A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check.
A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check.
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xf1/0x100 lib/list_debug.c:51
Read of size 8 at addr ffff8880898f9950 by task kworker/0:10/7703

CPU: 0 PID: 7703 Comm: kworker/0:10 Not tainted 4.20.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient neigh_periodic_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x16b/0x224 lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
NOHZ: local_softirq_pending 08
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 __list_del_entry_valid+0xf1/0x100 lib/list_debug.c:51
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_init include/linux/list.h:159 [inline]
 neigh_mark_dead+0x86/0x210 net/core/neighbour.c:125
 neigh_periodic_work+0x56f/0x870 net/core/neighbour.c:905
 process_one_work+0x830/0x1670 kernel/workqueue.c:2153
 worker_thread+0x85/0xb60 kernel/workqueue.c:2296
 kthread+0x324/0x3e0 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 3925:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3684 [inline]
 __kmalloc_node_track_caller+0x50/0x70 mm/slab.c:3698
 __kmalloc_reserve.isra.43+0x2c/0xc0 net/core/skbuff.c:137
 __alloc_skb+0xd7/0x580 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:1008 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
 netlink_sendmsg+0x810/0xc40 net/netlink/af_netlink.c:1892
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xb5/0xf0 net/socket.c:631
 ___sys_sendmsg+0x647/0x950 net/socket.c:2116
 __sys_sendmsg+0xd9/0x180 net/socket.c:2154
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg net/socket.c:2161 [inline]
 __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2161
 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7370:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x220 mm/slab.c:3817
 skb_free_head+0x74/0x90 net/core/skbuff.c:550
 skb_release_data+0x510/0x780 net/core/skbuff.c:570
 skb_release_all+0x3d/0x50 net/core/skbuff.c:627
 __kfree_skb net/core/skbuff.c:641 [inline]
 consume_skb+0x91/0x270 net/core/skbuff.c:701
 skb_free_datagram+0x12/0xc0 net/core/datagram.c:329
 netlink_recvmsg+0x5e3/0xe60 net/netlink/af_netlink.c:1996
 sock_recvmsg_nosec net/socket.c:794 [inline]
 sock_recvmsg+0xb7/0xf0 net/socket.c:801
 ___sys_recvmsg+0x219/0x530 net/socket.c:2278
 __sys_recvmsg+0xd6/0x180 net/socket.c:2327
 __do_sys_recvmsg net/socket.c:2337 [inline]
 __se_sys_recvmsg net/socket.c:2334 [inline]
 __x64_sys_recvmsg+0x73/0xb0 net/socket.c:2334
 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880898f96c0
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 656 bytes inside of
 1024-byte region [ffff8880898f96c0, ffff8880898f9ac0)
The buggy address belongs to the page:
page:ffffea0002263e00 count:1 mapcount:0 mapping:ffff88812c3f6ac0 index:0x0 compound_mapcount: 0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea0002a53f88 ffffea00025d5208 ffff88812c3f6ac0
raw: 0000000000000000 ffff8880898f8040 0000000100000007 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880898f9800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880898f9880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880898f9900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8880898f9980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880898f9a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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