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BUG: KCSAN: data-race in io_submit_flush_completions / tctx_task_work

write to 0xffff8881086a3340 of 4 bytes by task 25614 on cpu 1:
 io_submit_flush_completions+0x2f8/0x3c0 fs/io_uring.c:2120
 ctx_flush_and_put fs/io_uring.c:1812 [inline]
 __tctx_task_work fs/io_uring.c:1848 [inline]
 tctx_task_work+0x2c8/0x3d0 fs/io_uring.c:1858
 task_work_run+0xae/0x130 kernel/task_work.c:140
 tracehook_notify_signal include/linux/tracehook.h:212 [inline]
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0xf3/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881086a3340 of 4 bytes by task 25627 on cpu 0:
 ctx_flush_and_put fs/io_uring.c:1810 [inline]
 __tctx_task_work fs/io_uring.c:1848 [inline]
 tctx_task_work+0x282/0x3d0 fs/io_uring.c:1858
 task_work_run+0xae/0x130 kernel/task_work.c:140
 tracehook_notify_signal include/linux/tracehook.h:212 [inline]
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0xf3/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25627 Comm: syz-executor.0 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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