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BUG: KCSAN: data-race in snd_seq_check_queue / snd_seq_control_queue

write to 0xffff88811e71b2a4 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
 preempt_count arch/x86/include/asm/preempt.h:26 [inline]
 get_ctx kernel/kcsan/core.c:193 [inline]
 check_access kernel/kcsan/core.c:579 [inline]
 __tsan_read1+0x6d/0x110 kernel/kcsan/core.c:767
 strcmp+0x27/0x70 lib/string.c:363
 kernfs_dop_revalidate+0x137/0x230 fs/kernfs/dir.c:574
 d_revalidate fs/namei.c:754 [inline]
 d_revalidate fs/namei.c:751 [inline]
 lookup_fast+0x22a/0x3a0 fs/namei.c:1491
 walk_component+0x6a/0x390 fs/namei.c:1842
 link_path_walk.part.0+0x469/0x700 fs/namei.c:2169
 link_path_walk fs/namei.c:2292 [inline]
 path_lookupat.isra.0+0x75/0x350 fs/namei.c:2318
 filename_lookup+0x145/0x2c0 fs/namei.c:2352
 user_path_at_empty+0x47/0x60 fs/namei.c:2632
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0xdb/0x190 fs/stat.c:197
 vfs_lstat include/linux/fs.h:3284 [inline]
 __do_sys_newlstat+0x50/0xb0 fs/stat.c:364
 __se_sys_newlstat fs/stat.c:358 [inline]
 __x64_sys_newlstat+0x37/0x50 fs/stat.c:358
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88811e71b2a4 of 1 bytes by task 10931 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: 10931 Comm: syz-executor.3 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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