Description of problem:
Run following command as root:
virsh -c qemu+libssh://localhost/system list

Version-Release number of selected component:
libvirt-client-2.5.0-3.fc26

Additional info:
reporter:       libreport-2.9.0
backtrace_rating: 4
cmdline:        virsh -c qemu+libssh://localhost/system list
crash_function: strlen
executable:     /usr/bin/virsh
global_pid:     14433
kernel:         4.10.0-0.rc2.git2.1.fc26.x86_64
runlevel:       N 5
type:           CCpp
uid:            0

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 strlen at ../sysdeps/x86_64/strlen.S:106
 #1 __strdup at strdup.c:41
 #2 ssh_path_expand_escape at /usr/src/debug/libssh-0.7.3/src/misc.c:741
 #3 ssh_options_set at /usr/src/debug/libssh-0.7.3/src/options.c:559
 #4 virNetLibsshSessionSetHostKeyVerification at rpc/virnetlibsshsession.c:1176
 #5 virNetSocketNewConnectLibssh at rpc/virnetsocket.c:1090
 #6 virNetClientNewLibssh at rpc/virnetclient.c:618
 #7 doRemoteOpen at remote/remote_driver.c:985
 #8 remoteConnectOpen at remote/remote_driver.c:1328
 #9 virConnectOpenInternal at libvirt.c:1093