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BUG: KCSAN: data-race in __anon_vma_prepare / handle_mm_fault

write to 0xffff888108917400 of 8 bytes by task 4809 on cpu 1:
 __anon_vma_prepare+0x172/0x2f0 mm/rmap.c:213
 __vmf_anon_prepare mm/memory.c:3523 [inline]
 vmf_anon_prepare mm/internal.h:410 [inline]
 do_anonymous_page mm/memory.c:5067 [inline]
 do_pte_missing mm/memory.c:4249 [inline]
 handle_pte_fault mm/memory.c:6069 [inline]
 __handle_mm_fault mm/memory.c:6212 [inline]
 handle_mm_fault+0x1d19/0x2be0 mm/memory.c:6381
 do_user_addr_fault+0x3fe/0x1090 arch/x86/mm/fault.c:1387
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
 __put_user_4+0xd/0x20 arch/x86/lib/putuser.S:92
 __sys_socketpair+0xa6/0x430 net/socket.c:1733
 __do_sys_socketpair net/socket.c:1799 [inline]
 __se_sys_socketpair net/socket.c:1796 [inline]
 __x64_sys_socketpair+0x52/0x60 net/socket.c:1796
 x64_sys_call+0x23f2/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:54
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888108917400 of 8 bytes by task 4808 on cpu 0:
 __vmf_anon_prepare mm/memory.c:3517 [inline]
 vmf_anon_prepare mm/internal.h:410 [inline]
 do_anonymous_page mm/memory.c:5067 [inline]
 do_pte_missing mm/memory.c:4249 [inline]
 handle_pte_fault mm/memory.c:6069 [inline]
 __handle_mm_fault mm/memory.c:6212 [inline]
 handle_mm_fault+0xe8e/0x2be0 mm/memory.c:6381
 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x0000000000000000 -> 0xffff888103e66d68

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4808 Comm: syz.2.4090 Tainted: G        W           6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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