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BUG: KCSAN: data-race in poll_schedule_timeout.constprop.0 / pollwake

write to 0xffffc90001467a40 of 4 bytes by task 7605 on cpu 1:
 __pollwake fs/select.c:197 [inline]
 pollwake+0xe3/0x140 fs/select.c:217
 __wake_up_common+0x7b/0x180 kernel/sched/wait.c:93
 __wake_up_common_lock+0x77/0xb0 kernel/sched/wait.c:123
 __wake_up_sync_key+0x19/0x20 kernel/sched/wait.c:196
 pipe_write+0x656/0x970 fs/pipe.c:503
 call_write_iter include/linux/fs.h:1895 [inline]
 new_sync_write+0x388/0x4a0 fs/read_write.c:483
 __vfs_write+0xb1/0xc0 fs/read_write.c:496
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_write+0xd5/0x1b0 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/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffc90001467a40 of 4 bytes by task 7598 on cpu 0:
 poll_schedule_timeout.constprop.0+0x50/0xc0 fs/select.c:242
 do_select+0xd7f/0x1020 fs/select.c:603
 core_sys_select+0x381/0x550 fs/select.c:677
 kern_select+0x106/0x170 fs/select.c:718
 __do_sys_select fs/select.c:725 [inline]
 __se_sys_select fs/select.c:722 [inline]
 __x64_sys_select+0x70/0x90 fs/select.c:722
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7598 Comm: sshd Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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