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BUG: KCSAN: data-race in __anon_vma_prepare / do_anonymous_page

write to 0xffff8881389c8088 of 8 bytes by task 8444 on cpu 0:
 __anon_vma_prepare+0x12c/0x2a0 mm/rmap.c:210
 anon_vma_prepare include/linux/rmap.h:150 [inline]
 do_anonymous_page+0x7c1/0xa10 mm/memory.c:3824
 handle_pte_fault mm/memory.c:4625 [inline]
 __handle_mm_fault mm/memory.c:4763 [inline]
 handle_mm_fault+0x83c/0xa40 mm/memory.c:4861
 do_user_addr_fault+0x4cd/0x940 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x1e/0x30
 copy_user_generic_unrolled+0x89/0xd0
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
 _copy_to_user+0x72/0x90 lib/usercopy.c:33
 copy_to_user include/linux/uaccess.h:160 [inline]
 do_pipe2+0x8c/0x120 fs/pipe.c:1012
 __do_sys_pipe fs/pipe.c:1033 [inline]
 __se_sys_pipe fs/pipe.c:1031 [inline]
 __x64_sys_pipe+0x1d/0x30 fs/pipe.c:1031
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881389c8088 of 8 bytes by task 8443 on cpu 1:
 anon_vma_prepare include/linux/rmap.h:147 [inline]
 do_anonymous_page+0x127/0xa10 mm/memory.c:3824
 handle_pte_fault mm/memory.c:4625 [inline]
 __handle_mm_fault mm/memory.c:4763 [inline]
 handle_mm_fault+0x83c/0xa40 mm/memory.c:4861
 do_user_addr_fault+0x4cd/0x940 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x1e/0x30
 __put_user_nocheck_4+0x3/0x11
 __sys_socketpair+0xb6/0x420 net/socket.c:1606
 __do_sys_socketpair net/socket.c:1672 [inline]
 __se_sys_socketpair net/socket.c:1669 [inline]
 __x64_sys_socketpair+0x4e/0x60 net/socket.c:1669
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0xffff8881055dc550

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8443 Comm: syz-executor.5 Not tainted 5.18.0-rc3-syzkaller-00190-gc00c5e1d157b-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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