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BUG: KCSAN: data-race in __anon_vma_prepare / do_anonymous_page

write to 0xffff8881061ee748 of 8 bytes by task 6914 on cpu 1:
 __anon_vma_prepare+0x14e/0x2d0 mm/rmap.c:213
 anon_vma_prepare include/linux/rmap.h:159 [inline]
 do_anonymous_page+0x7ba/0xa20 mm/memory.c:4082
 handle_pte_fault mm/memory.c:4909 [inline]
 __handle_mm_fault mm/memory.c:5053 [inline]
 handle_mm_fault+0x8a0/0xa90 mm/memory.c:5151
 do_user_addr_fault+0x4a1/0x980 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1488 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1544
 asm_exc_page_fault+0x22/0x30
 __put_user_nocheck_4+0x3/0x11
 pep_ioctl+0x34a/0x390 net/phonet/pep.c:942
 pn_socket_ioctl+0x8f/0x210 net/phonet/socket.c:390
 sock_do_ioctl+0x7d/0x250 net/socket.c:1169
 sock_ioctl+0x343/0x570 net/socket.c:1286
 vfs_ioctl fs/ioctl.c:51 [inline]
 do_vfs_ioctl+0x781/0x1390 fs/ioctl.c:830
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x83/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 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+0x63/0xcd

read to 0xffff8881061ee748 of 8 bytes by task 6915 on cpu 0:
 anon_vma_prepare include/linux/rmap.h:156 [inline]
 do_anonymous_page+0x127/0xa20 mm/memory.c:4082
 handle_pte_fault mm/memory.c:4909 [inline]
 __handle_mm_fault mm/memory.c:5053 [inline]
 handle_mm_fault+0x8a0/0xa90 mm/memory.c:5151
 do_user_addr_fault+0x4a1/0x980 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1488 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1544
 asm_exc_page_fault+0x22/0x30
 __put_user_nocheck_4+0x3/0x11
 __sys_socketpair+0xb6/0x420 net/socket.c:1685
 __do_sys_socketpair net/socket.c:1751 [inline]
 __se_sys_socketpair net/socket.c:1748 [inline]
 __x64_sys_socketpair+0x4e/0x60 net/socket.c:1748
 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+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff88810468a3c0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6915 Comm: syz-executor.3 Not tainted 6.0.0-rc6-syzkaller-00045-gdc164f4fb00a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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