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BUG: KCSAN: data-race in __anon_vma_prepare / handle_mm_fault

write to 0xffff88811bc035b0 of 8 bytes by task 13996 on cpu 1:
 __anon_vma_prepare+0x147/0x2b0 mm/rmap.c:214
 anon_vma_prepare include/linux/rmap.h:164 [inline]
 do_anonymous_page mm/memory.c:4269 [inline]
 do_pte_missing mm/memory.c:3743 [inline]
 handle_pte_fault mm/memory.c:5144 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0x2248/0x27b0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1415 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x2f7/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:57
 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline]
 _copy_to_user+0x77/0x90 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:191 [inline]
 put_timespec64 kernel/time/time.c:910 [inline]
 put_itimerspec64+0x69/0x120 kernel/time/time.c:1012
 __do_sys_timerfd_gettime fs/timerfd.c:582 [inline]
 __se_sys_timerfd_gettime fs/timerfd.c:576 [inline]
 __x64_sys_timerfd_gettime+0x80/0xc0 fs/timerfd.c:576
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88811bc035b0 of 8 bytes by task 13995 on cpu 0:
 anon_vma_prepare include/linux/rmap.h:161 [inline]
 do_anonymous_page mm/memory.c:4269 [inline]
 do_pte_missing mm/memory.c:3743 [inline]
 handle_pte_fault mm/memory.c:5144 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0xcc0/0x27b0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1415 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x2f7/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x0000000000000000 -> 0xffff8881031d7548

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13995 Comm: syz-executor.1 Not tainted 6.8.0-rc1-syzkaller-00331-gcd2286fc5775 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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