R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000004d3160 R14: 00000000004c7de2 R15: 0000000000000002
kvm [28259]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc0010001 data 0x400000
kvm [28248]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc0010001 data 0x400000
==================================================================
BUG: KASAN: use-after-free in tls_fill_prepend include/net/tls.h:339 [inline]
BUG: KASAN: use-after-free in tls_push_record+0x1091/0x1400 net/tls/tls_sw.c:239
Write of size 1 at addr ffff8801d0360000 by task syz-executor4/28246

CPU: 1 PID: 28246 Comm: syz-executor4 Not tainted 4.18.0-rc7+ #171
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+0x1c9/0x2b4 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_store1_noabort+0x17/0x20 mm/kasan/report.c:435
 tls_fill_prepend include/net/tls.h:339 [inline]
 tls_push_record+0x1091/0x1400 net/tls/tls_sw.c:239
 tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:276
 tls_handle_open_record net/tls/tls_main.c:164 [inline]
 tls_sk_proto_close+0x74c/0xae0 net/tls/tls_main.c:264
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:459
 __sock_release+0xd7/0x260 net/socket.c:600
 sock_close+0x19/0x20 net/socket.c:1151
 __fput+0x355/0x8b0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:192 [inline]
 exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4105c1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 
RSP: 002b:0000000000a3feb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000014 RCX: 00000000004105c1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000013
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000a3fde0 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000159422 R14: 00000000000011c1 R15: badc0ffeebadface

The buggy address belongs to the page:
page:ffffea000740d800 count:0 mapcount:-128 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 ffffea0006a87a08 ffffea0006a03008 0000000000000000
raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d035ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d035ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d0360000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8801d0360080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801d0360100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================