Reproducible hard reboot on make -j4

[Mathieu Malaterre <mathieu.malaterre@gmail.com>]

Hi,

  I am experiencing hard(soft?)-reboot every time I am doing parallel
compilation (eg. make -j4) on my laptop. I am starring at the log but
I do not see anything obvious. Does anyone knows how to prepare a good
bug report in this case ?

Thanks,
-- 
Mathieu