==================================================================
BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17
Read of size 8 at addr ffff8801c7eb7e50 by task syz-executor6/11724

CPU: 1 PID: 11724 Comm: syz-executor6 Not tainted 4.9.74-g173c52e #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ce16f940 ffffffff81d91b09 ffffea00071fadc0 ffff8801c7eb7e50
 0000000000000000 ffff8801c7eb7e50 0000000000000000 ffff8801ce16f978
 ffffffff8153b503 ffff8801c7eb7e50 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d91b09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d91b09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153b503>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153ba25>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153ba25>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153bb84>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d3be2>] unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17
 [<ffffffff8107c4fd>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107c5c8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c28b6>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c4088>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e61bf>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff81569353>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156d0ee>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff81570e19>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff81570e19>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff838afa85>] entry_SYSCALL_64_fastpath+0x23/0xc6

The buggy address belongs to the page:
page:ffffea00071fadc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c7eb7d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c7eb7d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1
>ffff8801c7eb7e00: f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2
                                                 ^
 ffff8801c7eb7e80: f2 00 00 f2 f2 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c7eb7f00: 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: 1 PID: 11724 Comm: syz-executor6 Tainted: G    B           4.9.74-g173c52e #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ce16f898 ffffffff81d91b09 ffffffff841955df ffff8801ce16f970
 0000000000000000 ffff8801c7eb7e50 0000000000000000 ffff8801ce16f960
 ffffffff8142d161 0000000041b58ab3 ffffffff84189020 ffffffff8142cfa5
Call Trace:
 [<ffffffff81d91b09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d91b09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142d161>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff8153b470>] kasan_end_report+0x50/0x50 mm/kasan/report.c:176
 [<ffffffff8153b917>] kasan_report_error mm/kasan/report.c:356 [inline]
 [<ffffffff8153b917>] kasan_report+0x167/0x360 mm/kasan/report.c:408
 [<ffffffff8153bb84>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d3be2>] unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17
 [<ffffffff8107c4fd>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107c5c8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c28b6>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c4088>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e61bf>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff81569353>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156d0ee>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff81570e19>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff81570e19>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff838afa85>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..