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BUG: KCSAN: data-race in copy_page_from_iter / copy_page_from_iter

write to 0xffff888080d6f000 of 4096 bytes by task 2945 on cpu 1:
 instrument_copy_from_user include/linux/instrumented.h:106 [inline]
 copyin lib/iov_iter.c:151 [inline]
 copy_page_from_iter_iovec lib/iov_iter.c:296 [inline]
 copy_page_from_iter+0x31f/0x5a0 lib/iov_iter.c:942
 process_vm_rw_pages mm/process_vm_access.c:46 [inline]
 process_vm_rw_single_vec mm/process_vm_access.c:120 [inline]
 process_vm_rw_core+0x478/0x760 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

write to 0xffff888080d6f000 of 4096 bytes by task 2947 on cpu 0:
 instrument_copy_from_user include/linux/instrumented.h:106 [inline]
 copyin lib/iov_iter.c:151 [inline]
 copy_page_from_iter_iovec lib/iov_iter.c:296 [inline]
 copy_page_from_iter+0x31f/0x5a0 lib/iov_iter.c:942
 process_vm_rw_pages mm/process_vm_access.c:46 [inline]
 process_vm_rw_single_vec mm/process_vm_access.c:120 [inline]
 process_vm_rw_core+0x478/0x760 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: 2947 Comm: syz-executor.3 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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