Today I found issue running DB2 10.1 under VMWare Fusion 6.0.2 on my MacBook - all management services for db2 are starting except for the db2 instance itself.
When I tried to start DB2 using db2start it just crashed without any additional information.
After some googling I found out that it is due to the fact that current version of DB2 can’t handle more than 4 responses to CPUID query.
The workaround is to update VMWare configuration file for the virtual machine.
monitor_control.enable_fullcpuid = TRUE
cpuid.4.4.eax = "0000:0000:0000:0000:0000:0000:0000:0000"
The answer was found on VMWare Community Forums