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BUG: KCSAN: data-race in __anon_vma_prepare / do_anonymous_page

write to 0xffff888100815748 of 8 bytes by task 8635 on cpu 0:
 __anon_vma_prepare+0x130/0x2c0 mm/rmap.c:208
 anon_vma_prepare include/linux/rmap.h:149 [inline]
 do_anonymous_page+0x7ae/0x8d0 mm/memory.c:3758
 handle_pte_fault mm/memory.c:4549 [inline]
 __handle_mm_fault mm/memory.c:4686 [inline]
 handle_mm_fault+0x814/0x1590 mm/memory.c:4784
 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1485 [inline]
 exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1541
 asm_exc_page_fault+0x1e/0x30
 __put_user_nocheck_4+0x3/0x11
 __sys_socketpair+0xc4/0x810 net/socket.c:1602
 __do_sys_socketpair net/socket.c:1668 [inline]
 __se_sys_socketpair net/socket.c:1665 [inline]
 __x64_sys_socketpair+0x4e/0x60 net/socket.c:1665
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888100815748 of 8 bytes by task 8628 on cpu 1:
 anon_vma_prepare include/linux/rmap.h:146 [inline]
 do_anonymous_page+0x12c/0x8d0 mm/memory.c:3758
 handle_pte_fault mm/memory.c:4549 [inline]
 __handle_mm_fault mm/memory.c:4686 [inline]
 handle_mm_fault+0x814/0x1590 mm/memory.c:4784
 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1485 [inline]
 exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1541
 asm_exc_page_fault+0x1e/0x30

value changed: 0x0000000000000000 -> 0xffff88811a3c3690

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8628 Comm: syz-executor.4 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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