==================================================================
BUG: KASAN: out-of-bounds in unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17
Read of size 8 at addr ffff8801b337f8f0 by task syz-executor2/7734

CPU: 0 PID: 7734 Comm: syz-executor2 Not tainted 4.9.82-gcdfc8df #37
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cf7278e8 ffffffff81d94fc9 ffffea0006ccdfc0 ffff8801b337f8f0
 0000000000000000 ffff8801b337f8f8 0000000000000000 ffff8801cf727920
 ffffffff8153e213 ffff8801b337f8f0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d94fc9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94fc9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153e213>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153e735>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153e735>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153e894>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d4db2>] unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17
 [<ffffffff8107c66d>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107c738>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c5a76>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c7248>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e92cf>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff8156c1c3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156ff5e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff81573c89>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff81573c89>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff81006505>] do_syscall_64+0x1a5/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b4e7d>] entry_SYSCALL_64_after_swapgs+0x47/0xc5

The buggy address belongs to the page:
page:ffffea0006ccdfc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b337f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801b337f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801b337f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                                ^
 ffff8801b337f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801b337f980: 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: 7734 Comm: syz-executor2 Tainted: G    B           4.9.82-gcdfc8df #37
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cf727840 ffffffff81d94fc9 ffffffff8419777f ffff8801cf727918
 0000000000000000 ffff8801b337f8f8 0000000000000000 ffff8801cf727908
 ffffffff8142f6c1 0000000041b58ab3 ffffffff8418b1f0 ffffffff8142f505
Call Trace:
 [<ffffffff81d94fc9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94fc9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142f6c1>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff8153e180>] kasan_end_report+0x50/0x50 mm/kasan/report.c:176
 [<ffffffff8153e627>] kasan_report_error mm/kasan/report.c:356 [inline]
 [<ffffffff8153e627>] kasan_report+0x167/0x360 mm/kasan/report.c:408
 [<ffffffff8153e894>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d4db2>] unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17
 [<ffffffff8107c66d>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107c738>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c5a76>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c7248>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e92cf>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff8156c1c3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156ff5e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff81573c89>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff81573c89>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff81006505>] do_syscall_64+0x1a5/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b4e7d>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..