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BUG: KCSAN: data-race in __get_user_pages / __get_user_pages

write to 0xffff888080457690 of 8 bytes by task 3197 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_unlocked+0x103/0x520 mm/gup.c:2082
 __gup_longterm_unlocked mm/gup.c:2732 [inline]
 internal_get_user_pages_fast+0xf04/0x1180 mm/gup.c:2805
 get_user_pages_fast+0x46/0x60 mm/gup.c:2901
 iov_iter_get_pages+0x1b0/0x920 lib/iov_iter.c:1323
 __bio_iov_iter_get_pages+0x8c/0x380 block/bio.c:1010
 bio_iov_iter_get_pages+0x1c0/0x3c0 block/bio.c:1115
 __blkdev_direct_IO fs/block_dev.c:385 [inline]
 blkdev_direct_IO+0x657/0xfa0 fs/block_dev.c:475
 generic_file_read_iter+0x2be/0x3e0 mm/filemap.c:2305
 blkdev_read_iter+0xb3/0xc0 fs/block_dev.c:2044
 call_read_iter include/linux/fs.h:1902 [inline]
 aio_read+0x1e1/0x2a0 fs/aio.c:1543
 __io_submit_one fs/aio.c:1840 [inline]
 io_submit_one+0x47f/0xe10 fs/aio.c:1885
 __do_sys_io_submit fs/aio.c:1944 [inline]
 __se_sys_io_submit+0xf5/0x250 fs/aio.c:1914
 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:1914
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888080457690 of 8 bytes by task 3200 on cpu 0:
 faultin_page mm/gup.c:900 [inline]
 __get_user_pages+0xb18/0x1150 mm/gup.c:1113
 __get_user_pages_locked mm/gup.c:1306 [inline]
 __get_user_pages_remote+0x113/0x500 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3200 Comm: syz-executor.1 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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