==================================================================
BUG: KCSAN: data-race in __get_user_pages / __get_user_pages

write to 0xffff888121a2f610 of 8 bytes by task 30143 on cpu 1:
 faultin_page mm/gup.c:900 [inline]
 __get_user_pages+0xb26/0x1150 mm/gup.c:1113
 __get_user_pages_locked mm/gup.c:1306 [inline]
 __get_user_pages_remote+0x374/0x500 mm/gup.c:1857
 pin_user_pages_remote+0x5e/0x80 mm/gup.c:3004
 process_vm_rw_single_vec mm/process_vm_access.c:108 [inline]
 process_vm_rw_core+0x369/0x760 mm/process_vm_access.c:218
 process_vm_rw+0x14e/0x1d0 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+0x76/0x90 mm/process_vm_access.c:303
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888121a2f610 of 8 bytes by task 30126 on cpu 0:
 faultin_page mm/gup.c:900 [inline]
 __get_user_pages+0xb18/0x1150 mm/gup.c:1113
 populate_vma_page_range mm/gup.c:1452 [inline]
 __mm_populate+0x256/0x340 mm/gup.c:1500
 mm_populate include/linux/mm.h:2605 [inline]
 vm_mmap_pgoff+0x13b/0x170 mm/util.c:511
 ksys_mmap_pgoff+0xdf/0x3a0 mm/mmap.c:1595
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 30126 Comm: syz-executor.5 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================