netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'.
==================================================================
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 ffff8801cd4578d8 by task syz-executor0/15987

CPU: 1 PID: 15987 Comm: syz-executor0 Not tainted 4.9.111-g03c70fe #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801b914f7b8 ffffffff81eb2729 ffffea00073515c0 ffff8801cd4578d8
 0000000000000000 ffff8801cd4578e0 ffff8801b4acc780 ffff8801b914f7f0
 ffffffff81567b59 ffff8801cd4578d8 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81eb2729>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb2729>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81567b59>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff81567f63>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff81567f63>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff8153bbb4>] __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
 [<ffffffff8107b9bd>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107ba88>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816d7c88>] proc_pid_stack+0x148/0x220 fs/proc/base.c:469
 [<ffffffff816d937d>] proc_single_show+0xfd/0x170 fs/proc/base.c:771
 [<ffffffff815ed386>] seq_read+0x4b6/0x12e0 fs/seq_file.c:240
 [<ffffffff8156f3e5>] do_loop_readv_writev.part.18+0xd5/0x280 fs/read_write.c:718
 [<ffffffff81574597>] do_loop_readv_writev fs/read_write.c:707 [inline]
 [<ffffffff81574597>] compat_do_readv_writev+0x567/0x7a0 fs/read_write.c:1091
 [<ffffffff815748b2>] compat_readv+0xe2/0x150 fs/read_write.c:1120
 [<ffffffff81574c42>] do_compat_preadv64+0x152/0x180 fs/read_write.c:1169
 [<ffffffff815771db>] C_SYSC_preadv fs/read_write.c:1189 [inline]
 [<ffffffff815771db>] compat_SyS_preadv+0x3b/0x50 fs/read_write.c:1183
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839fa3d0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

The buggy address belongs to the page:
page:ffffea00073515c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cd457780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cd457800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801cd457880: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2
                                                       ^
 ffff8801cd457900: f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
 ffff8801cd457980: 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2
==================================================================