==================================================================
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 ffff8801d909f96a by task syz-executor7/29589

CPU: 0 PID: 29589 Comm: syz-executor7 Not tainted 4.9.79-g71f1469 #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ba6e7b50 ffffffff81d94829 ffffea00076427c0 ffff8801d909f96a
 0000000000000000 ffff8801d909f96a 0000000000000000 ffff8801ba6e7b88
 ffffffff8153e083 ffff8801d909f96a 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d94829>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94829>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153e083>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153e5a5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153e5a5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153e704>] __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
 [<ffffffff8107c6bd>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107c788>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c54b6>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c6c88>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e59b1>] traverse+0x231/0x900 fs/seq_file.c:124
 [<ffffffff815e61b6>] seq_lseek+0x136/0x3c0 fs/seq_file.c:337
 [<ffffffff8156f5ab>] vfs_llseek fs/read_write.c:301 [inline]
 [<ffffffff8156f5ab>] SYSC_lseek fs/read_write.c:314 [inline]
 [<ffffffff8156f5ab>] SyS_lseek fs/read_write.c:305 [inline]
 [<ffffffff8156f5ab>] C_SYSC_lseek fs/read_write.c:326 [inline]
 [<ffffffff8156f5ab>] compat_SyS_lseek+0xeb/0x170 fs/read_write.c:324
 [<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
 [<ffffffff838b4d34>] entry_SYSENTER_compat+0x74/0x83 arch/x86/entry/entry_64_compat.S:127

The buggy address belongs to the page:
page:ffffea00076427c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d909f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d909f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d909f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                          ^
 ffff8801d909f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d909fa00: 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: 29589 Comm: syz-executor7 Tainted: G    B           4.9.79-g71f1469 #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ba6e7aa8 ffffffff81d94829 ffffffff8419709f ffff8801ba6e7b80
 0000000000000000 ffff8801d909f96a 0000000000000000 ffff8801ba6e7b70
 ffffffff8142f531 0000000041b58ab3 ffffffff8418ab10 ffffffff8142f375
Call Trace:
 [<ffffffff81d94829>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94829>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142f531>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff8153dff0>] kasan_end_report+0x50/0x50 mm/kasan/report.c:176
 [<ffffffff8153e497>] kasan_report_error mm/kasan/report.c:356 [inline]
 [<ffffffff8153e497>] kasan_report+0x167/0x360 mm/kasan/report.c:408
 [<ffffffff8153e704>] __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
 [<ffffffff8107c6bd>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107c788>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c54b6>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c6c88>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e59b1>] traverse+0x231/0x900 fs/seq_file.c:124
 [<ffffffff815e61b6>] seq_lseek+0x136/0x3c0 fs/seq_file.c:337
 [<ffffffff8156f5ab>] vfs_llseek fs/read_write.c:301 [inline]
 [<ffffffff8156f5ab>] SYSC_lseek fs/read_write.c:314 [inline]
 [<ffffffff8156f5ab>] SyS_lseek fs/read_write.c:305 [inline]
 [<ffffffff8156f5ab>] C_SYSC_lseek fs/read_write.c:326 [inline]
 [<ffffffff8156f5ab>] compat_SyS_lseek+0xeb/0x170 fs/read_write.c:324
 [<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
 [<ffffffff838b4d34>] entry_SYSENTER_compat+0x74/0x83 arch/x86/entry/entry_64_compat.S:127
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..