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BUG: KCSAN: data-race in __get_user_pages / __get_user_pages

write to 0xffff88809f0b4610 of 8 bytes by task 8137 on cpu 1:
 faultin_page mm/gup.c:672 [inline]
 __get_user_pages+0x78e/0x1140 mm/gup.c:870
 __get_user_pages_locked mm/gup.c:1057 [inline]
 get_user_pages_remote+0x22c/0x450 mm/gup.c:1654
 pin_user_pages_remote+0x4a/0x70 mm/gup.c:2551
 process_vm_rw_single_vec mm/process_vm_access.c:108 [inline]
 process_vm_rw_core.isra.0+0x34d/0x760 mm/process_vm_access.c:218
 process_vm_rw+0x1c4/0x1e0 mm/process_vm_access.c:286
 __do_sys_process_vm_writev mm/process_vm_access.c:308 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:303 [inline]
 __x64_sys_process_vm_writev+0x80/0xa0 mm/process_vm_access.c:303
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88809f0b4610 of 8 bytes by task 8080 on cpu 0:
 faultin_page mm/gup.c:672 [inline]
 __get_user_pages+0x76f/0x1140 mm/gup.c:870
 __get_user_pages_locked mm/gup.c:1057 [inline]
 get_user_pages_remote+0x22c/0x450 mm/gup.c:1654
 pin_user_pages_remote+0x4a/0x70 mm/gup.c:2551
 process_vm_rw_single_vec mm/process_vm_access.c:108 [inline]
 process_vm_rw_core.isra.0+0x34d/0x760 mm/process_vm_access.c:218
 process_vm_rw+0x1c4/0x1e0 mm/process_vm_access.c:286
 __do_sys_process_vm_writev mm/process_vm_access.c:308 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:303 [inline]
 __x64_sys_process_vm_writev+0x80/0xa0 mm/process_vm_access.c:303
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8080 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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