signal mask bug?

[Danek Duvall <duvall@xxxxxxxxxxxxxx>]

A co-worker of mine who's quite adept at finding the strangest bugs
discovered this:

    % sleep 30 | cat
    ^Z
    zsh: suspended  sleep 30 | cat
    % bg
    [1]  + continued  sleep 30 | cat
    % jobs
    [1]  + running    sleep 30 | 
           unknown signal (core dumped)                 cat

Of course, nothing actually dumped core, suggesting it's just a reporting
problem.

I see this on Solaris (5.0.7, 5.2, 5.3.1) and on Linux (5.0.2).

Danek