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BUG: KCSAN: data-race in lock_vma_under_rcu / vma_prepare

read to 0xffff888104943568 of 4 bytes by task 3096 on cpu 0:
 vma_start_read include/linux/mm.h:645 [inline]
 lock_vma_under_rcu+0xeb/0x2b0 mm/memory.c:5400
 do_user_addr_fault arch/x86/mm/fault.c:1335 [inline]
 handle_page_fault arch/x86/mm/fault.c:1486 [inline]
 exc_page_fault+0x160/0x650 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

write to 0xffff888104943568 of 4 bytes by task 17348 on cpu 1:
 vma_start_write include/linux/mm.h:691 [inline]
 vma_prepare+0x85/0x520 mm/mmap.c:477
 vma_expand+0x180/0x340 mm/mmap.c:668
 mmap_region+0xc34/0x14d0 mm/mmap.c:2715
 do_mmap+0x69c/0xaa0 mm/mmap.c:1362
 vm_mmap_pgoff+0x12f/0x240 mm/util.c:543
 ksys_mmap_pgoff+0xc5/0x330 mm/mmap.c:1408
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17348 Comm: syz-fuzzer Not tainted 6.5.0-rc2-syzkaller-00184-g57f1f9dd3abe #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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