==================================================================
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+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
Read of size 8 at addr ffff8801c880f8b8 by task syzkaller958067/3319

CPU: 1 PID: 3319 Comm: syzkaller958067 Not tainted 4.9.75-g5f5e5d4 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c8827900 ffffffff81d93049 ffffea00072203c0 ffff8801c880f8b8
 0000000000000000 ffff8801c880f8b8 ffff8801c8827a30 ffff8801c8827938
 ffffffff8153ca53 ffff8801c880f8b8 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d93049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153ca53>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153cf75>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153cf75>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d4397>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d4397>] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107c5b9>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107c5b9>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107c6b8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c3e06>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c55d8>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e770f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff8156a8a3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156e63e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff8157272f>] SYSC_pread64 fs/read_write.c:629 [inline]
 [<ffffffff8157272f>] SyS_pread64+0x13f/0x170 fs/read_write.c:616
 [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2

The buggy address belongs to the page:
page:ffffea00072203c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c880f780: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c880f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c880f880: 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2
                                        ^
 ffff8801c880f900: f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2
 ffff8801c880f980: f2 f2 00 00 00 00 00 f2 f2 f2 f2 f2 f2 f2 00 00
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3319 Comm: syzkaller958067 Tainted: G    B           4.9.75-g5f5e5d4 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c8827858 ffffffff81d93049 ffffffff84195be7 ffff8801c8827930
 0000000000000000 ffff8801c880f8b8 ffff8801c8827a30 ffff8801c8827920
 ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5
Call Trace:
 [<ffffffff81d93049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142e281>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff8153c9c0>] kasan_end_report+0x50/0x50 mm/kasan/report.c:176
 [<ffffffff8153ce67>] kasan_report_error mm/kasan/report.c:356 [inline]
 [<ffffffff8153ce67>] kasan_report+0x167/0x360 mm/kasan/report.c:408
 [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d4397>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d4397>] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107c5b9>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107c5b9>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107c6b8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c3e06>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c55d8>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e770f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff8156a8a3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156e63e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff8157272f>] SYSC_pread64 fs/read_write.c:629 [inline]
 [<ffffffff8157272f>] SyS_pread64+0x13f/0x170 fs/read_write.c:616
 [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..