------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff8880488c0050 object type: timer_list hint: hash_netiface4_gc+0x0/0x470 net/netfilter/ipset/ip_set_hash_gen.h:526 WARNING: CPU: 1 PID: 15835 at lib/debugobjects.c:514 debug_print_object+0x1a3/0x2b0 lib/debugobjects.c:514 Modules linked in: CPU: 1 PID: 15835 Comm: syz-executor.2 Not tainted 6.8.0-rc3-syzkaller-00010-g6d280f4d760e #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:debug_print_object+0x1a3/0x2b0 lib/debugobjects.c:514 Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 54 48 8b 14 dd c0 ca 4d 8b 41 56 4c 89 e6 48 c7 c7 20 be 4d 8b e8 1e 16 da fc 90 <0f> 0b 90 90 58 83 05 d5 fe 02 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d RSP: 0018:ffffc900222a7018 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffc900049e1000 RDX: 0000000000040000 RSI: ffffffff81505f16 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8b4dc4c0 R13: ffffffff8aef1b20 R14: ffffffff89136410 R15: ffffc900222a7128 FS: 0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5f1db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f7fcaea0 CR3: 000000005bcc2000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:989 [inline] debug_check_no_obj_freed+0x4b8/0x600 lib/debugobjects.c:1019 slab_free_hook mm/slub.c:2093 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x252/0x370 mm/slub.c:4409 hash_netiface4_destroy+0x204/0x3a0 net/netfilter/ipset/ip_set_hash_gen.h:460 ip_set_create+0xd30/0x12a0 net/netfilter/ipset/ip_set_core.c:1157 nfnetlink_rcv_msg+0x9c3/0x11e0 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2543 nfnetlink_rcv+0x1b4/0x430 net/netfilter/nfnetlink.c:659 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x8bb/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x9b4/0xb50 net/socket.c:2584 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2638 __sys_sendmsg+0x117/0x1f0 net/socket.c:2667 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 RIP: 0023:0xf7323579 Code: 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 00 00 00 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:00000000f5f1d5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000040 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi