BUG: unable to handle kernel paging request at ffffc900012a1000
IP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
PGD 1dad2c067 P4D 1dad2c067 PUD 1dad2d067 PMD 1d6628067 PTE 0
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 9921 Comm: syz-executor0 Not tainted 4.15.0-rc7-next-20180112+ #95
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:ffff8801c3ea7b78 EFLAGS: 00010246
RAX: fffff52000255f00 RBX: ffffc900012a1000 RCX: 000000000000ee51
RDX: 000000000000ee51 RSI: 0000000000000000 RDI: ffffc900012a1000
RBP: ffff8801c3ea7b98 R08: fffff52000255fcb R09: ffffc900012a1000
R10: 0000000000001dcb R11: fffff52000255fca R12: 000000000000ee51
R13: 0000000000000000 R14: 00007ffffffff000 R15: 000000002001be51
FS:  00007fcb5cb7e700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900012a1000 CR3: 00000001c2007001 CR4: 00000000001626e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 memset include/linux/string.h:329 [inline]
 _copy_from_user+0xe9/0x110 lib/usercopy.c:16
 copy_from_user include/linux/uaccess.h:147 [inline]
 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1347 [inline]
 snd_pcm_oss_write+0x438/0x880 sound/core/oss/pcm_oss.c:2659
 __vfs_write+0xef/0x970 fs/read_write.c:480
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452ac9
RSP: 002b:00007fcb5cb7dc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fcb5cb7e700 RCX: 0000000000452ac9
RDX: 000000000000fe51 RSI: 000000002000c000 RDI: 0000000000000013
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007fcb5cb7e9c0 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: ffff8801c3ea7b78
CR2: ffffc900012a1000
---[ end trace ad363d001ad28d43 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..