------------[ cut here ]------------ kmem_cache_destroy 9p-fcall-cache: Slab cache still has objects when called from p9_client_destroy+0x1c1/0x2c0 net/9p/client.c:1095 WARNING: CPU: 1 PID: 4066 at mm/slab_common.c:502 kmem_cache_destroy+0x129/0x130 mm/slab_common.c:502 Modules linked in: CPU: 1 PID: 4066 Comm: syz-executor.0 Not tainted 5.16.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 RIP: 0010:kmem_cache_destroy+0x129/0x130 mm/slab_common.c:502 Code: 48 89 ef e8 39 50 12 00 e9 1d ff ff ff c3 48 8b 55 60 48 c7 c6 40 44 d5 88 48 c7 c7 88 73 46 8a 48 8b 4c 24 18 e8 3c 37 a4 06 <0f> 0b e9 f9 fe ff ff 55 48 89 e5 41 57 41 89 d7 41 56 49 89 f6 41 RSP: 0018:ffffc9000263fd20 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 1ffff920004c7fab RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff520004c7f96 RBP: ffff88807389d140 R08: 0000000000000001 R09: ffff8880b9d27aab R10: ffffed10173a4f55 R11: 0000000000000001 R12: 0000000000000000 R13: ffff8880111738c8 R14: dffffc0000000000 R15: ffffc9000263fd98 FS: 0000555555913400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffd5fb7e88 CR3: 0000000074315000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: p9_client_destroy+0x1c1/0x2c0 net/9p/client.c:1095 v9fs_session_close+0x38/0x290 fs/9p/v9fs.c:500 v9fs_kill_super+0x44/0x90 fs/9p/vfs_super.c:225 deactivate_locked_super+0x7b/0x130 fs/super.c:335 cleanup_mnt+0x324/0x4d0 fs/namespace.c:1137 task_work_run+0xc0/0x160 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0x80 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff41f98b677 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 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 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffd5fb85c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff41f98b677 RDX: 00007fffd5fb869c RSI: 000000000000000a RDI: 00007fffd5fb8690 RBP: 00007fffd5fb8690 R08: 00000000ffffffff R09: 00007fffd5fb8460 R10: 00005555559148b3 R11: 0000000000000246 R12: 00007ff41f9e32a6 R13: 00007fffd5fb9750 R14: 0000555555914810 R15: 00007fffd5fb9790