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BUG: KCSAN: data-race in __anon_vma_prepare / do_anonymous_page

write to 0xffff88810777ea78 of 8 bytes by task 924 on cpu 1:
 __anon_vma_prepare+0x148/0x2c0 mm/rmap.c:213
 anon_vma_prepare include/linux/rmap.h:159 [inline]
 do_anonymous_page+0x7b4/0xa10 mm/memory.c:4112
 handle_pte_fault mm/memory.c:4953 [inline]
 __handle_mm_fault mm/memory.c:5097 [inline]
 handle_mm_fault+0x88e/0xa80 mm/memory.c:5218
 do_user_addr_fault+0x4a1/0x980 arch/x86/mm/fault.c:1428
 handle_page_fault arch/x86/mm/fault.c:1519 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1575
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffff88810777ea78 of 8 bytes by task 925 on cpu 0:
 anon_vma_prepare include/linux/rmap.h:156 [inline]
 do_anonymous_page+0x124/0xa10 mm/memory.c:4112
 handle_pte_fault mm/memory.c:4953 [inline]
 __handle_mm_fault mm/memory.c:5097 [inline]
 handle_mm_fault+0x88e/0xa80 mm/memory.c:5218
 do_user_addr_fault+0x4a1/0x980 arch/x86/mm/fault.c:1428
 handle_page_fault arch/x86/mm/fault.c:1519 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1575
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
 copy_user_short_string+0xd/0x40 arch/x86/lib/copy_user_64.S:232
 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:34
 copy_to_user include/linux/uaccess.h:169 [inline]
 put_timespec64 kernel/time/time.c:812 [inline]
 put_itimerspec64+0x55/0xf0 kernel/time/time.c:880
 __do_sys_timerfd_gettime fs/timerfd.c:582 [inline]
 __se_sys_timerfd_gettime fs/timerfd.c:576 [inline]
 __x64_sys_timerfd_gettime+0x7c/0xc0 fs/timerfd.c:576
 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 -> 0xffff88810593c0c0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 925 Comm: syz-executor.0 Tainted: G        W          6.1.0-rc5-syzkaller-00241-gab290eaddc4c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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