Will,
I also have nbu 7.7.1 on RHEL6, and didn't see the same issue as you did
# nbdeployutil --gather
NetBackup Deployment Utility, version 7.7.1
Gathering license deployment information...
Discovered master server nbu1
co Output for nbu1 at: /usr/openv/var/global/reports/20160229_185656_nbu1
Gather DONE
Execution time: 1 min 9 secs
To create a report for this master server, run one of the following:
capacity : nbdeployutil --report --capacity /usr/openv/var/global/reports/20160229_185656_nbu1
traditional: nbdeployutil --report --traditional /usr/openv/var/global/reports/20160229_185656_nbu1
# uname -a
Linux nbu1 2.6.32-573.el6.x86_64 #1 SMP Wed Jul 1 18:23:37 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux
# cat /etc/*elease|tail -1
Red Hat Enterprise Linux Server release 6.7 (Santiago)
# cat /usr/openv/netbackup/bin/version
NetBackup-RedHat2.6.18 7.7.1
# ls -ld /tmp
drwxrwxrwt 8 root root 4096 Feb 29 18:58 /tmp
# df -k /tmp
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_nbu1-lv_root
51475068 8937204 39916424 19% /