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BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:221 [inline]
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:748 [inline]
BUG: KASAN: use-after-free in hlist_del_rcu include/linux/rculist.h:455 [inline]
BUG: KASAN: use-after-free in __xfrm_policy_unlink+0x4b1/0x5c0 net/xfrm/xfrm_policy.c:2217
Write of size 8 at addr ffff8880a064e180 by task syz-executor.5/6069

CPU: 0 PID: 6069 Comm: syz-executor.5 Not tainted 5.2.0-rc5+ #45
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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:188
 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 kasan_report+0x12/0x20 mm/kasan/common.c:614
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137
 __write_once_size include/linux/compiler.h:221 [inline]
 __hlist_del include/linux/list.h:748 [inline]
 hlist_del_rcu include/linux/rculist.h:455 [inline]
 __xfrm_policy_unlink+0x4b1/0x5c0 net/xfrm/xfrm_policy.c:2217
 xfrm_policy_flush+0x331/0x460 net/xfrm/xfrm_policy.c:1794
 xfrm_flush_policy+0x166/0x300 net/xfrm/xfrm_user.c:2123
 xfrm_user_rcv_msg+0x459/0x770 net/xfrm/xfrm_user.c:2657
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2665
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x531/0x710 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:665
 ___sys_sendmsg+0x803/0x920 net/socket.c:2286
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2324
 __do_sys_sendmsg net/socket.c:2333 [inline]
 __se_sys_sendmsg net/socket.c:2331 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2331
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459519
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f29b3dc8c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f29b3dc96d4
R13: 00000000004c7264 R14: 00000000004dc6c8 R15: 00000000ffffffff

Allocated by task 8817:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503
 kmem_cache_alloc_trace+0x151/0x750 mm/slab.c:3555
 kmalloc include/linux/slab.h:547 [inline]
 sock_alloc_inode+0x63/0x260 net/socket.c:249
 alloc_inode+0x68/0x1e0 fs/inode.c:227
 new_inode_pseudo+0x19/0xf0 fs/inode.c:916
 sock_alloc+0x41/0x270 net/socket.c:569
 __sock_create+0xc2/0x730 net/socket.c:1388
 sock_create net/socket.c:1475 [inline]
 __sys_socket+0x103/0x220 net/socket.c:1517
 __do_sys_socket net/socket.c:1526 [inline]
 __se_sys_socket net/socket.c:1524 [inline]
 __x64_sys_socket+0x73/0xb0 net/socket.c:1524
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 27234:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459
 __cache_free mm/slab.c:3432 [inline]
 kfree+0xcf/0x220 mm/slab.c:3755
 __rcu_reclaim kernel/rcu/rcu.h:215 [inline]
 rcu_do_batch kernel/rcu/tree.c:2092 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2310 [inline]
 rcu_core+0xcc7/0x1500 kernel/rcu/tree.c:2291
 __do_softirq+0x25c/0x94c kernel/softirq.c:292

The buggy address belongs to the object at ffff8880a064e180
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 0 bytes inside of
 128-byte region [ffff8880a064e180, ffff8880a064e200)
The buggy address belongs to the page:
page:ffffea0002819380 refcount:1 mapcount:0 mapping:ffff8880aa400640 index:0xffff8880a064e480
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002815308 ffffea0002a11cc8 ffff8880aa400640
raw: ffff8880a064e480 ffff8880a064e000 000000010000000e 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a064e080: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8880a064e100: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff8880a064e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8880a064e200: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8880a064e280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
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