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BUG: KCSAN: data-race in pcpu_alloc / pcpu_balance_workfn

read-write to 0xffffffff86e48674 of 4 bytes by task 20504 on cpu 1:
 pcpu_balance_workfn+0x96f/0xa80
 process_one_work+0x3e6/0x750
 worker_thread+0x5ef/0xa10
 kthread+0x1ac/0x1e0
 ret_from_fork+0x1f/0x30

read to 0xffffffff86e48674 of 4 bytes by task 4903 on cpu 0:
 pcpu_alloc+0x9cf/0x10c0
 __alloc_percpu_gfp+0x26/0x30
 percpu_ref_init+0x30/0x240
 io_rsrc_node_switch_start+0x75/0x110
 io_uring_create+0x4c9/0x780
 __x64_sys_io_uring_setup+0x11c/0x130
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000001 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4903 Comm: syz-executor.5 Tainted: G        W          6.2.0-rc7-syzkaller-00011-g05ecb680708a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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