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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff888135444070 of 4 bytes by task 3385 on cpu 1:
 io_get_sqe fs/io_uring.c:7243 [inline]
 io_submit_sqes+0x493/0xde0 fs/io_uring.c:7286
 __do_sys_io_uring_enter fs/io_uring.c:9986 [inline]
 __se_sys_io_uring_enter+0x20d/0xb30 fs/io_uring.c:9928
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9928
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888135444070 of 4 bytes by task 3372 on cpu 0:
 io_sqring_full fs/io_uring.c:1562 [inline]
 io_uring_poll+0x8e/0x150 fs/io_uring.c:9321
 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+0x4b8/0xad0 fs/select.c:1011
 __do_sys_poll fs/select.c:1076 [inline]
 __se_sys_poll+0xf5/0x210 fs/select.c:1064
 __x64_sys_poll+0x3f/0x50 fs/select.c:1064
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000020 -> 0x00000040

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3372 Comm: syz-executor.4 Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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