==================================================================
BUG: KCSAN: data-race in snd_seq_check_queue / snd_seq_control_queue

read to 0xffff88812197f8a4 of 1 bytes by interrupt on cpu 1:
 snd_seq_check_queue+0x59/0x200 sound/core/seq/seq_queue.c:247
 snd_seq_timer_interrupt+0x243/0x280 sound/core/seq/seq_timer.c:158
 snd_timer_process_callbacks+0x1e4/0x220 sound/core/timer.c:750
 snd_timer_interrupt sound/core/timer.c:873 [inline]
 snd_timer_interrupt+0x483/0x930 sound/core/timer.c:794
 snd_hrtimer_callback+0x18f/0x260 sound/core/hrtimer.c:50
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x274/0x5f0 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 rt6_find_cached_rt.isra.0+0x0/0x180 net/ipv6/route.c:1557
 ip6_pol_route_output+0x48/0x60 net/ipv6/route.c:2453
 fib6_rule_lookup+0x95/0x470 net/ipv6/fib6_rules.c:114
 ip6_route_output_flags_noref+0x16b/0x230 net/ipv6/route.c:2485
 ip6_route_output_flags+0x50/0x1a0 net/ipv6/route.c:2498
 ip6_route_output include/net/ip6_route.h:98 [inline]
 ip6_dst_lookup_tail+0x917/0xc50 net/ipv6/ip6_output.c:1025
 ip6_dst_lookup_flow+0x5c/0x110 net/ipv6/ip6_output.c:1153
 ip6_datagram_dst_update+0x330/0x620 net/ipv6/datagram.c:88
 __ip6_datagram_connect+0x57c/0x9f0 net/ipv6/datagram.c:247
 ip6_datagram_connect+0x39/0x60 net/ipv6/datagram.c:271
 inet_dgram_connect+0xcf/0x1a0 net/ipv4/af_inet.c:571
 __sys_connect_file+0xf4/0x100 net/socket.c:1844
 __sys_connect+0x121/0x150 net/socket.c:1861
 __do_sys_connect net/socket.c:1872 [inline]
 __se_sys_connect net/socket.c:1869 [inline]
 __x64_sys_connect+0x4c/0x60 net/socket.c:1869
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812197f8a4 of 1 bytes by task 17221 on cpu 0:
 queue_access_unlock sound/core/seq/seq_queue.c:367 [inline]
 snd_seq_control_queue+0x167/0x350 sound/core/seq/seq_queue.c:726
 event_input_timer+0x2f/0x50 sound/core/seq/seq_system.c:103
 snd_seq_deliver_single_event.constprop.0+0x3e8/0x4d0 sound/core/seq/seq_clientmgr.c:638
 snd_seq_deliver_event+0x2e9/0x4c0 sound/core/seq/seq_clientmgr.c:839
 snd_seq_dispatch_event+0xa1/0x340 sound/core/seq/seq_clientmgr.c:913
 snd_seq_check_queue+0xeb/0x200 sound/core/seq/seq_queue.c:262
 snd_seq_enqueue_event+0x163/0x2b0 sound/core/seq/seq_queue.c:330
 snd_seq_client_enqueue_event.constprop.0+0x187/0x2a0 sound/core/seq/seq_clientmgr.c:974
 snd_seq_write+0x23f/0x4d0 sound/core/seq/seq_clientmgr.c:1093
 __vfs_write+0x67/0xc0 fs/read_write.c:494
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_write+0x17b/0x1b0 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x4c/0x60 fs/read_write.c:620
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17221 Comm: syz-executor.3 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================