==================================================================
BUG: KASAN: stack-out-of-bounds in strlen lib/string.c:481 [inline]
BUG: KASAN: stack-out-of-bounds in strlcpy+0x101/0x120 lib/string.c:141
Read of size 1 at addr ffff8800a9d0fc0c by task syz-executor1/11230

CPU: 1 PID: 11230 Comm: syz-executor1 Not tainted 4.4.151-g37af2ff #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 c0f1b98ea6d381f9 ffff8800a9d0fa80 ffffffff81e15eed
 ffffea0002a743c0 ffff8800a9d0fc0c 0000000000000000 ffff8800a9d0fc0c
 ffff8800a9d0fb80 ffff8800a9d0fab8 ffffffff8151b390 ffff8800a9d0fc0c
Call Trace:
 [<ffffffff81e15eed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e15eed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151b390>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151b6af>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151b6af>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fe5e4>] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426
 [<ffffffff81e32ef1>] strlen lib/string.c:481 [inline]
 [<ffffffff81e32ef1>] strlcpy+0x101/0x120 lib/string.c:141
 [<ffffffff82e6223f>] snd_seq_ioctl_create_queue+0x1bf/0x2c0 sound/core/seq/seq_clientmgr.c:1561
 [<ffffffff82e642b7>] snd_seq_do_ioctl+0x177/0x1a0 sound/core/seq/seq_clientmgr.c:2223
 [<ffffffff82e64a2c>] snd_seq_ioctl_compat+0x19c/0x2a0 sound/core/seq/seq_compat.c:126
 [<ffffffff8162e254>] C_SYSC_ioctl fs/compat_ioctl.c:1592 [inline]
 [<ffffffff8162e254>] compat_SyS_ioctl+0x484/0x2270 fs/compat_ioctl.c:1544
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a

The buggy address belongs to the page:
page:ffffea0002a743c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8800a9d0fb00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
 ffff8800a9d0fb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8800a9d0fc00: 00 04 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00
                      ^
 ffff8800a9d0fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8800a9d0fd00: 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2
==================================================================
blk_update_request: 128 callbacks suppressed
blk_update_request: I/O error, dev loop0, sector 2304
blk_update_request: I/O error, dev loop0, sector 2559
blk_update_request: I/O error, dev loop0, sector 2814