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BUG: KCSAN: data-race in snd_seq_check_queue / snd_seq_control_queue

write to 0xffff888093ec5124 of 1 bytes by interrupt on cpu 1:
 queue_access_unlock sound/core/seq/seq_queue.c:370 [inline]
 snd_seq_control_queue+0x15a/0x320 sound/core/seq/seq_queue.c:734
 event_input_timer+0x29/0x40 sound/core/seq/seq_system.c:103
 snd_seq_deliver_single_event.constprop.0+0x403/0x500 sound/core/seq/seq_clientmgr.c:638
 snd_seq_deliver_event+0x2eb/0x4b0 sound/core/seq/seq_clientmgr.c:839
 snd_seq_dispatch_event+0x9d/0x300 sound/core/seq/seq_clientmgr.c:913
 snd_seq_check_queue+0xf1/0x250 sound/core/seq/seq_queue.c:264
 snd_seq_timer_interrupt+0x222/0x260 sound/core/seq/seq_timer.c:158
 snd_timer_process_callbacks+0x1eb/0x230 sound/core/timer.c:796
 snd_timer_interrupt sound/core/timer.c:919 [inline]
 snd_timer_interrupt+0x488/0x950 sound/core/timer.c:840
 snd_hrtimer_callback+0x188/0x250 sound/core/hrtimer.c:50
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
 kcsan_setup_watchpoint+0x25a/0x440 kernel/kcsan/core.c:542
 ipv6_addr_equal include/net/ipv6.h:579 [inline]
 ipv6_rcv_saddr_equal+0x137/0x300 net/ipv4/inet_connection_sock.c:65
 inet_rcv_saddr_equal net/ipv4/inet_connection_sock.c:93 [inline]
 inet_rcv_saddr_equal+0x195/0x1c0 net/ipv4/inet_connection_sock.c:88
 inet_csk_bind_conflict+0x2b5/0x3f0 net/ipv4/inet_connection_sock.c:164
 inet_csk_find_open_port net/ipv4/inet_connection_sock.c:228 [inline]
 inet_csk_get_port+0x7d7/0x1360 net/ipv4/inet_connection_sock.c:312
 __inet6_bind+0x387/0xd80 net/ipv6/af_inet6.c:404
 inet6_bind+0xc0/0xfd net/ipv6/af_inet6.c:454
 rds_tcp_conn_path_connect+0x4bd/0x5d0 net/rds/tcp_connect.c:144
 rds_connect_worker+0x10b/0x1a0 net/rds/threads.c:176
 process_one_work+0x424/0x930 kernel/workqueue.c:2268
 worker_thread+0x9a/0x7e0 kernel/workqueue.c:2414
 kthread+0x203/0x230 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff888093ec5124 of 1 bytes by task 5324 on cpu 0:
 snd_seq_check_queue+0x67/0x250 sound/core/seq/seq_queue.c:249
 snd_seq_enqueue_event+0x15a/0x2a0 sound/core/seq/seq_queue.c:333
 snd_seq_client_enqueue_event.constprop.0+0x187/0x2a0 sound/core/seq/seq_clientmgr.c:974
 snd_seq_write+0x227/0x4e0 sound/core/seq/seq_clientmgr.c:1093
 __vfs_write+0x58/0xb0 fs/read_write.c:495
 vfs_write fs/read_write.c:559 [inline]
 vfs_write+0x189/0x380 fs/read_write.c:543
 ksys_write+0x16a/0x1a0 fs/read_write.c:612
 __do_sys_write fs/read_write.c:624 [inline]
 __se_sys_write fs/read_write.c:621 [inline]
 __x64_sys_write+0x49/0x60 fs/read_write.c:621
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5324 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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