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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff88817591c070 of 4 bytes by task 17016 on cpu 0:
 io_get_sqe fs/io_uring.c:7190 [inline]
 io_submit_sqes+0x493/0xde0 fs/io_uring.c:7233
 __do_sys_io_uring_enter fs/io_uring.c:9882 [inline]
 __se_sys_io_uring_enter+0x20d/0xb30 fs/io_uring.c:9824
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9824
 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 0xffff88817591c070 of 4 bytes by task 16985 on cpu 1:
 io_sqring_full fs/io_uring.c:1562 [inline]
 io_uring_poll+0x8e/0x150 fs/io_uring.c:9212
 vfs_poll include/linux/poll.h:90 [inline]
 io_poll_rewait fs/io_uring.c:5234 [inline]
 io_poll_task_func+0x125/0x5b0 fs/io_uring.c:5320
 tctx_task_work+0x275/0x4d0 fs/io_uring.c:2163
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:212 [inline]
 handle_signal_work kernel/entry/common.c:146 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0xf8/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00002995 -> 0x0000299a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16985 Comm: syz-executor.2 Tainted: G        W         5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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