==================================================================
BUG: KASAN: out-of-bounds in get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline] at addr ffff8801c958fba8
BUG: KASAN: out-of-bounds in __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76 at addr ffff8801c958fba8
Read of size 8 by task syzkaller741581/4291
page:ffffea00072563c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected
CPU: 0 PID: 4291 Comm: syzkaller741581 Not tainted 4.9.67-gf26d3c7 #106
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c95b71a0 ffffffff81d906e9 ffffed00392b1f76 0000000000000008
 0000000000000000 ffffed00392b1f76 ffff8801c958fba8 ffff8801c95b7228
 ffffffff8153a833 ffff8801cb8b4800 ffffffff8389f09e ffffffff810d41b7
Call Trace:
 [<ffffffff81d906e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d906e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153a833>] print_address_description mm/kasan/report.c:208 [inline]
 [<ffffffff8153a833>] kasan_report_error mm/kasan/report.c:287 [inline]
 [<ffffffff8153a833>] kasan_report.part.1+0x4c3/0x500 mm/kasan/report.c:309
 [<ffffffff8153a929>] kasan_report mm/kasan/report.c:330 [inline]
 [<ffffffff8153a929>] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330
 [<ffffffff810d41b7>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d41b7>] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107c499>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107c499>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107c598>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c15d6>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c2da8>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e4f2f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff81568cb1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156cb20>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156cb20>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156cdd4>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8160be5f>] kernel_readv fs/splice.c:363 [inline]
 [<ffffffff8160be5f>] default_file_splice_read+0x43f/0x7a0 fs/splice.c:435
 [<ffffffff8160af5a>] do_splice_to+0x10a/0x160 fs/splice.c:899
 [<ffffffff8160b1fd>] splice_direct_to_actor+0x24d/0x800 fs/splice.c:971
 [<ffffffff8160b957>] do_splice_direct+0x1a7/0x270 fs/splice.c:1080
 [<ffffffff8156eb9b>] do_sendfile+0x54b/0xd30 fs/read_write.c:1401
 [<ffffffff81570af1>] SYSC_sendfile64 fs/read_write.c:1456 [inline]
 [<ffffffff81570af1>] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1448
 [<ffffffff838a9985>] entry_SYSCALL_64_fastpath+0x23/0xc6
Memory state around the buggy address:
 ffff8801c958fa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c958fb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c958fb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                     ^
 ffff8801c958fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c958fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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==================================================================
BUG: KASAN: stack-out-of-bounds in get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline] at addr ffff8801cdcd7e60
BUG: KASAN: stack-out-of-bounds in __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76 at addr ffff8801cdcd7e60
Read of size 8 by task syzkaller741581/7495
page:ffffea00073735c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected
CPU: 0 PID: 7495 Comm: syzkaller741581 Tainted: G    B           4.9.67-gf26d3c7 #106
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c93bf1a0 ffffffff81d906e9 ffffed0039b9afcc 0000000000000008
 0000000000000000 ffffed0039b9afcc ffff8801cdcd7e60 ffff8801c93bf228
 ffffffff8153a833 0000000000000000 0000000000000000 ffffffff810d41b7
Call Trace:
 [<ffffffff81d906e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d906e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153a833>] print_address_description mm/kasan/report.c:208 [inline]
 [<ffffffff8153a833>] kasan_report_error mm/kasan/report.c:287 [inline]
 [<ffffffff8153a833>] kasan_report.part.1+0x4c3/0x500 mm/kasan/report.c:309
 [<ffffffff8153a929>] kasan_report mm/kasan/report.c:330 [inline]
 [<ffffffff8153a929>] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330
 [<ffffffff810d41b7>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d41b7>] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107c499>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107c499>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107c598>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c15d6>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c2da8>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e4f2f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff81568cb1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156cb20>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156cb20>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156cdd4>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8160be5f>] kernel_readv fs/splice.c:363 [inline]
 [<ffffffff8160be5f>] default_file_splice_read+0x43f/0x7a0 fs/splice.c:435
 [<ffffffff8160af5a>] do_splice_to+0x10a/0x160 fs/splice.c:899
 [<ffffffff8160b1fd>] splice_direct_to_actor+0x24d/0x800 fs/splice.c:971
 [<ffffffff8160b957>] do_splice_direct+0x1a7/0x270 fs/splice.c:1080
 [<ffffffff8156eb9b>] do_sendfile+0x54b/0xd30 fs/read_write.c:1401
 [<ffffffff81570af1>] SYSC_sendfile64 fs/read_write.c:1456 [inline]
 [<ffffffff81570af1>] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1448
 [<ffffffff838a9985>] entry_SYSCALL_64_fastpath+0x23/0xc6
Memory state around the buggy address:
 ffff8801cdcd7d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cdcd7d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801cdcd7e00: 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2
                                                       ^
 ffff8801cdcd7e80: f2 00 f2 f2 f2 f2 f2 f2 f2 00 00 f2 f2 00 00 00
 ffff8801cdcd7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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