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BUG: KCSAN: data-race in snd_pcm_oss_change_params_locked / snd_pcm_oss_poll

read to 0xffff88810e988700 of 1 bytes by task 28156 on cpu 1:
 snd_pcm_oss_poll+0x3c4/0x510 sound/core/oss/pcm_oss.c:2826
 vfs_poll include/linux/poll.h:90 [inline]
 do_select+0x8e4/0xf30 fs/select.c:534
 core_sys_select+0x41f/0x670 fs/select.c:677
 kern_select fs/select.c:718 [inline]
 __do_sys_select fs/select.c:725 [inline]
 __se_sys_select+0x180/0x1c0 fs/select.c:722
 __x64_sys_select+0x63/0x70 fs/select.c:722
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read-write to 0xffff88810e988700 of 1 bytes by task 28173 on cpu 0:
 snd_pcm_oss_change_params_locked+0x2477/0x2600 sound/core/oss/pcm_oss.c:1056
 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1084 [inline]
 snd_pcm_oss_mmap+0x1c5/0x300 sound/core/oss/pcm_oss.c:2882
 call_mmap include/linux/fs.h:1892 [inline]
 mmap_region+0xd19/0x13f0 mm/mmap.c:1807
 do_mmap+0x77d/0xc90 mm/mmap.c:1583
 vm_mmap_pgoff+0xe5/0x170 mm/util.c:507
 ksys_mmap_pgoff+0x2a8/0x380 mm/mmap.c:1634
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28173 Comm: syz-executor.0 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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