================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xe7/0x100 lib/list_debug.c:54 Read of size 8 at addr ffff8881cbd26b78 by task kworker/1:2/6138 CPU: 1 PID: 6138 Comm: kworker/1:2 Not tainted 4.20.0-rc6-next-20181210+ #164 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.4+0x9/0x1ff mm/kasan/report.c:187 kasan_report.cold.5+0x1b/0x39 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 __list_del_entry_valid+0xe7/0x100 lib/list_debug.c:54 __list_del_entry include/linux/list.h:117 [inline] list_del_init include/linux/list.h:159 [inline] neigh_mark_dead+0x13b/0x410 net/core/neighbour.c:125 neigh_periodic_work+0x89a/0xc30 net/core/neighbour.c:905 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 11076: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc+0xcb/0xd0 mm/kasan/common.c:482 __do_kmalloc mm/slab.c:3709 [inline] __kmalloc+0x15d/0x760 mm/slab.c:3718 kmalloc include/linux/slab.h:550 [inline] kzalloc include/linux/slab.h:740 [inline] neigh_alloc net/core/neighbour.c:375 [inline] ___neigh_create+0x13fc/0x2600 net/core/neighbour.c:553 __neigh_create+0x30/0x40 net/core/neighbour.c:640 ip6_finish_output2+0xa64/0x2940 net/ipv6/ip6_output.c:117 ip6_finish_output+0x58c/0xc60 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x232/0x9d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] ip6_local_out+0xc5/0x1b0 net/ipv6/output_core.c:176 ip6_send_skb+0xbc/0x340 net/ipv6/ip6_output.c:1725 ip6_push_pending_frames+0xc5/0xf0 net/ipv6/ip6_output.c:1745 icmpv6_push_pending_frames+0x34a/0x540 net/ipv6/icmp.c:290 icmp6_send+0x2654/0x2d60 net/ipv6/icmp.c:582 icmpv6_send+0x180/0x310 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x9b/0x6c0 net/ipv6/route.c:2229 dst_link_failure include/net/dst.h:427 [inline] ndisc_error_report+0xd1/0x1c0 net/ipv6/ndisc.c:695 neigh_invalidate+0x246/0x550 net/core/neighbour.c:961 neigh_timer_handler+0xb07/0xdf0 net/core/neighbour.c:1047 call_timer_fn+0x272/0x920 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0x7e5/0xc70 kernel/time/timer.c:1681 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694 __do_softirq+0x308/0xb7e kernel/softirq.c:292 Freed by task 6159: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452 __cache_free mm/slab.c:3485 [inline] kfree+0xcf/0x230 mm/slab.c:3804 __rcu_reclaim kernel/rcu/rcu.h:233 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0xd91/0x15f0 kernel/rcu/tree.c:2754 __do_softirq+0x308/0xb7e kernel/softirq.c:292 The buggy address belongs to the object at ffff8881cbd26900 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 632 bytes inside of 1024-byte region [ffff8881cbd26900, ffff8881cbd26d00) The buggy address belongs to the page: page:ffffea00072f4980 count:1 mapcount:0 mapping:ffff8881da800ac0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea0006f23308 ffffea000745ca88 ffff8881da800ac0 raw: 0000000000000000 ffff8881cbd26000 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cbd26a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cbd26a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881cbd26b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881cbd26b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cbd26c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================