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BUG: KASAN: out-of-bounds in unwind_next_frame+0xd7/0xe0 arch/x86/kernel/unwind_frame.c:51
Read of size 8 at addr ffff8801d1b5f8e0 by task syz-executor3/12864

CPU: 1 PID: 12864 Comm: syz-executor3 Not tainted 4.9.77-g033d019 #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d02878a0 ffffffff81d941c9 ffffea000746d7c0 ffff8801d1b5f8e0
 0000000000000000 ffff8801d1b5f8e8 0000000000000000 ffff8801d02878d8
 ffffffff8153db93 ffff8801d1b5f8e0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d941c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d941c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153db93>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153e0b5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153e0b5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153e214>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d4fe7>] unwind_next_frame+0xd7/0xe0 arch/x86/kernel/unwind_frame.c:51
 [<ffffffff8107c6ad>] __save_stack_trace+0x7d/0xf0 arch/x86/kernel/stacktrace.c:42
 [<ffffffff8107c788>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c4f46>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c6718>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e884f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff8156b9e3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156f77e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff8157386f>] SYSC_pread64 fs/read_write.c:629 [inline]
 [<ffffffff8157386f>] SyS_pread64+0x13f/0x170 fs/read_write.c:616
 [<ffffffff8111cee9>] sys32_pread+0x39/0x50 arch/x86/ia32/sys_ia32.c:179
 [<ffffffff81006fc7>] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline]
 [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384
 [<ffffffff838b43f4>] entry_SYSENTER_compat+0x74/0x83 arch/x86/entry/entry_64_compat.S:127

The buggy address belongs to the page:
page:ffffea000746d7c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d1b5f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d1b5f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d1b5f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                          ^
 ffff8801d1b5f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d1b5f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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