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BUG: KCSAN: data-race in copy_mm / vma_complete

read-write to 0xffff88810b36d948 of 4 bytes by task 8104 on cpu 1:
 vma_complete+0x13f/0x580 mm/vma.c:349
 __split_vma+0x59b/0x660 mm/vma.c:561
 split_vma mm/vma.c:591 [inline]
 vma_modify+0xb53/0xd50 mm/vma.c:1626
 vma_modify_flags+0x10c/0x190 mm/vma.c:1654
 mprotect_fixup+0x30f/0x5e0 mm/mprotect.c:756
 do_mprotect_pkey+0x6d6/0x980 mm/mprotect.c:930
 __do_sys_mprotect mm/mprotect.c:951 [inline]
 __se_sys_mprotect mm/mprotect.c:948 [inline]
 __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:948
 x64_sys_call+0x2c3b/0x3000 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810b36d7c0 of 1664 bytes by task 8105 on cpu 0:
 dup_mm kernel/fork.c:1523 [inline]
 copy_mm+0xe2/0x370 kernel/fork.c:1581
 copy_process+0xcbc/0x1ef0 kernel/fork.c:2221
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2651
 __do_sys_clone kernel/fork.c:2792 [inline]
 __se_sys_clone kernel/fork.c:2776 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2776
 x64_sys_call+0x12d0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 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: 8105 Comm: syz.1.924 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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