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BUG: KCSAN: data-race in __get_user_pages / __get_user_pages

read to 0xffff8881211666d0 of 8 bytes by task 8816 on cpu 0:
 faultin_page mm/gup.c:653 [inline]
 __get_user_pages+0x769/0x1130 mm/gup.c:851
 __get_user_pages_locked mm/gup.c:1029 [inline]
 get_user_pages_remote+0x206/0x3e0 mm/gup.c:1175
 process_vm_rw_single_vec mm/process_vm_access.c:109 [inline]
 process_vm_rw_core.isra.0+0x3a4/0x910 mm/process_vm_access.c:216
 process_vm_rw+0x1c4/0x1e0 mm/process_vm_access.c:284
 __do_sys_process_vm_writev mm/process_vm_access.c:306 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:301 [inline]
 __x64_sys_process_vm_writev+0x8b/0xb0 mm/process_vm_access.c:301
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8881211666d0 of 8 bytes by task 8859 on cpu 1:
 faultin_page mm/gup.c:653 [inline]
 __get_user_pages+0x78b/0x1130 mm/gup.c:851
 __get_user_pages_locked mm/gup.c:1029 [inline]
 get_user_pages_remote+0x206/0x3e0 mm/gup.c:1175
 process_vm_rw_single_vec mm/process_vm_access.c:109 [inline]
 process_vm_rw_core.isra.0+0x3a4/0x910 mm/process_vm_access.c:216
 process_vm_rw+0x1c4/0x1e0 mm/process_vm_access.c:284
 __do_sys_process_vm_writev mm/process_vm_access.c:306 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:301 [inline]
 __x64_sys_process_vm_writev+0x8b/0xb0 mm/process_vm_access.c:301
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8859 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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