BUG: unable to handle kernel paging request at ffffc900012ff000
IP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
PGD 1dad2c067 P4D 1dad2c067 PUD 1dad2d067 PMD 1d6621067 PTE 0
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 13345 Comm: syz-executor1 Not tainted 4.15.0-rc7+ #172
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:ffff8801a98ef368 EFLAGS: 00010246
RAX: fffff5200029ee00 RBX: ffffc900012ff000 RCX: 00000000001f8200
RDX: 00000000001f8200 RSI: 0000000000000000 RDI: ffffc900012ff000
RBP: ffff8801a98ef388 R08: 0000000000000000 R09: ffffc900012ff000
R10: 000000000003f040 R11: fffff5200029ee3f R12: 00000000001f8200
R13: 0000000000000000 R14: ffffffff86e6b03c R15: 0000000000000010
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7784b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffc900012ff000 CR3: 00000001c048a006 CR4: 00000000001606f0
Call Trace:
 memset include/linux/string.h:329 [inline]
 snd_pcm_format_set_silence+0x13f/0x4b0 sound/core/pcm_misc.c:414
 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:822 [inline]
 do_poll fs/select.c:872 [inline]
 do_sys_poll+0x715/0x10b0 fs/select.c:966
 SYSC_poll fs/select.c:1024 [inline]
 SyS_poll+0x10d/0x450 fs/select.c:1012
 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: 0023:0xf7f88c79
RSP: 002b:00000000f778408c 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: ffff8801a98ef368
CR2: ffffc900012ff000
---[ end trace e3885bb17ff3fd34 ]---