Re: build error - missing linux/ltt-facilities.h

* Andy Howell ([email protected]) wrote:
> Mathieu Desnoyers wrote:
> 
> >Just unselect the stack dump menuconfig option under
> >Instrumentation/Probes. It's not ready yet. The rest should work better.
> >I'll make sure it at least compiles though. Thanks for reporting.
> 
> Mathieu,
> 
> 	Thanks, I got the kernel to build and boots ok. However when run:
> 
> lttctl -n trace -l /mnt/debugfs/ltt -t /tmp/trace
> 
> very bad things happen. Lots of processes are suddenly killed.
> 
> I have to reboot to get X working again. Any ideas?
> 
> Thanks,
> 
> 	Andy
> 

Yup. It seems to be caused to a race in the way x86_64 sysenter doesn't
handle thread flag changes between sysenter entry and exit correctly.

I'll try to come up with a fix.

Mathieu


-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68