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BUG: KCSAN: data-race in __percpu_counter_init_many / copy_mm

write to 0xffff888129983b18 of 8 bytes by task 5176 on cpu 0:
 __list_add include/linux/list.h:161 [inline]
 list_add include/linux/list.h:177 [inline]
 __percpu_counter_init_many+0x292/0x310 lib/percpu_counter.c:220
 mm_init+0x505/0x680 kernel/fork.c:1131
 dup_mm kernel/fork.c:1530 [inline]
 copy_mm+0x100/0x370 kernel/fork.c:1586
 copy_process+0x1087/0x2370 kernel/fork.c:2264
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2722
 __do_sys_clone kernel/fork.c:2863 [inline]
 __se_sys_clone kernel/fork.c:2847 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2847
 x64_sys_call+0x1222/0x3020 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888129983600 of 1664 bytes by task 5652 on cpu 1:
 dup_mm kernel/fork.c:1528 [inline]
 copy_mm+0xe1/0x370 kernel/fork.c:1586
 copy_process+0x1087/0x2370 kernel/fork.c:2264
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2722
 __do_sys_clone kernel/fork.c:2863 [inline]
 __se_sys_clone kernel/fork.c:2847 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2847
 x64_sys_call+0x1222/0x3020 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5652 Comm: dhcpcd-run-hook Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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