bond0 (unregistering): Releasing backup interface bond_slave_0
bond0 (unregistering): Released all slaves
Disabling bearer <udp:syz0>
Left network mode
==================================================================
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 ffff88805529ecb0 by task kworker/u4:8/10239

CPU: 0 PID: 10239 Comm: kworker/u4:8 Not tainted 4.20.0+ #3
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:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:438
 __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 7986:
 save_stack+0x45/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc mm/kasan/kasan.c:553 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x700 mm/slab.c:3554
 getname_flags fs/namei.c:140 [inline]
 getname_flags+0xd6/0x5b0 fs/namei.c:129
 getname fs/namei.c:211 [inline]
 user_path_mountpoint_at+0x29/0x50 fs/namei.c:2747
 ksys_umount+0x198/0x1340 fs/namespace.c:1645
 __do_sys_umount fs/namespace.c:1671 [inline]
 __se_sys_umount fs/namespace.c:1669 [inline]
 __x64_sys_umount+0x54/0x80 fs/namespace.c:1669
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7986:
 save_stack+0x45/0xd0 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]
 kmem_cache_free+0x86/0x260 mm/slab.c:3760
 putname+0xef/0x130 fs/namei.c:261
 filename_mountpoint+0x337/0x490 fs/namei.c:2725
 user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2747
 ksys_umount+0x198/0x1340 fs/namespace.c:1645
 __do_sys_umount fs/namespace.c:1671 [inline]
 __se_sys_umount fs/namespace.c:1669 [inline]
 __x64_sys_umount+0x54/0x80 fs/namespace.c:1669
 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 ffff88805529ed80
 which belongs to the cache names_cache of size 4096
The buggy address is located 208 bytes to the left of
 4096-byte region [ffff88805529ed80, ffff88805529fd80)
The buggy address belongs to the page:
page:ffffea000154a780 count:1 mapcount:0 mapping:ffff88812c2bec40 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000155d188 ffffea000155d108 ffff88812c2bec40
raw: 0000000000000000 ffff88805529ed80 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88805529eb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805529ec00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805529ec80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff88805529ed00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805529ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================