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BUG: KCSAN: data-race in do_sys_poll / pollwake

read to 0xffffc90013553c10 of 4 bytes by task 5658 on cpu 1:
 poll_schedule_timeout fs/select.c:240 [inline]
 do_poll fs/select.c:964 [inline]
 do_sys_poll+0x986/0xc10 fs/select.c:1015
 __do_sys_poll fs/select.c:1080 [inline]
 __se_sys_poll+0xe1/0x200 fs/select.c:1068
 __x64_sys_poll+0x43/0x50 fs/select.c:1068
 x64_sys_call+0x29db/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:8
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffffc90013553c10 of 4 bytes by task 5670 on cpu 0:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xbe/0x110 fs/select.c:215
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up+0x65/0xb0 kernel/sched/wait.c:127
 snd_seq_cell_free+0x1e7/0x210 sound/core/seq/seq_memory.c:259
 snd_seq_dispatch_event+0x210/0x240
 snd_seq_check_queue+0x17b/0x300 sound/core/seq/seq_queue.c:256
 snd_seq_enqueue_event+0x26e/0x2a0 sound/core/seq/seq_queue.c:330
 snd_seq_client_enqueue_event+0x21a/0x2b0 sound/core/seq/seq_clientmgr.c:946
 snd_seq_write+0x3f3/0x500 sound/core/seq/seq_clientmgr.c:1084
 vfs_write+0x26c/0x910 fs/read_write.c:681
 ksys_write+0xeb/0x1b0 fs/read_write.c:736
 __do_sys_write fs/read_write.c:748 [inline]
 __se_sys_write fs/read_write.c:745 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:745
 x64_sys_call+0x27dd/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5670 Comm: syz.4.919 Not tainted 6.11.0-syzkaller-10622-gaa486552a110 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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