nodes, but most regularly on sparc64. (Occasionally, on amd64 and ia64).
For reasons I haven't been quite able to track down, on some occasions
a pkg_add command is unable to extract a dependency; the tarfile shows
up as being truncated. This does not seem to be due to disk-low or
memory-low conditions, nor is it a problem with scp; the md5 on the file
is fine when examined afterwards.
The only clue so far is that it seems to happen on systems with the most
package builds running simultaneously -- and thus, possibly more than one
pkg_add running in parallel.