audit: type=1400 audit(1599873442.828:8): avc:  denied  { execmem } for  pid=6464 comm="syz-executor872" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3294
Read of size 8 at addr ffff8882160c8fe0 by task syz-executor872/6465

CPU: 0 PID: 6465 Comm: syz-executor872 Not tainted 4.19.144-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3294
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907
 __mutex_lock_common kernel/locking/mutex.c:925 [inline]
 __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072
 xt_find_match net/netfilter/x_tables.c:189 [inline]
 xt_find_match+0xa3/0x280 net/netfilter/x_tables.c:181
 xt_request_find_match net/netfilter/x_tables.c:219 [inline]
 xt_request_find_match+0x88/0x110 net/netfilter/x_tables.c:212
 get_xt_match net/sched/em_ipt.c:112 [inline]
 em_ipt_change+0x1c7/0x46b net/sched/em_ipt.c:132
 tcf_em_validate net/sched/ematch.c:248 [inline]
 tcf_em_tree_validate net/sched/ematch.c:365 [inline]
 tcf_em_tree_validate+0x8fa/0xe95 net/sched/ematch.c:307
 flow_change+0x2a4/0x1ca0 net/sched/cls_flow.c:439
 tc_new_tfilter+0xb52/0x16c0 net/sched/cls_api.c:1320
 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778
 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:632
 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
 __sys_sendmmsg+0x195/0x470 net/socket.c:2210
 __do_sys_sendmmsg net/socket.c:2239 [inline]
 __se_sys_sendmmsg net/socket.c:2236 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440d09
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 0f 83 fb 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd6392a5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00000000004a2570 RCX: 0000000000440d09
RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00007ffd6392a5c0 R08: 0000000120080522 R09: 0000000120080522
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2570
R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 1:
 kmem_cache_alloc+0x122/0x370 mm/slab.c:3559
 kmem_cache_zalloc include/linux/slab.h:699 [inline]
 __proc_create+0x2b3/0x860 fs/proc/generic.c:408
 proc_create_reg+0xb2/0x180 fs/proc/generic.c:528
 proc_create_net_single+0x84/0x170 fs/proc/proc_net.c:199
 ip6_route_net_init_late+0x86/0xa0 net/ipv6/route.c:5342
 ops_init+0xb3/0x410 net/core/net_namespace.c:129
 __register_pernet_operations net/core/net_namespace.c:943 [inline]
 register_pernet_operations+0x32f/0x790 net/core/net_namespace.c:1014
 register_pernet_subsys+0x25/0x40 net/core/net_namespace.c:1055
 ip6_route_init+0x13d/0x3ae net/ipv6/route.c:5450
 inet6_init+0x2ec/0x6b3 net/ipv6/af_inet6.c:1010
 do_one_initcall+0xf1/0x734 init/main.c:884
 do_initcall_level init/main.c:952 [inline]
 do_initcalls init/main.c:960 [inline]
 do_basic_setup init/main.c:978 [inline]
 kernel_init_freeable+0x9ab/0xa9d init/main.c:1145
 kernel_init+0xd/0x1bd init/main.c:1062
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8882160c8e40
 which belongs to the cache proc_dir_entry of size 256
The buggy address is located 160 bytes to the right of
 256-byte region [ffff8882160c8e40, ffff8882160c8f40)
The buggy address belongs to the page:
page:ffffea0008583200 count:1 mapcount:0 mapping:ffff88821b6856c0 index:0x0
flags: 0x57ffe0000000100(slab)
raw: 057ffe0000000100 ffffea000859fc88 ffffea0008583748 ffff88821b6856c0
raw: 0000000000000000 ffff8882160c8080 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8882160c8e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8882160c8f00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff8882160c8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff8882160c9000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8882160c9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================