Cannot execute this command without a live selected thread.

[Sandra Loosemore]

Yesterday I refreshed my build tree for testing some further nios2 
patches, and started seeing a whole lot of this in my test results:

(gdb) target remote qa8-centos32-cs:10514
Remote debugging using qa8-centos32-cs:10514
(gdb) set remote hardware-watchpoint-limit 1
(gdb) set mem inaccessible-by-default on
(gdb) load
Loading section .text, size 0x844 lma 0x10000000
Loading section .eh_frame, size 0x4 lma 0x10000844
Loading section .rodata, size 0x120 lma 0x10000848
Loading section .data, size 0x428 lma 0x10000968
Start address 0x10000040, load size 3472
Transfer rate: 41 KB/sec, 868 bytes/write.
(gdb) continue
Continuing.
Cannot execute this command without a live selected thread.
(gdb) ERROR: couldn't run to breakpoint

I think the checkout I used for testing the last nios2 patch I submitted 
was a couple weeks old.  Pedro, I see you checked in a batch of 
thread-related changes on Oct 15; do you have any clue what's going 
wrong here?  I can investigate further if it's not obvious, or somebody 
is not already working on this....

-Sandra