==================================================================
BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:264 [inline]
BUG: KASAN: use-after-free in rhashtable_last_table+0x10b/0x130 lib/rhashtable.c:156
Read of size 8 at addr ffff8801cbae0038 by task kworker/0:2/351

CPU: 0 PID: 351 Comm: kworker/0:2 Not tainted 4.9.190+ #1
Workqueue: events rht_deferred_worker
 ffff8801d5197a50 ffffffff81b66c51 0000000000000000 ffffea00072eb800
 ffff8801cbae0038 0000000000000008 ffffffff81bba6fb ffff8801d5197a88
 ffffffff8150c161 0000000000000000 ffff8801cbae0038 ffff8801cbae0038
Call Trace:
 [<00000000366d4e6b>] __dump_stack lib/dump_stack.c:15 [inline]
 [<00000000366d4e6b>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000d94d9b40>] print_address_description+0x6f/0x23a mm/kasan/report.c:256
 [<000000003e5e3910>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<000000003e5e3910>] kasan_report mm/kasan/report.c:413 [inline]
 [<000000003e5e3910>] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:397
 [<00000000c20a3c38>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:434
 [<000000004f9d0ce3>] __read_once_size include/linux/compiler.h:264 [inline]
 [<000000004f9d0ce3>] rhashtable_last_table+0x10b/0x130 lib/rhashtable.c:156
 [<000000001bf0f0ab>] rht_deferred_worker+0x83/0x1a10 lib/rhashtable.c:368
 [<0000000046b1ed15>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 [<0000000016a67919>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 [<000000003525e7b3>] kthread+0x278/0x310 kernel/kthread.c:211
 [<000000008ff70df4>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375

Allocated by task 23:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack mm/kasan/kasan.c:512 [inline]
 set_track mm/kasan/kasan.c:524 [inline]
 kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616
 kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601
 __kmalloc+0x133/0x320 mm/slub.c:3741
 kmalloc include/linux/slab.h:495 [inline]
 kzalloc include/linux/slab.h:636 [inline]
 bucket_table_alloc+0x31e/0x400 lib/rhashtable.c:126
 rhashtable_expand lib/rhashtable.c:300 [inline]
 rht_deferred_worker+0x1e6/0x1a10 lib/rhashtable.c:371
 process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 kthread+0x278/0x310 kernel/kthread.c:211
 ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375

Freed by task 5344:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack mm/kasan/kasan.c:512 [inline]
 set_track mm/kasan/kasan.c:524 [inline]
 kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:589
 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+0xfc/0x310 mm/slub.c:3878
 kvfree+0x4d/0x60 mm/util.c:356
 bucket_table_free+0x4b/0x60 lib/rhashtable.c:107
 rhashtable_free_and_destroy+0x1b3/0x630 lib/rhashtable.c:1010
 inet_frags_exit_net+0x3d/0x50 net/ipv4/inet_fragment.c:151
 ipv4_frags_exit_net+0x73/0x90 net/ipv4/ip_fragment.c:697
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136
 cleanup_net+0x3d6/0x8a0 net/core/net_namespace.c:474
 process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 kthread+0x278/0x310 kernel/kthread.c:211
 ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375

The buggy address belongs to the object at ffff8801cbae0000
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 56 bytes inside of
 4096-byte region [ffff8801cbae0000, ffff8801cbae1000)
The buggy address belongs to the page:
page:ffffea00072eb800 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
flags: 0x4000000000010200(slab|head)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cbadff00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8801cbadff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801cbae0000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8801cbae0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cbae0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================