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

write to 0xffffc9000a5dfa40 of 4 bytes by task 20584 on cpu 0:
 __pollwake fs/select.c:197 [inline]
 pollwake+0xe6/0x140 fs/select.c:217
 __wake_up_common+0x76/0x180 kernel/sched/wait.c:93
 __wake_up_common_lock+0x77/0xb0 kernel/sched/wait.c:123
 pipe_release+0xfa/0x1a0 fs/pipe.c:727
 __fput+0x1e9/0x500 fs/file_table.c:280
 ____fput+0x1b/0x30 fs/file_table.c:313
 task_work_run+0xba/0x120 kernel/task_work.c:123
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xd5b/0x11e0 kernel/exit.c:795
 do_group_exit+0xae/0x1a0 kernel/exit.c:893
 __do_sys_exit_group kernel/exit.c:904 [inline]
 __se_sys_exit_group kernel/exit.c:902 [inline]
 __x64_sys_exit_group+0x2b/0x30 kernel/exit.c:902
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffc9000a5dfa40 of 4 bytes by task 20582 on cpu 1:
 poll_schedule_timeout.constprop.0+0x4c/0xc0 fs/select.c:242
 do_select+0xd7e/0x1020 fs/select.c:603
 core_sys_select+0x2c7/0x5f0 fs/select.c:677
 do_pselect.constprop.0+0x125/0x160 fs/select.c:759
 __do_sys_pselect6 fs/select.c:784 [inline]
 __se_sys_pselect6 fs/select.c:769 [inline]
 __x64_sys_pselect6+0x12a/0x160 fs/select.c:769
 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: 1 PID: 20582 Comm: run-parts 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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