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BUG: KCSAN: data-race in io_submit_flush_completions / tctx_task_work

write to 0xffff88810891cae8 of 4 bytes by task 20204 on cpu 0:
 io_submit_flush_completions+0x31e/0x3f0 fs/io_uring.c:2123
 __io_queue_sqe+0x241/0x360 fs/io_uring.c:6435
 io_queue_sqe fs/io_uring.c:6464 [inline]
 io_submit_sqe+0x1695/0x3400 fs/io_uring.c:6619
 io_submit_sqes+0x822/0xe50 fs/io_uring.c:6735
 __do_sys_io_uring_enter fs/io_uring.c:9340 [inline]
 __se_sys_io_uring_enter+0x1c7/0xa10 fs/io_uring.c:9283
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9283
 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 0xffff88810891cae8 of 4 bytes by task 20190 on cpu 1:
 ctx_flush_and_put fs/io_uring.c:1906 [inline]
 tctx_task_work+0x32f/0x420 fs/io_uring.c:1952
 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+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000020 -> 0x0000001b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20190 Comm: syz-executor.1 Not tainted 5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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