d25000 CR3: 000000002ecfa000 CR4: 00000000003506f0
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+0xc4/0x130 fs/super.c:477
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
 task_work_run+0x24e/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: 0033:0x7f0f92c7dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0f939d00c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: 0000000000000000 RBX: 00007f0f92dac050 RCX: 00007f0f92c7dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000740
RBP: 00007f0f92cca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f0f92dac050 R15: 00007ffe13d629a8
 </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 5c 92 ee ff 48 8b 13 48 c7 c7 40 e9 b7 8b 4c 89 e6 e8 8a 98 57 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:ffffc9000439fce0 EFLAGS: 00010246
RAX: 0000000000000039 RBX: ffffffff8f520140 RCX: 16b125370240c200
RDX: ffffc9000b380000 RSI: 0000000000033513 RDI: 0000000000033514
RBP: 1ffff11005968cec R08: ffffffff81753e5c R09: 1ffff92000873f3c
R10: dffffc0000000000 R11: fffff52000873f3d R12: ffff88802cb46668
R13: dffffc0000000000 R14: ffffffff8cb48698 R15: ffff88802cb46760
FS:  00007f0f939d06c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000201c3030 CR3: 000000002ecfa000 CR4: 00000000003506f0