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BUG: KASAN: slab-out-of-bounds in __list_del_entry_valid+0xf1/0x100 lib/list_debug.c:51
Read of size 8 at addr ffff888179b59930 by task kworker/0:3/6360

CPU: 0 PID: 6360 Comm: kworker/0:3 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+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+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 13829:
 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
 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:397
 kmem_cache_alloc+0x130/0x730 mm/slab.c:3541
 getname_flags+0xd0/0x590 fs/namei.c:140
 user_path_at_empty+0x2d/0x50 fs/namei.c:2608
 user_path_at include/linux/namei.h:57 [inline]
 inotify_find_inode+0x2d/0xe0 fs/notify/inotify/inotify_user.c:349
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:741 [inline]
 __se_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:696 [inline]
 __x64_sys_inotify_add_watch+0x20c/0x390 fs/notify/inotify/inotify_user.c:696
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 13829:
 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]
 kmem_cache_free+0x83/0x290 mm/slab.c:3747
 putname+0xf2/0x130 fs/namei.c:261
 filename_lookup+0x39a/0x520 fs/namei.c:2357
 user_path_at_empty+0x40/0x50 fs/namei.c:2608
 user_path_at include/linux/namei.h:57 [inline]
 inotify_find_inode+0x2d/0xe0 fs/notify/inotify/inotify_user.c:349
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:741 [inline]
 __se_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:696 [inline]
 __x64_sys_inotify_add_watch+0x20c/0x390 fs/notify/inotify/inotify_user.c:696
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888179b58300
 which belongs to the cache names_cache of size 4096
The buggy address is located 1584 bytes to the right of
 4096-byte region [ffff888179b58300, ffff888179b59300)
The buggy address belongs to the page:
page:ffffea0005e6d600 count:1 mapcount:0 mapping:ffff8881da980e00 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000010200(slab|head)
raw: 02fffc0000010200 ffffea0006121988 ffffea00061a9a88 ffff8881da980e00
raw: 0000000000000000 ffff888179b58300 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888179b59800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888179b59880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888179b59900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff888179b59980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888179b59a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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