device lo left promiscuous mode
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BUG: KASAN: out-of-bounds in unwind_get_return_address+0x98/0xb0 arch/x86/kernel/unwind_frame.c:17
Read of size 8 at addr ffff8801b7ecf8e8 by task syz-executor4/19182

CPU: 0 PID: 19182 Comm: syz-executor4 Not tainted 4.9.105-gd7e64f8 #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d38277c8 ffffffff81eb41a9 ffffea0006dfb3c0 ffff8801b7ecf8e8
 0000000000000000 ffff8801b7ecf8f0 ffff8801cdded3c0 ffff8801d3827800
 ffffffff81567e49 ffff8801b7ecf8e8 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81eb41a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb41a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81567e49>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff81568253>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff81568253>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff8153bea4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 [<ffffffff810d2c08>] unwind_get_return_address+0x98/0xb0 arch/x86/kernel/unwind_frame.c:17
 [<ffffffff8107b9ed>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107bab8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816d7fe8>] proc_pid_stack+0x148/0x220 fs/proc/base.c:469
 [<ffffffff816d96dd>] proc_single_show+0xfd/0x170 fs/proc/base.c:771
 [<ffffffff815ed676>] seq_read+0x4b6/0x12e0 fs/seq_file.c:240
 [<ffffffff8156f6d5>] do_loop_readv_writev.part.18+0xd5/0x280 fs/read_write.c:718
 [<ffffffff81573625>] do_loop_readv_writev fs/read_write.c:707 [inline]
 [<ffffffff81573625>] do_readv_writev+0x565/0x7a0 fs/read_write.c:873
 [<ffffffff815738e4>] vfs_readv+0x84/0xc0 fs/read_write.c:897
 [<ffffffff81573d17>] do_preadv+0x197/0x240 fs/read_write.c:974
 [<ffffffff815772d0>] SYSC_preadv fs/read_write.c:1024 [inline]
 [<ffffffff815772d0>] SyS_preadv+0x30/0x40 fs/read_write.c:1019
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the page:
page:ffffea0006dfb3c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b7ecf780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801b7ecf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801b7ecf880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                             ^
 ffff8801b7ecf900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801b7ecf980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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