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BUG: KCSAN: data-race in __anon_vma_prepare / handle_mm_fault

write to 0xffff888104086f68 of 8 bytes by task 18719 on cpu 0:
 __anon_vma_prepare+0x180/0x310 mm/rmap.c:214
 __vmf_anon_prepare mm/memory.c:3307 [inline]
 vmf_anon_prepare mm/internal.h:371 [inline]
 do_anonymous_page mm/memory.c:4780 [inline]
 do_pte_missing mm/memory.c:3963 [inline]
 handle_pte_fault mm/memory.c:5766 [inline]
 __handle_mm_fault mm/memory.c:5909 [inline]
 handle_mm_fault+0x1c5d/0x2aa0 mm/memory.c:6077
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
 __put_user_4+0x11/0x20 arch/x86/lib/putuser.S:86
 __sys_socketpair+0xba/0x430 net/socket.c:1748
 __do_sys_socketpair net/socket.c:1814 [inline]
 __se_sys_socketpair net/socket.c:1811 [inline]
 __x64_sys_socketpair+0x52/0x60 net/socket.c:1811
 x64_sys_call+0x1cad/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:54
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888104086f68 of 8 bytes by task 18717 on cpu 1:
 __vmf_anon_prepare mm/memory.c:3301 [inline]
 vmf_anon_prepare mm/internal.h:371 [inline]
 do_anonymous_page mm/memory.c:4780 [inline]
 do_pte_missing mm/memory.c:3963 [inline]
 handle_pte_fault mm/memory.c:5766 [inline]
 __handle_mm_fault mm/memory.c:5909 [inline]
 handle_mm_fault+0xd87/0x2aa0 mm/memory.c:6077
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x0000000000000000 -> 0xffff8881049e3b60

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 18717 Comm: syz.3.5618 Tainted: G        W          6.12.0-syzkaller-01892-g8f7c8b88bda4 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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