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BUG: KCSAN: data-race in copy_mm / percpu_counter_destroy_many

write to 0xffff8881037dd0d8 of 8 bytes by task 16785 on cpu 1:
 __list_del include/linux/list.h:195 [inline]
 __list_del_entry include/linux/list.h:218 [inline]
 list_del include/linux/list.h:229 [inline]
 percpu_counter_destroy_many+0xc7/0x2b0 lib/percpu_counter.c:244
 __mmdrop+0x22e/0x350 kernel/fork.c:688
 mmdrop include/linux/sched/mm.h:55 [inline]
 mmdrop_lazy_tlb include/linux/sched/mm.h:97 [inline]
 exec_mmap+0x469/0x4d0 fs/exec.c:904
 begin_new_exec+0xb6b/0x1160 fs/exec.c:1156
 load_elf_binary+0x5ff/0x19d0 fs/binfmt_elf.c:995
 search_binary_handler fs/exec.c:1670 [inline]
 exec_binprm fs/exec.c:1702 [inline]
 bprm_execve+0x474/0x970 fs/exec.c:1754
 kernel_execve+0x617/0x660 fs/exec.c:1920
 call_usermodehelper_exec_async+0x197/0x250 kernel/umh.c:109
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff8881037dcd00 of 1344 bytes by task 16781 on cpu 0:
 dup_mm kernel/fork.c:1471 [inline]
 copy_mm+0xe2/0x370 kernel/fork.c:1529
 copy_process+0xcf1/0x1f90 kernel/fork.c:2169
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2599
 __do_sys_clone kernel/fork.c:2742 [inline]
 __se_sys_clone kernel/fork.c:2726 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2726
 x64_sys_call+0x2c59/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 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: 16781 Comm: syz-executor Not tainted 6.16.0-rc7-syzkaller-00105-g2942242dde89 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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