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BUG: KCSAN: data-race in __anon_vma_prepare / __vmf_anon_prepare

write to 0xffff88813509a700 of 8 bytes by task 25542 on cpu 0:
 __anon_vma_prepare+0x172/0x2f0 mm/rmap.c:212
 __vmf_anon_prepare+0x91/0x100 mm/memory.c:3829
 hugetlb_no_page+0x1b8/0xf30 mm/hugetlb.c:5756
 hugetlb_fault+0x608/0xda0 mm/hugetlb.c:-1
 handle_mm_fault+0x1de9/0x2da0 mm/memory.c:6684
 do_user_addr_fault+0x634/0x1060 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595

read to 0xffff88813509a700 of 8 bytes by task 25544 on cpu 1:
 __vmf_anon_prepare+0x26/0x100 mm/memory.c:3823
 hugetlb_no_page+0x1b8/0xf30 mm/hugetlb.c:5756
 hugetlb_fault+0x608/0xda0 mm/hugetlb.c:-1
 handle_mm_fault+0x1de9/0x2da0 mm/memory.c:6684
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x129c/0x1f10 mm/gup.c:1428
 __get_user_pages_locked mm/gup.c:1692 [inline]
 __gup_longterm_locked+0x905/0xe30 mm/gup.c:2476
 pin_user_pages_remote+0x7e/0xb0 mm/gup.c:3352
 process_vm_rw_single_vec mm/process_vm_access.c:106 [inline]
 process_vm_rw_core mm/process_vm_access.c:216 [inline]
 process_vm_rw+0x49b/0x9c0 mm/process_vm_access.c:284
 __do_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
 __se_sys_process_vm_readv mm/process_vm_access.c:292 [inline]
 __x64_sys_process_vm_readv+0x78/0x90 mm/process_vm_access.c:292
 x64_sys_call+0x282e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:311
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff888104af24e0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 25544 Comm: syz.2.6062 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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