git: 6cd0117bdb2c - stable/14 - exit1(): Ensure that SIGCHLD from reparented child is queued to reaper

The branch stable/14 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=6cd0117bdb2c4b90cb31f90712431fbe125d9755

commit 6cd0117bdb2c4b90cb31f90712431fbe125d9755
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2025-06-08 07:31:28 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2025-06-12 04:28:27 +0000

    exit1(): Ensure that SIGCHLD from reparented child is queued to reaper
    
    (cherry picked from commit 8dda34d0ef79d0d247b3487ae0499bdf12c9209e)
---
 sys/kern/kern_sig.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index cc0aecbc7756..0291c2647da6 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -3751,7 +3751,14 @@ sigparent(struct proc *p, int reason, int status)
 		if (KSI_ONQ(p->p_ksi))
 			return;
 	}
-	pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
+
+	/*
+	 * Do not consume p_ksi if parent is zombie, since signal is
+	 * dropped immediately.  Instead, keep it since it might be
+	 * useful for reaper.
+	 */
+	if (p->p_pptr->p_state != PRS_ZOMBIE)
+		pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
 }
 
 static void