BUG: unable to handle kernel paging request at ffffc90001256000
IP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
PGD 1dad2c067 P4D 1dad2c067 PUD 1dad2d067 PMD 1d661e067 PTE 0
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 6397 Comm: syz-executor4 Not tainted 4.15.0-rc9+ #274
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:ffff8801a5a3fac0 EFLAGS: 00010246
RAX: fffff5200024ca80 RBX: ffffc90001255001 RCX: 000000000000f000
RDX: 000000000000ffff RSI: 0000000000000080 RDI: ffffc90001256000
RBP: ffff8801a5a3fae0 R08: 0000000000000000 R09: ffffc90001255001
R10: 0000000000002000 R11: fffff5200024c9ff R12: 000000000000ffff
R13: 0000000000000080 R14: ffffffff86e6b8f0 R15: 0000000000000008
FS:  00007f51149e3700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90001256000 CR3: 00000001d0a4b006 CR4: 00000000001626f0
Call Trace:
 memset include/linux/string.h:329 [inline]
 snd_pcm_format_set_silence+0x13f/0x4b0 sound/core/pcm_misc.c:414
 snd_pcm_oss_sync+0x585/0x830 sound/core/oss/pcm_oss.c:1601
 snd_pcm_oss_release+0x20b/0x280 sound/core/oss/pcm_oss.c:2444
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x9e/0xa0
RIP: 0033:0x452ef9
RSP: 002b:00007f51149e2c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000000000071bf58 RCX: 0000000000452ef9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000013
RBP: 0000000000000052 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef850
R13: 00000000ffffffff R14: 00007f51149e36d4 R15: 0000000000000002
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: ffff8801a5a3fac0
CR2: ffffc90001256000
---[ end trace 5036e7749a8d53ce ]---