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BUG: KCSAN: data-race in pcpu_alloc / pcpu_balance_workfn

read-write to 0xffffffff86f5a5d4 of 4 bytes by task 3586 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_chunk_populated mm/percpu.c:1531 [inline]
 pcpu_balance_populated mm/percpu.c:2088 [inline]
 pcpu_balance_workfn+0x96f/0xa80 mm/percpu.c:2238
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffffffff86f5a5d4 of 4 bytes by task 3942 on cpu 0:
 pcpu_alloc+0xa59/0x1280 mm/percpu.c:1870
 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930
 __percpu_counter_init+0x47/0x130 lib/percpu_counter.c:162
 mm_init+0x55a/0x730 kernel/fork.c:1308
 mm_alloc+0x80/0x90 kernel/fork.c:1340
 bprm_mm_init fs/exec.c:369 [inline]
 alloc_bprm+0x11a/0x4c0 fs/exec.c:1532
 do_execveat_common+0x121/0x7d0 fs/exec.c:1913
 do_execve fs/exec.c:2036 [inline]
 __do_sys_execve fs/exec.c:2112 [inline]
 __se_sys_execve fs/exec.c:2107 [inline]
 __x64_sys_execve+0x5a/0x70 fs/exec.c:2107
 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: 0x00000001 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3942 Comm: dhcpcd-run-hook Not tainted 6.4.0-rc6-syzkaller-00242-g1639fae5132b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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