protocol 88fb is buggy, dev hsr_slave_0
==================================================================
BUG: KASAN: use-after-free in inet_ctl_sock_destroy include/net/inet_common.h:56 [inline]
BUG: KASAN: use-after-free in icmp_sk_exit+0x1ce/0x1f0 net/ipv4/icmp.c:1187
Read of size 8 at addr ffff888048f55968 by task kworker/u4:3/12005

CPU: 0 PID: 12005 Comm: kworker/u4:3 Not tainted 5.0.0-rc7+ #83
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+0x172/0x1f0 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_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 inet_ctl_sock_destroy include/net/inet_common.h:56 [inline]
 icmp_sk_exit+0x1ce/0x1f0 net/ipv4/icmp.c:1187
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 7598:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:509
 __do_kmalloc_node mm/slab.c:3678 [inline]
 __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3692
 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:140
 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:208
 alloc_skb_fclone include/linux/skbuff.h:1053 [inline]
 sk_stream_alloc_skb+0xc8/0x860 net/ipv4/tcp.c:874
 tcp_sendmsg_locked+0xc7d/0x34a0 net/ipv4/tcp.c:1286
 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1443
 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xdd/0x130 net/socket.c:631
 sock_write_iter+0x27c/0x3e0 net/socket.c:900
 call_write_iter include/linux/fs.h:1863 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x613/0x8e0 fs/read_write.c:487
 vfs_write+0x20c/0x580 fs/read_write.c:549
 ksys_write+0xea/0x1f0 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7598:
 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:457
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465
 __cache_free mm/slab.c:3494 [inline]
 kfree+0xcf/0x230 mm/slab.c:3811
 skb_free_head+0x93/0xb0 net/core/skbuff.c:557
 skb_release_data+0x57e/0x7b0 net/core/skbuff.c:577
 skb_release_all+0x4d/0x60 net/core/skbuff.c:631
 __kfree_skb+0x16/0x30 net/core/skbuff.c:645
 sk_wmem_free_skb include/net/sock.h:1462 [inline]
 tcp_rtx_queue_unlink_and_free include/net/tcp.h:1762 [inline]
 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3141 [inline]
 tcp_ack+0x1c65/0x5310 net/ipv4/tcp_input.c:3668
 tcp_rcv_established+0x18d9/0x1fb0 net/ipv4/tcp_input.c:5573
 tcp_v4_do_rcv+0x616/0x8d0 net/ipv4/tcp_ipv4.c:1541
 sk_backlog_rcv include/net/sock.h:936 [inline]
 __release_sock+0x12e/0x3a0 net/core/sock.c:2284
 release_sock+0x59/0x1c0 net/core/sock.c:2800
 tcp_sendmsg+0x3b/0x50 net/ipv4/tcp.c:1444
 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xdd/0x130 net/socket.c:631
 sock_write_iter+0x27c/0x3e0 net/socket.c:900
 call_write_iter include/linux/fs.h:1863 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x613/0x8e0 fs/read_write.c:487
 vfs_write+0x20c/0x580 fs/read_write.c:549
 ksys_write+0xea/0x1f0 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888048f55740
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 552 bytes inside of
 2048-byte region [ffff888048f55740, ffff888048f55f40)
The buggy address belongs to the page:
page:ffffea000123d500 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea00025eb988 ffffea000259a988 ffff88812c3f0c40
raw: 0000000000000000 ffff888048f54640 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888048f55800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888048f55880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888048f55900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff888048f55980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888048f55a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================