BUG: unable to handle kernel paging request at ffffc9000133f000
IP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
PGD 1db12c067 P4D 1db12c067 PUD 1db12d067 PMD 1d6a34067 PTE 0
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 8343 Comm: syz-executor3 Not tainted 4.15.0-rc6-mm1+ #51
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:ffff8801cb34f8d8 EFLAGS: 00010246
RAX: fffff52000268080 RBX: ffffc9000133ef77 RCX: 0000000000001000
RDX: 0000000000001089 RSI: 0000000000000080 RDI: ffffc9000133f000
RBP: ffff8801cb34f8f8 R08: 0000000000000000 R09: ffffc9000133ef77
R10: 0000000000000000 R11: fffff52000267fff R12: 0000000000001089
R13: 0000000000000080 R14: ffffffff8646ae90 R15: 0000000000000008
FS:  00007f168074f700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000133f000 CR3: 0000000005e22002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 memset include/linux/string.h:329 [inline]
 snd_pcm_format_set_silence+0x13f/0x4b0 sound/core/pcm_misc.c:431
 snd_pcm_oss_sync+0x4c3/0x710 sound/core/oss/pcm_oss.c:1587
 snd_pcm_oss_release+0x20b/0x280 sound/core/oss/pcm_oss.c:2430
 __fput+0x291/0x6e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x122/0x1a0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x7f4/0x2da0 kernel/exit.c:869
 do_group_exit+0x108/0x320 kernel/exit.c:972
 get_signal+0x5e9/0x1460 kernel/signal.c:2337
 do_signal+0x7f/0x1980 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x1aa/0x210 arch/x86/entry/common.c:161
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x383/0x430 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x98/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f168074ece8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000071bf80 RCX: 0000000000452ac9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bf80
RBP: 000000000071bf80 R08: 000000000000030f R09: 000000000071bf58
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007f168074f9c0 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: ffff8801cb34f8d8
CR2: ffffc9000133f000
---[ end trace 19952d81d8473b96 ]---