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BUG: KCSAN: data-race in pcpu_alloc_noprof / pcpu_block_update_hint_alloc

read-write to 0xffffffff88bee2ec of 4 bytes by task 8993 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_block_update_hint_alloc+0x5db/0x6a0 mm/percpu.c:923
 pcpu_alloc_area+0x488/0x4b0 mm/percpu.c:1258
 pcpu_alloc_noprof+0x4bb/0x10a0 mm/percpu.c:1834
 perf_trace_event_reg kernel/trace/trace_event_perf.c:121 [inline]
 perf_trace_event_init+0x4d9/0x7c0 kernel/trace/trace_event_perf.c:202
 perf_trace_init+0x159/0x1d0 kernel/trace/trace_event_perf.c:226
 perf_tp_event_init+0x67/0xd0 kernel/events/core.c:10414
 perf_try_init_event+0xcb/0x4f0 kernel/events/core.c:11948
 perf_init_event kernel/events/core.c:12034 [inline]
 perf_event_alloc+0xad1/0x12e0 kernel/events/core.c:12316
 __do_sys_perf_event_open kernel/events/core.c:12838 [inline]
 __se_sys_perf_event_open+0x5ac/0x2230 kernel/events/core.c:12728
 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:12728
 x64_sys_call+0x1deb/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:299
 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

read to 0xffffffff88bee2ec of 4 bytes by task 8983 on cpu 0:
 pcpu_alloc_noprof+0x9b6/0x10a0 mm/percpu.c:1894
 bpf_map_alloc_percpu+0xad/0x210 kernel/bpf/syscall.c:466
 prealloc_init+0x19f/0x470 kernel/bpf/hashtab.c:341
 htab_map_alloc+0x630/0x8e0 kernel/bpf/hashtab.c:579
 map_create+0x850/0xb70 kernel/bpf/syscall.c:1341
 __sys_bpf+0x667/0x7a0 kernel/bpf/syscall.c:5635
 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5758 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5758
 x64_sys_call+0x2914/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:322
 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: 0x00000009 -> 0x00000005

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 8983 Comm: syz.2.2441 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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