------------[ cut here ]------------
kmem_cache_destroy 9p-fcall-cache: Slab cache still has objects when called from p9_client_destroy+0x213/0x370 net/9p/client.c:1100
WARNING: CPU: 0 PID: 3640 at mm/slab_common.c:506 kmem_cache_destroy mm/slab_common.c:506 [inline]
WARNING: CPU: 0 PID: 3640 at mm/slab_common.c:506 kmem_cache_destroy+0x13b/0x140 mm/slab_common.c:494
Modules linked in:
CPU: 1 PID: 3640 Comm: syz-executor.4 Not tainted 5.19.0-rc7-syzkaller-00190-g70664fc10c0d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
RIP: 0010:kmem_cache_destroy mm/slab_common.c:506 [inline]
RIP: 0010:kmem_cache_destroy+0x13b/0x140 mm/slab_common.c:494
Code: ff 48 0f 48 89 ee e8 c4 89 18 00 eb c1 c3 48 8b 55 58 48 c7 c6 a0 99 d7 89 48 c7 c7 f8 90 61 8b 48 8b 4c 24 18 e8 51 36 85 07 <0f> 0b eb a0 90 48 85 f6 74 46 41 55 49 89 d5 41 54 49 89 f4 55 48
RSP: 0018:ffffc90003177cf0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 1ffff9200062efa5 RCX: 0000000000000000
RDX: ffff88802bb3e000 RSI: ffffffff815ffd08 RDI: fffff5200062ef90
RBP: ffff888021b17600 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffffc90003177d68 R14: dffffc0000000000 R15: 0000000000000000
FS:  00005555571df400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e94a000 CR3: 000000002c69d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 p9_client_destroy+0x213/0x370 net/9p/client.c:1100
 v9fs_session_close+0x45/0x2d0 fs/9p/v9fs.c:504
 v9fs_kill_super+0x49/0x90 fs/9p/vfs_super.c:226
 deactivate_locked_super+0x94/0x160 fs/super.c:332
 deactivate_super+0xad/0xd0 fs/super.c:363
 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1186
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4182c8a677
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:00007fff3cc20068 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f4182c8a677
RDX: 00007fff3cc2013b RSI: 000000000000000a RDI: 00007fff3cc20130
RBP: 00007fff3cc20130 R08: 00000000ffffffff R09: 00007fff3cc1ff00
R10: 00005555571e08b3 R11: 0000000000000246 R12: 00007f4182ce22a6
R13: 00007fff3cc211f0 R14: 00005555571e0810 R15: 00007fff3cc21230
 </TASK>