BUG: unable to handle kernel paging request at ffffc9000800c000
IP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
PGD 1db12d067 P4D 1db12d067 PUD 1db12e067 PMD 1d2b45067 PTE 0
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 14467 Comm: syz-executor5 Not tainted 4.15.0+ #205
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
RSP: 0018:ffff8801b046f368 EFLAGS: 00010246
RAX: fffff5200102c000 RBX: ffffc9000800c000 RCX: 0000000000154000
RDX: 0000000000154000 RSI: 0000000000000000 RDI: ffffc9000800c000
RBP: ffff8801b046f388 R08: 0000000000000000 R09: ffffc9000800c000
R10: 000000000002a800 R11: fffff5200102bfff R12: 0000000000154000
R13: 0000000000000000 R14: ffffffff87072d7c R15: 0000000000000010
FS:  0000000000000000(0000) GS:ffff8801db500000(0063) knlGS:00000000f77c4b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffc9000800c000 CR3: 00000001b3c5f003 CR4: 00000000001626e0
Call Trace:
 memset include/linux/string.h:330 [inline]
 snd_pcm_format_set_silence+0x13f/0x4b0 sound/core/pcm_misc.c:431
 loopback_prepare+0x922/0xbe0 sound/drivers/aloop.c:340
 snd_pcm_do_prepare+0x58/0x90 sound/core/pcm_native.c:1640
 snd_pcm_action_single+0x70/0x110 sound/core/pcm_native.c:1084
 snd_pcm_action_nonatomic+0x95/0xa0 sound/core/pcm_native.c:1151
 snd_pcm_prepare+0x115/0x1a0 sound/core/pcm_native.c:1687
 snd_pcm_kernel_ioctl+0x97/0x240 sound/core/pcm_native.c:2998
 snd_pcm_oss_prepare+0x49/0x150 sound/core/oss/pcm_oss.c:1104
 snd_pcm_oss_make_ready+0xf9/0x130 sound/core/oss/pcm_oss.c:1132
 snd_pcm_oss_set_trigger+0x62d/0x830 sound/core/oss/pcm_oss.c:1957
 snd_pcm_oss_poll+0x77c/0xd20 sound/core/oss/pcm_oss.c:2725
 do_pollfd fs/select.c:826 [inline]
 do_poll fs/select.c:877 [inline]
 do_sys_poll+0x716/0x1050 fs/select.c:971
 SYSC_poll fs/select.c:1029 [inline]
 SyS_poll+0x10d/0x450 fs/select.c:1017
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:129
RIP: 0023:0xf7fc8c79
RSP: 002b:00000000f77c408c EFLAGS: 00000296 ORIG_RAX: 00000000000000a8
RAX: ffffffffffffffda RBX: 0000000020009fe0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 
RIP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65 RSP: ffff8801b046f368
CR2: ffffc9000800c000
---[ end trace 86e9f789556aa152 ]---