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BUG: KCSAN: data-race in pcpu_alloc_noprof / pcpu_free_area

read-write to 0xffffffff88be03ac of 4 bytes by task 3464 on cpu 0:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_block_update_hint_free mm/percpu.c:1044 [inline]
 pcpu_free_area+0x4dc/0x570 mm/percpu.c:1302
 free_percpu+0x1c6/0xb30 mm/percpu.c:2246
 htab_free_elems kernel/bpf/hashtab.c:287 [inline]
 prealloc_destroy+0xea/0x1a0 kernel/bpf/hashtab.c:382
 htab_map_free+0x4a0/0x620 kernel/bpf/hashtab.c:1561
 bpf_map_free kernel/bpf/syscall.c:744 [inline]
 bpf_map_free_deferred+0xb0/0x140 kernel/bpf/syscall.c:768
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff88be03ac of 4 bytes by task 5563 on cpu 1:
 pcpu_alloc_noprof+0x9b6/0x10a0 mm/percpu.c:1894
 __percpu_counter_init_many+0x3e/0x1f0 lib/percpu_counter.c:198
 mm_init+0x5b3/0x730 kernel/fork.c:1304
 dup_mm kernel/fork.c:1671 [inline]
 copy_mm+0x11e/0x10e0 kernel/fork.c:1723
 copy_process+0xd5b/0x1f90 kernel/fork.c:2372
 kernel_clone+0x167/0x5e0 kernel/fork.c:2784
 __do_sys_clone3 kernel/fork.c:3088 [inline]
 __se_sys_clone3+0x1ba/0x200 kernel/fork.c:3067
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3067
 x64_sys_call+0x287d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000010d -> 0x00000115

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5563 Comm: syz.1.935 Not tainted 6.12.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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