Re: bin/60275: sh(1): race condition in signal handling on background subshell fork

[Robert Elz <kre%munnari.OZ.AU@localhost>]

The change I just committed to src/bin/sh/trap.c (HEAD) seems
to fix the problem that you're having.   I believe it will
apply cleanly to -11 if you want to try it there (and is probably
simple enough for a pullup if desired).

It has been a long time since I looked at -10 (let alone -9) sh
sources, but even if it isn't clean there, it should be easy to
retrofit if desired - but for such an exotic issue, I'm not sure
it is really worth the effort.

kre