random: crng init done
==================================================================
BUG: KASAN: use-after-free in xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:205 [inline]
BUG: KASAN: use-after-free in xfrm6_tunnel_destroy+0x4f6/0x570 net/ipv6/xfrm6_tunnel.c:300
Read of size 8 at addr ffff8801d64f07f8 by task kworker/1:3/2098

CPU: 1 PID: 2098 Comm: kworker/1:3 Not tainted 4.9.148+ #3
Workqueue: events xfrm_state_gc_task
 ffff8801ce57fa60 ffffffff81b456e1 0000000000000000 ffffea0007593c00
 ffff8801d64f07f8 0000000000000008 ffffffff82773406 ffff8801ce57fa98
 ffffffff815020d5 0000000000000000 ffff8801d64f07f8 ffff8801d64f07f8
Call Trace:
 [<ffffffff81b456e1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b456e1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff815020d5>] print_address_description+0x6f/0x238 mm/kasan/report.c:256
 [<ffffffff8150232a>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff8150232a>] kasan_report mm/kasan/report.c:412 [inline]
 [<ffffffff8150232a>] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:397
 [<ffffffff814f4524>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 [<ffffffff82773406>] xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:205 [inline]
 [<ffffffff82773406>] xfrm6_tunnel_destroy+0x4f6/0x570 net/ipv6/xfrm6_tunnel.c:300
 [<ffffffff82645299>] xfrm_state_gc_destroy net/xfrm/xfrm_state.c:368 [inline]
 [<ffffffff82645299>] xfrm_state_gc_task+0x3b9/0x520 net/xfrm/xfrm_state.c:388
 [<ffffffff8113003b>] process_one_work+0x88b/0x15c0 kernel/workqueue.c:2092
 [<ffffffff8113134f>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2226
 [<ffffffff81141e38>] kthread+0x278/0x310 kernel/kthread.c:211
 [<ffffffff8281355c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Allocated by task 2060:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack mm/kasan/kasan.c:505 [inline]
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:609
 kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:594
 __kmalloc+0x133/0x320 mm/slub.c:3741
 kmalloc include/linux/slab.h:495 [inline]
 kzalloc include/linux/slab.h:636 [inline]
 ops_init+0xf1/0x3a0 net/core/net_namespace.c:101
 setup_net+0x1b4/0x4e0 net/core/net_namespace.c:291
 copy_net_ns+0x191/0x340 net/core/net_namespace.c:408
 create_new_namespaces+0x37c/0x7a0 kernel/nsproxy.c:106
 unshare_nsproxy_namespaces+0xab/0x1e0 kernel/nsproxy.c:205
 SYSC_unshare kernel/fork.c:2263 [inline]
 SyS_unshare+0x305/0x6f0 kernel/fork.c:2213
 do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Freed by task 64:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack mm/kasan/kasan.c:505 [inline]
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:582
 slab_free_hook mm/slub.c:1355 [inline]
 slab_free_freelist_hook mm/slub.c:1377 [inline]
 slab_free mm/slub.c:2958 [inline]
 kfree+0xfb/0x310 mm/slub.c:3878
 ops_free net/core/net_namespace.c:126 [inline]
 ops_free_list.part.0+0x1ff/0x330 net/core/net_namespace.c:148
 ops_free_list net/core/net_namespace.c:146 [inline]
 cleanup_net+0x474/0x8a0 net/core/net_namespace.c:477
 process_one_work+0x88b/0x15c0 kernel/workqueue.c:2092
 worker_thread+0x5df/0x11d0 kernel/workqueue.c:2226
 kthread+0x278/0x310 kernel/kthread.c:211
 ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

The buggy address belongs to the object at ffff8801d64f0000
 which belongs to the cache kmalloc-8192 of size 8192
The buggy address is located 2040 bytes inside of
 8192-byte region [ffff8801d64f0000, ffff8801d64f2000)
The buggy address belongs to the page:
page:ffffea0007593c00 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
flags: 0x4000000000004080(slab|head)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d64f0680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801d64f0700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801d64f0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff8801d64f0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801d64f0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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