==================================================================
BUG: KASAN: use-after-free in __rxrpc_put_peer net/rxrpc/peer_object.c:411 [inline]
BUG: KASAN: use-after-free in rxrpc_put_peer+0x685/0x6a0 net/rxrpc/peer_object.c:435
Read of size 8 at addr ffff888098fabb58 by task udevd/9655

CPU: 0 PID: 9655 Comm: udevd Not tainted 5.3.0-rc6+ #121
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351
 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
 kasan_report+0x12/0x17 mm/kasan/common.c:618
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 __rxrpc_put_peer net/rxrpc/peer_object.c:411 [inline]
 rxrpc_put_peer+0x685/0x6a0 net/rxrpc/peer_object.c:435
 rxrpc_rcu_destroy_call+0x5e/0x140 net/rxrpc/call_object.c:558
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2114 [inline]
 rcu_core+0x67f/0x1580 kernel/rcu/tree.c:2314
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2323
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:95
Code: 89 25 44 4e 19 09 41 bc f4 ff ff ff e8 5d 9f e9 ff 48 c7 05 2e 4e 19 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 65 48 8b 04 25 40 fe 01 00 65 8b 15 14 8a 8f 7e 81 e2
RSP: 0018:ffff8880871cf4b8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff833e12de
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff8880871cf4e0 R08: ffff88808d026240 R09: ffff8880871cf5d8
R10: ffff8880871cf5a8 R11: ffff8880871cf5b8 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88808d026240 R15: ffff88821bc42700
 rcu_dynticks_curr_cpu_in_eqs+0x17/0xb0 kernel/rcu/tree.c:298
 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:894
 kernel_text_address+0x5b/0xf0 kernel/extable.c:128
 __kernel_text_address+0xd/0x40 kernel/extable.c:95
 unwind_get_return_address arch/x86/kernel/unwind_frame.c:19 [inline]
 unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:14
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xac/0xe0 kernel/stacktrace.c:123
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:493 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:501
 slab_post_alloc_hook mm/slab.h:520 [inline]
 slab_alloc mm/slab.c:3319 [inline]
 kmem_cache_alloc+0x121/0x710 mm/slab.c:3483
 anon_vma_chain_alloc mm/rmap.c:129 [inline]
 anon_vma_clone+0xde/0x480 mm/rmap.c:269
 anon_vma_fork+0x8f/0x4a0 mm/rmap.c:332
 dup_mmap kernel/fork.c:547 [inline]
 dup_mm+0xa47/0x1430 kernel/fork.c:1346
 copy_mm kernel/fork.c:1402 [inline]
 copy_process+0x28b7/0x6b00 kernel/fork.c:2017
 _do_fork+0x146/0xfa0 kernel/fork.c:2369
 __do_sys_clone kernel/fork.c:2524 [inline]
 __se_sys_clone kernel/fork.c:2505 [inline]
 __x64_sys_clone+0x18d/0x250 kernel/fork.c:2505
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f047c776f46
Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00
RSP: 002b:00007ffdf6f05d90 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffdf6f05d90 RCX: 00007f047c776f46
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffdf6f05df0 R08: 00000000000025b7 R09: 00000000000025b7
R10: 00007f047d093a70 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdf6f05db0 R14: 0000000000000005 R15: 0000000000000005

Allocated by task 14506:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:493 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:466
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:507
 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:748 [inline]
 rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
 rxrpc_lookup_local+0x562/0x1ba0 net/rxrpc/local_object.c:277
 rxrpc_sendmsg+0x379/0x5f0 net/rxrpc/af_rxrpc.c:566
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:657
 ___sys_sendmsg+0x803/0x920 net/socket.c:2311
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2356
 __do_sys_sendmsg net/socket.c:2365 [inline]
 __se_sys_sendmsg net/socket.c:2363 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2363
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 23234:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:455
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:463
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3756
 rxrpc_local_rcu+0x62/0x80 net/rxrpc/local_object.c:496
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2114 [inline]
 rcu_core+0x67f/0x1580 kernel/rcu/tree.c:2314
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2323
 __do_softirq+0x262/0x98c kernel/softirq.c:292

The buggy address belongs to the object at ffff888098fabb40
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 24 bytes inside of
 1024-byte region [ffff888098fabb40, ffff888098fabf40)
The buggy address belongs to the page:
page:ffffea000263ea80 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff888098fab6c0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea0002759a08 ffffea0002211188 ffff8880aa400c40
raw: ffff888098fab6c0 ffff888098faa040 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888098faba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888098faba80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888098fabb00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                    ^
 ffff888098fabb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888098fabc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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