Comment 8 for bug 891369

Seems to be tied to the iscsitarget sysctl settings. These were previously fine, but something in the new kernel doesn't support the "net.ipv4.tcp_mem" property anymore.

Temporary fix is to comment that line out of the /etc/sysctl.d/30-iscsitarget.conf file (add a # at the beginning of line 7)

net.core.wmem_max=1048576
net.core.rmem_max=1048576
net.core.wmem_default=1048576
net.core.rmem_default=1048576
#net.ipv4.tcp_mem=1048576
net.ipv4.tcp_rmem=1048576
net.ipv4.tcp_wmem=1048576