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BUG: KCSAN: data-race in snd_seq_oss_readq_put_timestamp / snd_seq_oss_readq_put_timestamp

write to 0xffff88813aaa0da0 of 8 bytes by task 2047 on cpu 0:
 snd_seq_oss_readq_put_timestamp+0x2a0/0x2c0 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/oss/seq_oss_readq.c:233
 send_midi_event syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/oss/seq_oss_midi.c:600 [inline]
 snd_seq_oss_midi_input+0x29f/0x500 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/oss/seq_oss_midi.c:524
 snd_seq_oss_event_input+0xbc/0x100 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/oss/seq_oss_event.c:429
 snd_seq_deliver_single_event+0x31e/0x4f0 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_clientmgr.c:637
 deliver_to_subscribers syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_clientmgr.c:692 [inline]
 snd_seq_deliver_event+0x38d/0x4a0 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_clientmgr.c:827
 snd_seq_kernel_client_dispatch+0x16f/0x190 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_clientmgr.c:2322
 snd_vmidi_output_work+0x16d/0x200 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_virmidi.c:150
 process_one_work+0x3e1/0x950 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/workqueue.c:2421
 kthread+0x20b/0x230 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 syzkaller/managers/upstream-kcsan-gce/kernel/arch/x86/entry/entry_64.S:296

read to 0xffff88813aaa0da0 of 8 bytes by task 2197 on cpu 1:
 snd_seq_oss_readq_put_timestamp+0x28/0x2c0 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/oss/seq_oss_readq.c:218
 send_midi_event syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/oss/seq_oss_midi.c:600 [inline]
 snd_seq_oss_midi_input+0x29f/0x500 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/oss/seq_oss_midi.c:524
 snd_seq_oss_event_input+0xbc/0x100 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/oss/seq_oss_event.c:429
 snd_seq_deliver_single_event+0x31e/0x4f0 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_clientmgr.c:637
 deliver_to_subscribers syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_clientmgr.c:692 [inline]
 snd_seq_deliver_event+0x38d/0x4a0 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_clientmgr.c:827
 snd_seq_kernel_client_dispatch+0x16f/0x190 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_clientmgr.c:2322
 snd_vmidi_output_work+0x16d/0x200 syzkaller/managers/upstream-kcsan-gce/kernel/sound/core/seq/seq_virmidi.c:150
 process_one_work+0x3e1/0x950 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/workqueue.c:2421
 kthread+0x20b/0x230 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 syzkaller/managers/upstream-kcsan-gce/kernel/arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2197 Comm: kworker/1:1H Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_highpri snd_vmidi_output_work
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