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BUG: KCSAN: data-race in __io_cqring_fill_event / io_uring_poll

write to 0xffff8881082d9c00 of 4 bytes by task 8529 on cpu 1:
 io_get_cqe fs/io_uring.c:1583 [inline]
 __io_cqring_fill_event+0xfb/0x350 fs/io_uring.c:1771
 io_req_complete_post+0x4d/0x640 fs/io_uring.c:1794
 io_submit_sqe+0x8b4/0x3e80
 io_submit_sqes+0x505/0xde0 fs/io_uring.c:7240
 __io_sq_thread fs/io_uring.c:7308 [inline]
 io_sq_thread+0x5e9/0xc40 fs/io_uring.c:7375
 ret_from_fork+0x1f/0x30

read to 0xffff8881082d9c00 of 4 bytes by task 8525 on cpu 0:
 __io_cqring_events fs/io_uring.c:1567 [inline]
 io_cqring_events fs/io_uring.c:2387 [inline]
 io_uring_poll+0xc6/0x150 fs/io_uring.c:9228
 vfs_poll include/linux/poll.h:90 [inline]
 do_pollfd fs/select.c:869 [inline]
 do_poll fs/select.c:917 [inline]
 do_sys_poll+0x4b8/0xad0 fs/select.c:1011
 __do_sys_ppoll fs/select.c:1117 [inline]
 __se_sys_ppoll+0x18b/0x1d0 fs/select.c:1097
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1097
 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

value changed: 0x00006ecb -> 0x00006ed8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8525 Comm: syz-executor.2 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff8881082d9870 of 4 bytes by task 8529 on cpu 1:
 io_get_sqe fs/io_uring.c:7190 [inline]
 io_submit_sqes+0x493/0xde0 fs/io_uring.c:7233
 __io_sq_thread fs/io_uring.c:7308 [inline]
 io_sq_thread+0x5e9/0xc40 fs/io_uring.c:7375
 ret_from_fork+0x1f/0x30

read to 0xffff8881082d9870 of 4 bytes by task 8525 on cpu 0:
 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]
 do_pollfd fs/select.c:869 [inline]
 do_poll fs/select.c:917 [inline]
 do_sys_poll+0x4b8/0xad0 fs/select.c:1011
 __do_sys_ppoll fs/select.c:1117 [inline]
 __se_sys_ppoll+0x18b/0x1d0 fs/select.c:1097
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1097
 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

value changed: 0x0000a683 -> 0x0000a685

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8525 Comm: syz-executor.2 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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