Hyperthreading crashes

[Mikulas Patocka]

Hi

I use FreeBSD-4.9-RC1 on a machine with hyperthreading (it seems that
hyperthreading support was ripped out of final 4.9 release --- why?)

I get random SIGBUSes when compiling (once I got SIGSEGV too). When I
compile only with make -j 1, I get no errors. Is it known problem with
FreeBSD? Or does it mean that the machine is bad?

How can I find what's the reason for particular SIGBUS signal --- what did
the program wrong?

Mikulas