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BUG: KCSAN: data-race in __anon_vma_prepare / do_anonymous_page

write to 0xffff8881046acec8 of 8 bytes by task 13494 on cpu 1:
 __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+0x27/0x30
 copy_user_enhanced_fast_string+0xa/0x40
 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]
 copy_semid_to_user ipc/sem.c:1200 [inline]
 ksys_semctl ipc/sem.c:1675 [inline]
 __do_sys_semctl ipc/sem.c:1709 [inline]
 __se_sys_semctl+0x16b/0x220 ipc/sem.c:1707
 __x64_sys_semctl+0x51/0x60 ipc/sem.c:1707
 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+0x46/0xb0

read to 0xffff8881046acec8 of 8 bytes by task 13489 on cpu 0:
 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+0x27/0x30
 copy_user_enhanced_fast_string+0xa/0x40
 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]
 copy_semid_to_user ipc/sem.c:1200 [inline]
 ksys_semctl ipc/sem.c:1675 [inline]
 __do_sys_semctl ipc/sem.c:1709 [inline]
 __se_sys_semctl+0x16b/0x220 ipc/sem.c:1707
 __x64_sys_semctl+0x51/0x60 ipc/sem.c:1707
 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+0x46/0xb0

value changed: 0x0000000000000000 -> 0xffff888104652370

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13489 Comm: syz-executor.4 Not tainted 5.18.0-syzkaller-01157-g143a6252e1b8-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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