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

[kre%NetBSD.org@localhost]

Synopsis: sh(1): race condition in signal handling on background subshell fork

State-Changed-From-To: open->analyzed
State-Changed-By: kre%NetBSD.org@localhost
State-Changed-When: Sun, 17 May 2026 13:38:15 +0000
State-Changed-Why:
This turned out not to be what I thought it might be (or not exactly)
and considerably simpler to fix, once testing is done, I will commit
(assuming no problems arise of course).

I am going to leave this PR in analysed state though, while I look into
what is happening with those stray signal operations in the ktrace
output.   What I see happening in my debug are SIGTSTP and SIGTTOU
being reset in the child (but as those were never changed, here, as it
is not an interactive sh, no sys calls are needed to accomplish that).

More investigation required.