TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
==================================================================
BUG: KASAN: use-after-free in list_replace include/linux/list.h:141 [inline]
BUG: KASAN: use-after-free in list_replace_init include/linux/list.h:149 [inline]
BUG: KASAN: use-after-free in padata_serial_worker+0x362/0x400 kernel/padata.c:296
Write of size 8 at addr ffff88809fb0e198 by task kworker/1:0/18

CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.124 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_serial_worker
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435
 list_replace include/linux/list.h:141 [inline]
 list_replace_init include/linux/list.h:149 [inline]
 padata_serial_worker+0x362/0x400 kernel/padata.c:296
 process_one_work+0x863/0x1600 kernel/workqueue.c:2114
 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 18231:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15d/0x7a0 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 tls_push_record+0x10a/0x1210 net/tls/tls_sw.c:250
 tls_sw_sendmsg+0x9e8/0x1020 net/tls/tls_sw.c:457
 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 SYSC_sendto+0x206/0x310 net/socket.c:1763
 SyS_sendto+0x40/0x50 net/socket.c:1731
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 18231:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xcc/0x270 mm/slab.c:3815
 tls_push_record+0xc03/0x1210 net/tls/tls_sw.c:293
 tls_sw_sendmsg+0x9e8/0x1020 net/tls/tls_sw.c:457
 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 SYSC_sendto+0x206/0x310 net/socket.c:1763
 SyS_sendto+0x40/0x50 net/socket.c:1731
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff88809fb0e140
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 88 bytes inside of
 256-byte region [ffff88809fb0e140, ffff88809fb0e240)
The buggy address belongs to the page:
page:ffffea00027ec380 count:1 mapcount:0 mapping:ffff88809fb0e000 index:0xffff88809fb0ea00
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff88809fb0e000 ffff88809fb0ea00 000000010000000b
raw: ffffea0001f46020 ffffea00017919e0 ffff8880aa8007c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809fb0e080: 00 00 00 00 00 00 00 00 00 04 fc fc fc fc fc fc
 ffff88809fb0e100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff88809fb0e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88809fb0e200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809fb0e280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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