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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff88810820e070 of 4 bytes by task 16423 on cpu 0:
 io_get_sqe io_uring/io_uring.c:2395 [inline]
 io_submit_sqes+0x249/0xfe0 io_uring/io_uring.c:2441
 __do_sys_io_uring_enter io_uring/io_uring.c:3458 [inline]
 __se_sys_io_uring_enter+0x1e5/0x1b70 io_uring/io_uring.c:3392
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3392
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810820e070 of 4 bytes by task 16422 on cpu 1:
 io_sqring_full io_uring/io_uring.h:259 [inline]
 io_uring_poll+0xcd/0x1a0 io_uring/io_uring.c:2891
 vfs_poll include/linux/poll.h:88 [inline]
 p9_fd_poll net/9p/trans_fd.c:237 [inline]
 p9_conn_create+0x228/0x310 net/9p/trans_fd.c:603
 p9_fd_create+0x23a/0x250 net/9p/trans_fd.c:1096
 p9_client_create+0x595/0xa70 net/9p/client.c:1011
 v9fs_session_init+0xf9/0xd10 fs/9p/v9fs.c:407
 v9fs_mount+0x69/0x650 fs/9p/vfs_super.c:125
 legacy_get_tree+0x74/0xd0 fs/fs_context.c:610
 vfs_get_tree+0x51/0x190 fs/super.c:1501
 do_new_mount+0x200/0x650 fs/namespace.c:3042
 path_mount+0x498/0xb40 fs/namespace.c:3372
 do_mount fs/namespace.c:3385 [inline]
 __do_sys_mount fs/namespace.c:3594 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3571
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3571
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000568 -> 0x00000570

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16422 Comm: syz-executor.5 Not tainted 6.3.0-rc2-syzkaller-00050-g9c1bec9c0b08 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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