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BUG: KCSAN: data-race in __io_queue_sqe / tctx_task_work

write to 0xffff888134f6dae8 of 4 bytes by task 19264 on cpu 0:
 __io_queue_sqe+0x1f9/0x360 fs/io_uring.c:6433
 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 0xffff888134f6dae8 of 4 bytes by task 19261 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
 io_run_task_work fs/io_uring.c:2197 [inline]
 io_run_task_work_sig fs/io_uring.c:6962 [inline]
 io_cqring_wait_schedule fs/io_uring.c:6979 [inline]
 io_cqring_wait+0x437/0x7d0 fs/io_uring.c:7050
 __do_sys_io_uring_enter fs/io_uring.c:9366 [inline]
 __se_sys_io_uring_enter+0x5ea/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

value changed: 0x00000006 -> 0x0000001b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19261 Comm: syz-executor.4 Tainted: G        W         5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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