BUG: unable to handle kernel paging request at ffffc900012ec000
IP: snd_seq_oss_readq_puts+0x146/0x210 sound/core/seq/oss/seq_oss_readq.c:112
PGD 1dac76067 P4D 1dac76067 PUD 1dac77067 PMD 1d58df067 PTE 0
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 26396 Comm: syz-executor7 Not tainted 4.14.0-rc2-mm1+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c810c140 task.stack: ffff8801bf748000
RIP: 0010:snd_seq_oss_readq_puts+0x146/0x210 sound/core/seq/oss/seq_oss_readq.c:112
RSP: 0018:ffff8801bf74f208 EFLAGS: 00010246
RAX: ffffed0037ee9e4a RBX: ffffc900012ec000 RCX: ffff8801bf74f251
RDX: 0000000000000f35 RSI: ffffffff83d87f66 RDI: 0000000000000286
RBP: ffff8801bf74f2b8 R08: ffff8801c0a71450 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000003fffff76
R13: ffff8801bf74f290 R14: ffffc900012ec001 R15: dffffc0000000000
FS:  00007eff42fc5700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900012ec000 CR3: 00000001c90db000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 send_midi_event sound/core/seq/oss/seq_oss_midi.c:616 [inline]
 snd_seq_oss_midi_input+0xd39/0x1040 sound/core/seq/oss/seq_oss_midi.c:535
 snd_seq_oss_event_input+0x15d/0x220 sound/core/seq/oss/seq_oss_event.c:439
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:676 [inline]
 snd_seq_deliver_event+0x318/0x790 sound/core/seq/seq_clientmgr.c:807
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2309
 dummy_input+0x2c4/0x400 sound/core/seq/seq_dummy.c:104
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 snd_seq_deliver_event+0x12c/0x790 sound/core/seq/seq_clientmgr.c:818
 snd_seq_dispatch_event+0x105/0x5b0 sound/core/seq/seq_clientmgr.c:892
 snd_seq_check_queue.part.3+0x38e/0x510 sound/core/seq/seq_queue.c:285
 snd_seq_check_queue sound/core/seq/seq_queue.c:357 [inline]
 snd_seq_enqueue_event+0x32d/0x3d0 sound/core/seq/seq_queue.c:363
 snd_seq_client_enqueue_event+0x21b/0x420 sound/core/seq/seq_clientmgr.c:951
 kernel_client_enqueue.part.10+0xb5/0xd0 sound/core/seq/seq_clientmgr.c:2248
 kernel_client_enqueue sound/core/seq/seq_clientmgr.c:2238 [inline]
 snd_seq_kernel_client_enqueue_blocking+0xcf/0x110 sound/core/seq/seq_clientmgr.c:2275
 insert_queue sound/core/seq/oss/seq_oss_rw.c:189 [inline]
 snd_seq_oss_write+0x5fe/0xa80 sound/core/seq/oss/seq_oss_rw.c:148
 odev_write+0x64/0x90 sound/core/seq/oss/seq_oss.c:177
 __vfs_write+0xef/0x970 fs/read_write.c:479
 vfs_write+0x18f/0x510 fs/read_write.c:543
 SYSC_write fs/read_write.c:588 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:580
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4520a9
RSP: 002b:00007eff42fc4c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000718160 RCX: 00000000004520a9
RDX: 0000000000000060 RSI: 0000000020fca000 RDI: 0000000000000019
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000
R13: 0000000000a6f7ef R14: 00007eff42fc59c0 R15: 0000000000000022
Code: d9 4c 8d 73 01 48 c1 e8 03 83 e1 07 42 0f b6 04 38 38 c8 7f 08 84 c0 0f 85 bf 00 00 00 48 8b 85 58 ff ff ff 48 8b 8d 68 ff ff ff <41> 0f b6 5e ff 0f b6 00 83 e1 07 38 c8 7f 08 84 c0 0f 85 89 00 
RIP: snd_seq_oss_readq_puts+0x146/0x210 sound/core/seq/oss/seq_oss_readq.c:112 RSP: ffff8801bf74f208
CR2: ffffc900012ec000
---[ end trace b90abc8d67f5306d ]---