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BUG: KASAN: slab-out-of-bounds in __hlist_del include/linux/list.h:704 [inline]
BUG: KASAN: slab-out-of-bounds in hlist_del_init include/linux/list.h:717 [inline]
BUG: KASAN: slab-out-of-bounds in __xfrm_policy_unlink+0x9a4/0xa00 net/xfrm/xfrm_policy.c:2213
Write of size 8 at addr ffff88808fa4a3b0 by task kworker/u4:5/8187

CPU: 1 PID: 8187 Comm: kworker/u4:5 Not tainted 5.0.0-rc2+ #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:140
 __hlist_del include/linux/list.h:704 [inline]
 hlist_del_init include/linux/list.h:717 [inline]
 __xfrm_policy_unlink+0x9a4/0xa00 net/xfrm/xfrm_policy.c:2213
 xfrm_policy_flush+0x331/0x460 net/xfrm/xfrm_policy.c:1789
 xfrm_policy_fini+0xbf/0x640 net/xfrm/xfrm_policy.c:3866
 xfrm_net_exit+0x1d/0x70 net/xfrm/xfrm_policy.c:3928
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
 cleanup_net+0x51d/0xb10 net/core/net_namespace.c:551
 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 8575:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc mm/kasan/common.c:496 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469
 kasan_kmalloc mm/kasan/common.c:504 [inline]
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411
 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543
 getname_flags fs/namei.c:140 [inline]
 getname_flags+0xd6/0x5b0 fs/namei.c:129
 user_path_at_empty+0x2f/0x50 fs/namei.c:2608
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x129/0x210 fs/stat.c:185
 vfs_stat include/linux/fs.h:3170 [inline]
 __do_sys_newstat+0xa4/0x130 fs/stat.c:339
 __se_sys_newstat fs/stat.c:335 [inline]
 __x64_sys_newstat+0x54/0x80 fs/stat.c:335
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8575:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466
 __cache_free mm/slab.c:3487 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3749
 putname+0xef/0x130 fs/namei.c:261
 filename_lookup+0x359/0x530 fs/namei.c:2357
 user_path_at_empty+0x43/0x50 fs/namei.c:2608
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x129/0x210 fs/stat.c:185
 vfs_stat include/linux/fs.h:3170 [inline]
 __do_sys_newstat+0xa4/0x130 fs/stat.c:339
 __se_sys_newstat fs/stat.c:335 [inline]
 __x64_sys_newstat+0x54/0x80 fs/stat.c:335
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88808fa4ae80
 which belongs to the cache names_cache of size 4096
The buggy address is located 2768 bytes to the left of
 4096-byte region [ffff88808fa4ae80, ffff88808fa4be80)
The buggy address belongs to the page:
page:ffffea00023e9280 count:1 mapcount:0 mapping:ffff8880aa16adc0 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea0001a00288 ffffea00018c4608 ffff8880aa16adc0
raw: 0000000000000000 ffff88808fa4ae80 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808fa4a280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88808fa4a300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88808fa4a380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff88808fa4a400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88808fa4a480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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