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BUG: KASAN: stack-out-of-bounds in get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
BUG: KASAN: stack-out-of-bounds in __unwind_start+0x37c/0x3c0 arch/x86/kernel/unwind_frame.c:76
Read of size 8 at addr ffff8801d96e7a78 by task syz-executor559/3818

CPU: 0 PID: 3818 Comm: syz-executor559 Not tainted 4.9.96-g71fce1e #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d9317768 ffffffff81eb0b69 ffffea000765b9c0 ffff8801d96e7a78
 0000000000000000 ffff8801d96e7a78 ffff8801d93178a0 ffff8801d93177a0
 ffffffff8156540b ffff8801d96e7a78 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8156540b>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff81565815>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff81565815>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff81539494>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 [<ffffffff810d11ec>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d11ec>] __unwind_start+0x37c/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107ada9>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107ada9>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107aea8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816d5378>] proc_pid_stack+0x148/0x220 fs/proc/base.c:467
 [<ffffffff816d681d>] proc_single_show+0xfd/0x170 fs/proc/base.c:769
 [<ffffffff815e7973>] traverse+0x363/0x920 fs/seq_file.c:124
 [<ffffffff815eb279>] seq_read+0xd19/0x12e0 fs/seq_file.c:195
 [<ffffffff8156e725>] __vfs_read+0x115/0x570 fs/read_write.c:449
 [<ffffffff8156fef0>] vfs_read+0x120/0x380 fs/read_write.c:472
 [<ffffffff81574335>] SYSC_pread64 fs/read_write.c:626 [inline]
 [<ffffffff81574335>] SyS_pread64+0x145/0x170 fs/read_write.c:613
 [<ffffffff81118ac9>] sys32_pread+0x39/0x50 arch/x86/ia32/sys_ia32.c:179
 [<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
 [<ffffffff839f4a10>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

The buggy address belongs to the page:
page:ffffea000765b9c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d96e7900: f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d96e7980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d96e7a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f2 f2
                                                                ^
 ffff8801d96e7a80: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d96e7b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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