Comment # 6 on bug 1151290 from Stefan Dirsch

Ok. Could be just coincidence that your CPU has this feature. 

Did setting the environment variable help? Could be a bit tricky having it set
for the Xserver start. 

And you probably don't want to set it for anything else. 

And you said the crashes don't happen immediately.

Meanwhile there is some environmental variable in glibc for detailed setting of
hle instead of turning it off, but I can't remember the name any longer and the
possible settings and meanings. 

In my case (audacity) it didn't help and I still need to use the noelison
libpthread library.