==================================================================
BUG: KCSAN: data-race in __anon_vma_prepare / handle_mm_fault

write to 0xffff888132cb1c88 of 8 bytes by task 22459 on cpu 0:
 __anon_vma_prepare+0x12f/0x2d0 mm/rmap.c:207
 anon_vma_prepare include/linux/rmap.h:153 [inline]
 do_cow_fault mm/memory.c:4041 [inline]
 do_fault mm/memory.c:4155 [inline]
 handle_pte_fault mm/memory.c:4412 [inline]
 __handle_mm_fault mm/memory.c:4547 [inline]
 handle_mm_fault+0x1749/0x1a70 mm/memory.c:4645
 do_user_addr_fault+0x609/0xc00 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x91/0x230 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577
 __put_user_nocheck_4+0x3/0x11
 __sys_socketpair+0xb2/0x800 net/socket.c:1533
 __do_sys_socketpair net/socket.c:1599 [inline]
 __se_sys_socketpair net/socket.c:1596 [inline]
 __x64_sys_socketpair+0x4e/0x60 net/socket.c:1596
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888132cb1c88 of 8 bytes by task 22428 on cpu 1:
 anon_vma_prepare include/linux/rmap.h:150 [inline]
 do_cow_fault mm/memory.c:4041 [inline]
 do_fault mm/memory.c:4155 [inline]
 handle_pte_fault mm/memory.c:4412 [inline]
 __handle_mm_fault mm/memory.c:4547 [inline]
 handle_mm_fault+0xb6a/0x1a70 mm/memory.c:4645
 do_user_addr_fault+0x609/0xc00 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x91/0x230 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577
 copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:205
 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+0x77/0x90 lib/usercopy.c:33
 copy_to_user include/linux/uaccess.h:200 [inline]
 io_uring_create+0x159f/0x18d0 fs/io_uring.c:9682
 io_uring_setup fs/io_uring.c:9734 [inline]
 __do_sys_io_uring_setup fs/io_uring.c:9740 [inline]
 __se_sys_io_uring_setup fs/io_uring.c:9737 [inline]
 __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9737
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0xffff8881074f5820

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22428 Comm: syz-executor.2 Not tainted 5.13.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================