On Tue, May 02, 2017 at 10:31:41PM +0200, Karl Pettersson wrote: > On Mon, Apr 24, 2017 at 11:56:25AM -0700, Mike Larkin wrote: > > On Mon, Apr 24, 2017 at 11:50:07AM -0700, Mike Larkin wrote: > > > On Mon, Apr 24, 2017 at 08:18:17PM +0200, Karl Pettersson wrote: > > > > I run 64-bit Ubuntu as a vmm guest, according to: > > > > https://gist.github.com/reyk/6d369c5c0bd0c76f4906f83933f3bb71 > > > > > > > > It works well for the most part; I have removed cloud-init becaue I do > > > > not need it. However, I used Python 2.7 with numpy 1.12 (installed via > > > > Pip), > > > > and experienced crashes which seemed to be related to AVX2 > > > > instructions, even though the cpu should support this, according to > > > > /proc/cpuinfo. (cf. https://github.com/numpy/numpy/issues/8128). For > > > > example, when I tried to reproduce this simple chart, > > > > https://matplotlib.org/examples/lines_bars_and_markers/fill_demo.html, > > > > this made Python exit with illegal instruction, according to gdb: > > > > > > > > Program received signal SIGILL, Illegal instruction. 0x00007ffff3ce5d56 > > > > in UBYTE_less_equal_avx2 (args=0x7fffffffba50, dimensions=<optimized > > > > out>, steps=<optimized out>, __NPY_UNUSED_TAGGEDfunc=<optimized out>) at > > > > numpy/core/src/umath/loops.c.src:899 > > > > > > > > Downgrading to numpy 1.11.1~rc1 (the version available from as an Ubuntu > > > > package) seems to have fixed the issue. > > > > > > > > > > we filter out avx2 from the guest, for now. > > > > > > > actually after looking at this it appears we don't, and we should. the > > filter > > mask is only for avx (and not the later ones). I'll add suppression of avx2, > > that may force your software to downgrade to something we do allow. I'll > > commit > > that tonight. > > > > Was this commit ever made? I only find references to AVX in the CVS log > for vmm.c. >
Thanks for reminding me, I must have fatfingered 'd'elete on that email. I'll get to this tonight. -ml
