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BUG: KCSAN: data-race in __anon_vma_prepare / wp_page_copy

write to 0xffff88813236c388 of 8 bytes by task 25154 on cpu 1:
 __anon_vma_prepare+0x12f/0x2d0 mm/rmap.c:207
 anon_vma_prepare include/linux/rmap.h:152 [inline]
 wp_page_copy+0xb06/0x10c0 mm/memory.c:2887
 do_wp_page+0x5a8/0xba0 include/linux/spinlock_api_smp.h:152
 handle_pte_fault mm/memory.c:4389 [inline]
 __handle_mm_fault mm/memory.c:4506 [inline]
 handle_mm_fault+0xb31/0x1a70 mm/memory.c:4604
 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x94/0x230 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577

read to 0xffff88813236c388 of 8 bytes by task 25156 on cpu 0:
 anon_vma_prepare include/linux/rmap.h:149 [inline]
 wp_page_copy+0x5f/0x10c0 mm/memory.c:2887
 do_wp_page+0x5a8/0xba0 include/linux/spinlock_api_smp.h:152
 handle_pte_fault mm/memory.c:4389 [inline]
 __handle_mm_fault mm/memory.c:4506 [inline]
 handle_mm_fault+0xb31/0x1a70 mm/memory.c:4604
 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x94/0x230 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577

value changed: 0x0000000000000000 -> 0xffff888107e1f460

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25156 Comm: syz-executor.0 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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