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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff888136f26870 of 4 bytes by task 24129 on cpu 0:
 io_get_sqe fs/io_uring.c:6725 [inline]
 io_submit_sqes+0x7b4/0xe50 fs/io_uring.c:6777
 __do_sys_io_uring_enter fs/io_uring.c:9392 [inline]
 __se_sys_io_uring_enter+0x213/0xae0 fs/io_uring.c:9334
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9334
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888136f26870 of 4 bytes by task 24126 on cpu 1:
 io_sqring_full fs/io_uring.c:1403 [inline]
 io_uring_poll+0x8e/0x150 fs/io_uring.c:8730
 vfs_poll include/linux/poll.h:90 [inline]
 io_poll_rewait fs/io_uring.c:4886 [inline]
 io_poll_task_func+0x112/0x440 fs/io_uring.c:4963
 tctx_task_work+0x1b8/0x460 fs/io_uring.c:1962
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:212 [inline]
 io_run_task_work fs/io_uring.c:2231 [inline]
 io_run_task_work_sig fs/io_uring.c:7013 [inline]
 __io_uring_register fs/io_uring.c:10113 [inline]
 __do_sys_io_uring_register+0x3b6/0x1fb0 fs/io_uring.c:10252
 __se_sys_io_uring_register fs/io_uring.c:10232 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 fs/io_uring.c:10232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000232 -> 0x00000240

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24126 Comm: syz-executor.5 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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