syzbot

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BUG: KCSAN: data-race in __percpu_counter_init_many / copy_mm

write to 0xffff8881049dd608 of 8 bytes by task 5414 on cpu 1:
 __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:1127
 mm_alloc+0x80/0xa0 kernel/fork.c:1162
 bprm_mm_init fs/exec.c:261 [inline]
 alloc_bprm+0x20e/0x350 fs/exec.c:1457
 class_bprm_constructor fs/exec.c:1466 [inline]
 kernel_execve+0x6a/0x630 fs/exec.c:1859
 call_usermodehelper_exec_async+0x196/0x250 kernel/umh.c:109
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff8881049dd100 of 1664 bytes by task 5406 on cpu 0:
 dup_mm kernel/fork.c:1524 [inline]
 copy_mm+0xe1/0x370 kernel/fork.c:1582
 copy_process+0xe22/0x20d0 kernel/fork.c:2223
 kernel_clone+0x16b/0x5d0 kernel/fork.c:2654
 __do_sys_clone kernel/fork.c:2795 [inline]
 __se_sys_clone kernel/fork.c:2779 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2779
 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/0x370 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: 5406 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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