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BUG: KCSAN: data-race in __percpu_counter_init_many / copy_mm

write to 0xffff88813b3f8c78 of 8 bytes by task 20807 on cpu 1:
 __list_add include/linux/list.h:161 [inline]
 list_add include/linux/list.h:177 [inline]
 __percpu_counter_init_many+0x297/0x320 lib/percpu_counter.c:220
 mm_init+0x50c/0x650 kernel/fork.c:1136
 mm_alloc+0x53/0x70 kernel/fork.c:1170
 bprm_mm_init fs/exec.c:262 [inline]
 alloc_bprm+0x22a/0x430 fs/exec.c:1487
 class_bprm_constructor fs/exec.c:1497 [inline]
 kernel_execve+0x6a/0x630 fs/exec.c:1889
 call_usermodehelper_exec_async+0x196/0x250 kernel/umh.c:109
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88813b3f8700 of 1728 bytes by task 20809 on cpu 0:
 dup_mm kernel/fork.c:1532 [inline]
 copy_mm+0xd6/0x340 kernel/fork.c:1590
 copy_process+0x10cd/0x2350 kernel/fork.c:2288
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2746
 __do_sys_clone kernel/fork.c:2887 [inline]
 __se_sys_clone kernel/fork.c:2871 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2871
 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+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 20809 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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