id summary reporter owner description type status component version resolution keywords cc guest host 1046 Heavy NAT network usage crashing VBox (hash collision) => Fixed in SVN Gene "I'm running the latest VBOX 1.5.4 on Ubuntu 7.10 (Gutsy) 64-bit version. On a Quad Core Intel Q6600 processor. My guest OS is Win XP SP2 using NAT in the VBox Network Settings. When I do something VERY network intensive on the guest OS such as running a port scanner or proxy scanner for more than a few minutes, the Virtual Machine core dumps (aborts), and I get the following log: {{{ Log created: 2008-01-04T23:07:56.227929000Z Executable: /usr/lib/virtualbox/VirtualBox Arg[0]: /usr/lib/virtualbox/VirtualBox Arg[1]: -comment Arg[2]: WindowsXP Arg[3]: -startvm Arg[4]: f2981c30-2053-45bd-4b97-76e88f9367f9 !!Assertion Failed!! Expression: Location : /home/vbox/vbox-1.5/src/VBox/Devices/Network/slirp/tcp_subr.c(1341) VBoxU32PtrHashSlow NAT pointer hash error. pv=00002aaab036c890 cpvHashUsed=321 cpvHashCollisions=198 }}} " defect closed network VirtualBox 1.6.2 fixed network NAT abort crashing other other