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BUG: KASAN: use-after-free in rxrpc_send_keepalive+0xe2/0x3c0 net/rxrpc/output.c:634
Read of size 8 at addr ffff88808eed7018 by task kworker/0:3/7748

CPU: 0 PID: 7748 Comm: kworker/0:3 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krxrpcd rxrpc_peer_keepalive_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113
 print_address_description+0x75/0x5c0 mm/kasan/report.c:374
 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:506
 kasan_report+0x26/0x50 mm/kasan/common.c:634
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 rxrpc_send_keepalive+0xe2/0x3c0 net/rxrpc/output.c:634
 rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:369 [inline]
 rxrpc_peer_keepalive_worker+0x76e/0xb40 net/rxrpc/peer_event.c:430
 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269
 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 7802:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:510
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
 kmem_cache_alloc_trace+0x221/0x2f0 mm/slab.c:3550
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:690 [inline]
 rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
 rxrpc_lookup_local+0x708/0x16f0 net/rxrpc/local_object.c:277
 rxrpc_sendmsg+0x493/0x8b0 net/rxrpc/af_rxrpc.c:566
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg net/socket.c:657 [inline]
 ___sys_sendmsg+0x60d/0x910 net/socket.c:2311
 __sys_sendmmsg+0x239/0x470 net/socket.c:2413
 __do_sys_sendmmsg net/socket.c:2442 [inline]
 __se_sys_sendmmsg net/socket.c:2439 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2439
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7817:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:471
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x115/0x200 mm/slab.c:3756
 rxrpc_local_rcu+0x63/0x80 net/rxrpc/local_object.c:499
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2157 [inline]
 rcu_core+0x843/0x1050 kernel/rcu/tree.c:2377
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2386
 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:766

The buggy address belongs to the object at ffff88808eed7000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 24 bytes inside of
 1024-byte region [ffff88808eed7000, ffff88808eed7400)
The buggy address belongs to the page:
page:ffffea00023bb5c0 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff88808eed7000
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00028d2ac8 ffffea000246a208 ffff8880aa400c40
raw: ffff88808eed7000 ffff88808eed7000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808eed6f00: fc fc fc fc fb fb fb fb fb fb fb fc fc fc fc fb
 ffff88808eed6f80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>ffff88808eed7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88808eed7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808eed7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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