------------[ 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: 1 PID: 4086 at mm/slab_common.c:502 kmem_cache_destroy mm/slab_common.c:502 [inline] WARNING: CPU: 1 PID: 4086 at mm/slab_common.c:502 kmem_cache_destroy+0x138/0x140 mm/slab_common.c:490 Modules linked in: CPU: 0 PID: 4086 Comm: syz-executor.2 Not tainted 5.18.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:kmem_cache_destroy mm/slab_common.c:502 [inline] RIP: 0010:kmem_cache_destroy+0x138/0x140 mm/slab_common.c:490 Code: f2 17 00 48 89 ef e8 e7 f2 17 00 eb cc c3 48 8b 55 60 48 c7 c6 60 1f d7 89 48 c7 c7 18 68 5c 8b 48 8b 4c 24 18 e8 28 ca 6d 07 <0f> 0b eb ab 0f 1f 40 00 41 56 41 89 d6 41 55 49 89 f5 41 54 49 89 RSP: 0018:ffffc90001e2fcd0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 1ffff920003c5fa1 RCX: 0000000000000000 RDX: ffff888016670000 RSI: ffffffff815fccf8 RDI: fffff520003c5f8c RBP: ffff8880436e57c0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815f76ce R11: 0000000000000000 R12: 0000000000000001 R13: ffffc90001e2fd48 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802ca00000(0063) knlGS:00000000575c7380 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f6f36110 CR3: 0000000068958000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:164 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+0x19/0x60 kernel/entry/common.c:294 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f69549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000fff05c1c EFLAGS: 00000292 ORIG_RAX: 0000000000000034 RAX: 0000000000000000 RBX: 00000000fff05cc0 RCX: 000000000000000a RDX: 00000000f6f36000 RSI: 0000000000000000 RDI: 00000000f6eaf462 RBP: 00000000fff05cc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi