syzbot

==================================================================
BUG: KCSAN: data-race in copy_mm / copy_page_range

write to 0xffff8881043d2ee8 of 8 bytes by task 9568 on cpu 1:
 __list_add include/linux/list.h:153 [inline]
 list_add include/linux/list.h:169 [inline]
 copy_nonpresent_pte mm/memory.c:815 [inline]
 copy_pte_range mm/memory.c:1155 [inline]
 copy_pmd_range mm/memory.c:1267 [inline]
 copy_pud_range mm/memory.c:1304 [inline]
 copy_p4d_range mm/memory.c:1328 [inline]
 copy_page_range+0x27a6/0x3ac0 mm/memory.c:1416
 dup_mmap+0x885/0xf20 mm/mmap.c:1838
 dup_mm kernel/fork.c:1477 [inline]
 copy_mm+0x11a/0x370 kernel/fork.c:1529
 copy_process+0xcf1/0x1fe0 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

read to 0xffff8881043d2e00 of 1408 bytes by task 3311 on cpu 0:
 dup_mm kernel/fork.c:1471 [inline]
 copy_mm+0xe2/0x370 kernel/fork.c:1529
 copy_process+0xcf1/0x1fe0 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: 3311 Comm: syz-executor Not tainted 6.16.0-rc2-syzkaller-00318-g739a6c93cc75 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
==================================================================