TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
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BUG: KASAN: out-of-bounds in unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17
Read of size 8 at addr ffff8801be7578d0 by task syz-executor5/5322

CPU: 1 PID: 5322 Comm: syz-executor5 Not tainted 4.9.86-g00db063 #60
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801b321f7c0 ffffffff81d956f9 ffffea0006f9d5c0 ffff8801be7578d0
 0000000000000000 ffff8801be7578d8 0000000000000000 ffff8801b321f7f8
 ffffffff8153e083 ffff8801be7578d0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d956f9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956f9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153e083>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153e5a5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153e5a5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153e704>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d4db2>] unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17
 [<ffffffff8107c66d>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107c738>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c5a66>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c7238>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e92bf>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff8156cb98>] do_loop_readv_writev.part.17+0xc8/0x2b0 fs/read_write.c:715
 [<ffffffff81571d7f>] do_loop_readv_writev fs/read_write.c:1097 [inline]
 [<ffffffff81571d7f>] compat_do_readv_writev+0x5ff/0x740 fs/read_write.c:1091
 [<ffffffff81571fa3>] compat_readv+0xe3/0x150 fs/read_write.c:1120
 [<ffffffff81572104>] do_compat_readv+0xf4/0x1d0 fs/read_write.c:1140
 [<ffffffff81574676>] C_SYSC_readv fs/read_write.c:1152 [inline]
 [<ffffffff81574676>] compat_SyS_readv+0x26/0x30 fs/read_write.c:1148
 [<ffffffff81006f95>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006f95>] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
 [<ffffffff838b6d10>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

The buggy address belongs to the page:
page:ffffea0006f9d5c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801be757780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801be757800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801be757880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                    ^
 ffff8801be757900: 00 00 f1 f1 f1 f1 00 f2 f2 f2 f3 f3 f3 f3 00 00
 ffff8801be757980: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1
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