==================================================================
BUG: KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc

read-write to 0xffffffff884034dc of 4 bytes by task 14186 on cpu 0:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_block_update_hint_alloc+0x5db/0x6a0 mm/percpu.c:923
 pcpu_alloc_area+0x49f/0x4d0 mm/percpu.c:1258
 pcpu_alloc+0x4b3/0x10d0 mm/percpu.c:1808
 __alloc_percpu+0x24/0x30 mm/percpu.c:1943
 perf_trace_event_reg kernel/trace/trace_event_perf.c:121 [inline]
 perf_trace_event_init+0x500/0x7a0 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:10102
 perf_try_init_event+0xc3/0x2b0 kernel/events/core.c:11668
 perf_init_event kernel/events/core.c:11738 [inline]
 perf_event_alloc+0x9f0/0x1720 kernel/events/core.c:12018
 __do_sys_perf_event_open kernel/events/core.c:12525 [inline]
 __se_sys_perf_event_open+0x837/0x2170 kernel/events/core.c:12416
 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:12416
 x64_sys_call+0x26e5/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:299
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff884034dc of 4 bytes by task 10439 on cpu 1:
 pcpu_alloc+0x9aa/0x10d0 mm/percpu.c:1868
 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930
 __percpu_counter_init_many+0x3c/0x1f0 lib/percpu_counter.c:164
 mm_init+0x59d/0x6d0 kernel/fork.c:1303
 dup_mm kernel/fork.c:1684 [inline]
 copy_mm+0x120/0x1070 kernel/fork.c:1736
 copy_process+0xee1/0x1f80 kernel/fork.c:2389
 kernel_clone+0x16a/0x570 kernel/fork.c:2796
 __do_sys_clone kernel/fork.c:2939 [inline]
 __se_sys_clone kernel/fork.c:2923 [inline]
 __x64_sys_clone+0xe8/0x120 kernel/fork.c:2923
 x64_sys_call+0x23cb/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000033 -> 0x0000002f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10439 Comm: syz-executor.0 Not tainted 6.9.0-rc4-syzkaller-00031-g96fca68c4fbf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
==================================================================