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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff88812a4cc050 of 4 bytes by task 5317 on cpu 0:
 io_get_sqe fs/io_uring.c:6613 [inline]
 io_submit_sqes+0x5a0/0xaf0 fs/io_uring.c:6653
 __do_sys_io_uring_enter fs/io_uring.c:9240 [inline]
 __se_sys_io_uring_enter+0x217/0xb20 fs/io_uring.c:9182
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9182
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812a4cc050 of 4 bytes by task 5306 on cpu 1:
 io_sqring_full fs/io_uring.c:1331 [inline]
 io_uring_poll+0x94/0x160 fs/io_uring.c:8503
 vfs_poll include/linux/poll.h:90 [inline]
 do_pollfd fs/select.c:869 [inline]
 do_poll fs/select.c:917 [inline]
 do_sys_poll+0x622/0xc40 fs/select.c:1011
 __do_sys_ppoll fs/select.c:1117 [inline]
 __se_sys_ppoll+0x169/0x1b0 fs/select.c:1097
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1097
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5306 Comm: syz-executor.3 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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