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BUG: KCSAN: data-race in snd_pcm_oss_make_ready_locked / snd_pcm_oss_poll

write to 0xffff888075957f00 of 1 bytes by task 31499 on cpu 1:
 snd_pcm_oss_poll+0x40e/0x5f0 sound/core/oss/pcm_oss.c:2830
 vfs_poll include/linux/poll.h:90 [inline]
 aio_poll+0x2c9/0xc00 fs/aio.c:1764
 __io_submit_one fs/aio.c:1841 [inline]
 io_submit_one+0x5ee/0xd80 fs/aio.c:1878
 __do_sys_io_submit fs/aio.c:1937 [inline]
 __se_sys_io_submit fs/aio.c:1907 [inline]
 __x64_sys_io_submit+0x104/0x2a0 fs/aio.c:1907
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888075957f00 of 1 bytes by task 31495 on cpu 0:
 snd_pcm_oss_make_ready_locked+0x3c/0xe0 sound/core/oss/pcm_oss.c:1165
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1494 [inline]
 snd_pcm_oss_read+0x26d/0x510 sound/core/oss/pcm_oss.c:2742
 do_loop_readv_writev fs/read_write.c:715 [inline]
 do_loop_readv_writev fs/read_write.c:702 [inline]
 do_iter_read+0x33f/0x3a0 fs/read_write.c:936
 vfs_readv+0x9c/0xf0 fs/read_write.c:1054
 do_readv+0xd9/0x240 fs/read_write.c:1091
 __do_sys_readv fs/read_write.c:1182 [inline]
 __se_sys_readv fs/read_write.c:1179 [inline]
 __x64_sys_readv+0x4b/0x60 fs/read_write.c:1179
 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: 31495 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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