Description of problem:
ps axf on a update shows

3542 pts/2    Ss     0:00  \_ /bin/bash
 3768 pts/2    S+     1:44  |   \_ /usr/libexec/system-python /usr/bin/dnf update --enablerepo=updates-testing --releasever=26
 6566 pts/3    Ss+    0:00  \_ /bin/bash

the dnf process has gone to sleep. I have had this on almost every single system I have updated from f25 to f26 

attaching strace to the process gives
[root@ipa3 ~]# strace -p 3768
strace: Process 3768 attached
futex(0x7f59bddd42f0, FUTEX_WAIT_PRIVATE, 2, NULL

the only way forward has been to kill the update and start it over and clean up 

Upgrading   : libssh2-1.8.0-2.fc26.x86_64                                                                                                                                                               403/2886
  Upgrading   : nmap-ncat-2:7.40-2.fc26.x86_64                                                                                                                                                            404/2886
is the output from dnf

4616 ?        SNs    0:00 /usr/libexec/system-python /usr/bin/dnf makecache timer
is running and has gone to sleep also 


the last lines in dnf.rpm.log is 
Apr 18 22:37:03 INFO Upgraded: libarchive-3.2.2-3.fc26.x86_64
Apr 18 22:37:10 INFO Upgraded: libssh2-1.8.0-2.fc26.x86_64

Version-Release number of selected component (if applicable):


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