==================================================================
BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff88804015a050 of 4 bytes by task 20177 on cpu 0:
 io_consume_sqe fs/io_uring.c:6371 [inline]
 io_submit_sqes+0x785/0xfb0 fs/io_uring.c:6472
 __do_sys_io_uring_enter fs/io_uring.c:8262 [inline]
 __se_sys_io_uring_enter+0x1c2/0x720 fs/io_uring.c:8221
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:8221
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88804015a050 of 4 bytes by task 20181 on cpu 1:
 io_uring_poll+0x90/0x140 fs/io_uring.c:7899
 vfs_poll include/linux/poll.h:90 [inline]
 do_select+0x8f6/0xf70 fs/select.c:534
 core_sys_select+0x3e3/0x610 fs/select.c:677
 do_pselect fs/select.c:759 [inline]
 __do_sys_pselect6 fs/select.c:800 [inline]
 __se_sys_pselect6+0x248/0x290 fs/select.c:791
 __x64_sys_pselect6+0x74/0x80 fs/select.c:791
 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: 1 PID: 20181 Comm: syz-executor.1 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================