IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: alloca-out-of-bounds in __read_once_size include/linux/compiler.h:188 [inline]
BUG: KASAN: alloca-out-of-bounds in unwind_next_frame.part.7+0x7ce/0x9c0 arch/x86/kernel/unwind_frame.c:326
Read of size 8 at addr ffff8801d845f1b8 by task ip/4694

CPU: 0 PID: 4694 Comm: ip Not tainted 4.16.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b9/0x29f lib/dump_stack.c:53
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 __read_once_size include/linux/compiler.h:188 [inline]
 unwind_next_frame.part.7+0x7ce/0x9c0 arch/x86/kernel/unwind_frame.c:326
 unwind_next_frame+0x3e/0x50 arch/x86/kernel/unwind_frame.c:287
 __save_stack_trace+0x6e/0xd0 arch/x86/kernel/stacktrace.c:44
 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3486 [inline]
 kmem_cache_free+0x86/0x2d0 mm/slab.c:3744
 file_free_rcu+0x6f/0x90 fs/file_table.c:49
 __rcu_reclaim kernel/rcu/rcu.h:178 [inline]
 rcu_do_batch kernel/rcu/tree.c:2675 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
 rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914
 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0x1d1/0x200 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:525 [inline]
 smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862
 </IRQ>
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:28 [inline]
RIP: 0010:kasan_poison_shadow mm/kasan/kasan.c:62 [inline]
RIP: 0010:kasan_unpoison_shadow+0xf/0x50 mm/kasan/kasan.c:69
RSP: 0018:ffff8801d845f1a8 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff12
RAX: 1ffff1003b08be39 RBX: 000000009bdc8100 RCX: ffffffff85c03f14
RDX: 0000000000000000 RSI: 00000000000001c8 RDI: 1ffff1003b08be00
RBP: ffff8801d845f1b8 R08: ffff8801abc743c0 R09: ffffed003b08bde4
R10: ffffed003b08bde4 R11: 0000000000000003 R12: ffff8801d845f5d0
R13: 0000000000000000 R14: ffffffff8958d940 R15: 0000000000000000
 put_net include/net/net_namespace.h:225 [inline]
 rtnl_newlink+0x1094/0x1a40 net/core/rtnetlink.c:3070
 rtnetlink_rcv_msg+0x466/0xc10 net/core/rtnetlink.c:4646
 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2446
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4664
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x58b/0x740 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x9d8/0xf80 net/netlink/af_netlink.c:1899
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x805/0x940 net/socket.c:2117
 __sys_sendmsg+0x115/0x270 net/socket.c:2155
 SYSC_sendmsg net/socket.c:2164 [inline]
 SyS_sendmsg+0x29/0x30 net/socket.c:2162
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f3447a0d320
RSP: 002b:00007ffe1be7dac8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffe1be81bc0 RCX: 00007f3447a0d320
RDX: 0000000000000000 RSI: 00007ffe1be7db00 RDI: 0000000000000013
RBP: 00007ffe1be7db00 R08: 0000000000000000 R09: 00007f3447cbc0b0
R10: 0000000000000000 R11: 0000000000000246 R12: 000000005ac7919e
R13: 0000000000000000 R14: 00000000006395c0 R15: 00007ffe1be823a0

The buggy address belongs to the page:
page:ffffea00076117c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea0007610101 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d845f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d845f100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d845f180: 00 cb cb cb cb cb cb cb 00 00 00 00 00 00 00 00
                                        ^
 ffff8801d845f200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
 ffff8801d845f280: f1 f1 00 f2 f2 f2 f2 f2 f2 f2 00 00 f2 f2 f2 f2
==================================================================