audit: type=1400 audit(1538385481.129:66519): avc:  denied  { sys_admin } for  pid=2092 comm="syz-executor0" capability=21  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
==================================================================
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+0x368/0x3b0 arch/x86/kernel/unwind_frame.c:76
Read of size 8 at addr ffff8801c3e7f5a0 by task syz-executor1/19739

CPU: 1 PID: 19739 Comm: syz-executor1 Not tainted 4.9.130+ #98
 ffff8801d097f070 ffffffff81b36c89 ffffea00070f9fc0 ffff8801c3e7f5a0
 0000000000000000 ffff8801c3e7f5a8 ffff8801d3ad5f00 ffff8801d097f0a8
 ffffffff8150080d ffff8801c3e7f5a0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81b36c89>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b36c89>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8150080d>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff81500c17>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff81500c17>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff814f2e24>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 [<ffffffff810acab8>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810acab8>] __unwind_start+0x368/0x3b0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff81077939>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff81077939>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff81077a38>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff81665e78>] proc_pid_stack+0x148/0x220 fs/proc/base.c:469
 [<ffffffff8165e3fd>] proc_single_show+0xfd/0x170 fs/proc/base.c:771
 [<ffffffff8157fba3>] traverse+0x363/0x920 fs/seq_file.c:124
 [<ffffffff8158123b>] seq_read+0xd1b/0x12d0 fs/seq_file.c:195
 [<ffffffff81509c45>] do_loop_readv_writev.part.1+0xd5/0x280 fs/read_write.c:718
 [<ffffffff8150b2ee>] do_loop_readv_writev fs/read_write.c:707 [inline]
 [<ffffffff8150b2ee>] do_readv_writev+0x56e/0x7b0 fs/read_write.c:873
 [<ffffffff8150b5b4>] vfs_readv+0x84/0xc0 fs/read_write.c:897
 [<ffffffff815ac031>] kernel_readv fs/splice.c:363 [inline]
 [<ffffffff815ac031>] default_file_splice_read+0x451/0x7f0 fs/splice.c:435
 [<ffffffff815ab12c>] do_splice_to+0x10c/0x170 fs/splice.c:899
 [<ffffffff815ab3cf>] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971
 [<ffffffff815abb13>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff8150d5d0>] do_sendfile+0x4f0/0xc30 fs/read_write.c:1393
 [<ffffffff8150f641>] SYSC_sendfile64 fs/read_write.c:1448 [inline]
 [<ffffffff8150f641>] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1440
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82803013>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the page:
page:ffffea00070f9fc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c3e7f480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c3e7f500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c3e7f580: f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 f3 f3
                                  ^
 ffff8801c3e7f600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c3e7f680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================