syscall: C strings can be garbage collected out from under the system call

[rsc]

CL https://golang.org/cl/139360044/ should be included in Go 1.3.2 if there is
one.
See discussion there.

To date, we know of no one encountering this in the wild, so this alone is not worth
issuing 1.3.2.

[rsc]

Comment 1:

This cannot happen in Go 1.3. The syscall.Syscall assembly wrappers have no argument
types, so the garbage collector scans those words conservatively.
Solaris does not use assembly to make system calls, which is why they alone have this
problem.

Status changed to Retracted.