==================================================================
BUG: KASAN: out-of-bounds in get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
BUG: KASAN: out-of-bounds in __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
Read of size 8 at addr ffff8801cd6cfc30 by task syz-executor2/10025

CPU: 0 PID: 10025 Comm: syz-executor2 Not tainted 4.9.71-g2506378 #113
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cc8778f0 ffffffff81d922b9 ffffea000735b3c0 ffff8801cd6cfc30
 0000000000000000 ffff8801cd6cfc38 ffff8801cc877a20 ffff8801cc877928
 ffffffff8153bab3 ffff8801cd6cfc30 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d922b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d922b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153bab3>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153bfd5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153bfd5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d41c7>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d41c7>] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107c4c9>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107c4c9>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107c5c8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c2e66>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c4638>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e676f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff81569903>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156d69e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff815713c9>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff815713c9>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff838aef85>] entry_SYSCALL_64_fastpath+0x23/0xc6

The buggy address belongs to the page:
page:ffffea000735b3c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cd6cfb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cd6cfb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801cd6cfc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff8801cd6cfc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cd6cfd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 10025 Comm: syz-executor2 Tainted: G    B           4.9.71-g2506378 #113
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cc877848 ffffffff81d922b9 ffffffff84194b3f ffff8801cc877920
 0000000000000000 ffff8801cd6cfc38 ffff8801cc877a20 ffff8801cc877910
 ffffffff8142d741 0000000041b58ab3 ffffffff84188580 ffffffff8142d585
Call Trace:
 [<ffffffff81d922b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d922b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142d741>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff8153ba20>] kasan_end_report+0x50/0x50 mm/kasan/report.c:176
 [<ffffffff8153bec7>] kasan_report_error mm/kasan/report.c:356 [inline]
 [<ffffffff8153bec7>] kasan_report+0x167/0x360 mm/kasan/report.c:408
 [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d41c7>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d41c7>] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107c4c9>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107c4c9>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107c5c8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c2e66>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c4638>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e676f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff81569903>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156d69e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff815713c9>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff815713c9>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff838aef85>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..