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QEMU s390x bug fix

I post this note to draw attention to a bug that I reported six weeks
ago in QEMU's emulation of IBM System/390 hardware:

	QEMU S/390x sqxbr (128-bit IEEE 754 square root) crashes qemu-system-s390x

A 2-character patch was quickly found by QEMU developers, but has been
disappointingly slow to make its way into various Linux distributions.

This bug can be triggered with a one-line user program that then
crashes the O/S, and the virtual machine, and that can also corrupt
assorted files on the systme, and write garbage into system logs.
Thus, I view it as a severe one whose repair should be quickly pushed
into O/S distributions.

- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe@math.utah.edu  -
- 155 S 1400 E RM 233                       beebe@acm.org  beebe@computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -

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