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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+0x34b/0x370 arch/x86/kernel/unwind_frame.c:76
Read of size 8 at addr ffff88018eedf8b8 by task syz-executor1/25166

CPU: 0 PID: 25166 Comm: syz-executor1 Not tainted 4.9.152+ #15
 ffff8801912a71a0 ffffffff81b47151 0000000000000000 ffffea00063bb7c0
 ffff88018eedf8b8 0000000000000008 ffffffff810abb0b ffff8801912a71d8
 ffffffff81502385 0000000000000000 ffff88018eedf8c0 ffff88018eedf8b8
Call Trace:
 [<ffffffff81b47151>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b47151>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81502385>] print_address_description+0x6f/0x238 mm/kasan/report.c:256
 [<ffffffff815025da>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff815025da>] kasan_report mm/kasan/report.c:412 [inline]
 [<ffffffff815025da>] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:397
 [<ffffffff814f47d4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 [<ffffffff810abb0b>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810abb0b>] __unwind_start+0x34b/0x370 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff810772f9>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff810772f9>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff810773f2>] save_stack_trace_tsk arch/x86/kernel/stacktrace.c:71 [inline]
 [<ffffffff810773f2>] save_stack_trace_tsk+0x42/0x60 arch/x86/kernel/stacktrace.c:66
 [<ffffffff8166a6d2>] proc_pid_stack+0x1a2/0x290 fs/proc/base.c:483
 [<ffffffff81662c86>] proc_single_show+0xf6/0x160 fs/proc/base.c:785
 [<ffffffff81582c4d>] seq_read+0x4cd/0x1250 fs/seq_file.c:240
 [<ffffffff8150b93c>] do_loop_readv_writev.part.0+0xcc/0x2c0 fs/read_write.c:718
 [<ffffffff8150d046>] do_loop_readv_writev fs/read_write.c:707 [inline]
 [<ffffffff8150d046>] do_readv_writev+0x556/0x7a0 fs/read_write.c:873
 [<ffffffff8150d316>] vfs_readv+0x86/0xc0 fs/read_write.c:897
 [<ffffffff815ae64b>] kernel_readv fs/splice.c:363 [inline]
 [<ffffffff815ae64b>] default_file_splice_read+0x44b/0x7e0 fs/splice.c:435
 [<ffffffff815ad718>] do_splice_to+0x108/0x170 fs/splice.c:899
 [<ffffffff815ad9c6>] splice_direct_to_actor+0x246/0x820 fs/splice.c:971
 [<ffffffff815ae145>] do_splice_direct+0x1a5/0x260 fs/splice.c:1080
 [<ffffffff8150f333>] do_sendfile+0x503/0xc00 fs/read_write.c:1393
 [<ffffffff81511325>] SYSC_sendfile64 fs/read_write.c:1454 [inline]
 [<ffffffff81511325>] SyS_sendfile64+0x145/0x160 fs/read_write.c:1440
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff828159d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the page:
page:ffffea00063bb7c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88018eedf780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88018eedf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88018eedf880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff88018eedf900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88018eedf980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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