Description of problem:
dnf failed with '“sudo dnf update” terminated by signal SIGFPE (Floating point exception)'

Version-Release number of selected component (if applicable):
$ rpm -q dnf
dnf-2.5.0-1.fc26.noarch
dnf-2.5.0-2.fc26.noarch

How reproducible:
No idea.

Steps to Reproduce:
1. Run 'sudo dnf update' in terminal

Actual results:
fish: “sudo dnf update” terminated by signal SIGFPE (Floating point exception)

Expected results:
No errors.

Additional info:
Last few lines from the 'dnf update' output:
```
  Cleanup          : texlive-uplatex-6:svn41370-33.fc26.1.noarch                                                                                                                                                                     4613/6582 
  Cleanup          : texlive-zxjafbfont-6:svn28539.0.2-33.fc26.1.noarch                                                                                                                                                              4614/6582 
  Cleanup          : texlive-xecjk-6:svn41129-33.fc26.1.noarch                                                                                                                                                                       4615/6582 
  Cleanup          : texlive-cjk-6:svn36951.4.8.4-33.fc26.1.noarch                                                                                                                                                                   4616/6582 
  Cleanup          : texlive-garuda-c90-6:svn37677.0-33.fc26.1.noarch                                                                                                                                                                4617/6582 
  Cleanup          : texlive-norasi-c90-6:svn37675.0-33.fc26.1.noarch                                                                                                                                                                4618/6582 
  Cleanup          : texlive-fonts-tlwg-6:svn41366-33.fc26.1.noarch                                                                                                                                                                  4619/6582 
  Cleanup          : texlive-arphic-6:svn15878.0-33.fc26.1.noarch                                                                                                                                                                    4620/6582 
  Cleanup          : texlive-uhc-6:svn16791.0-33.fc26.1.noarch                                                                                                                                                                       4621/6582 
fish: “sudo dnf update” terminated by signal SIGFPE (Floating point exception)
~/org $ sudo dnf update
fish: “sudo dnf update” terminated by signal SIGSEGV (Address boundary error)
~/org $ sudo dnf update
fish: “sudo dnf update” terminated by signal SIGSEGV (Address boundary error)
~/org $ sudo dnf clean all
fish: “sudo dnf clean all” terminated by signal SIGSEGV (Address boundary error)
~/org $ sudo dnf help
error: rpmdb: BDB0113 Thread/process 14080/140145461462784 failed: BDB1507 Thread died in Berkeley DB library
error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery
error: cannot open Packages index using db5 -  (-30973)
error: cannot open Packages database in /var/lib/rpm
Error: Error: rpmdb open failed
```