cp (GNU coreutils) 8.32
CentOS Linux release 7.4.1708 (Core)
kernel 3.10.0-693.17.1.el7.x86_64

I have identified an issue with "cp" where, if more than 2 TiB of data is being copied, and progress reporting is on, after 2 TiB has been copied the time remaining overflows.

The output goes like this:

728 files copied so far...                                   2.0 TiB /   4.9 TiB
[============================>                                          ] 41.0 %
Copying at 206.2 MiB/s (about 4h 25m 44s remaining)
...127TE.RDM/A018_A007_0127H2.RDC/A018_A007_0127H2_004.R3D   1.6 GiB /   3.8 GiB
[=============================>                                         ] 42.1 %
728 files copied so far...                                   2.0 TiB /   4.9 TiB
[============================>                                          ] 41.0 %
Copying at 203.1 MiB/s (about 4294967286h 4294967261m 4294967249s remaining)
...127TE.RDM/A018_A007_0127H2.RDC/A018_A007_0127H2_004.R3D   1.7 GiB /   3.8 GiB
[===============================>                                       ] 44.7 %

This is "cp -argu <sourcedir> <destdir>". The source tree contains more than 2TiB worth of data.

I believe the issue is in src/copy.c where (on line 355) an INT is used to store "cur_size".

    int cur_size = g_iTotalWritten + *total_n_read / 1024;

When dealing with filesizes and capacities, the largest possible type should be used, which I believe is a unsigned long long (or __uint64_t).